| C-Ring Strength of Advanced Monolithic Ceramics |
2003 |
9 pages |
| Authors:
A. A. Wereszczak; R. J. Caspe; J. J. Swab; S. F. Duffy; E. H. Baker; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
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 | Alumina, silicon carbide, silicon nitride, and zirconia are common candidate ceramics for load-bearing tubular components. To help facilitate design and reliability modeling with each ceramic, Weibull strength distributions were determined with each material using a diametrally compressed c-ring specimen in accordance with ASTM C1323. The investigated silicon nitride and zirconia were found to exhibit higher uncensored characteristic strengths than the alumina and silicon carbide. The occurrence of chamber-located fracture initiation ... |
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| Phase Stability, Point Defects and Site Preference of FeAl and NiAl With Ternary Additions |
1995 |
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| Authors:
C. L. Fu; J. Zou; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
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| The Effect of Grain Refinement on the Room-Temperature Ductility of AS- Cast Fe3Al-Based Alloys |
1995 |
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| Authors:
S. Viswanathan; V. K. Andleigh; C. G. McKamey; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
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| Effect of Heat Treatment at 1150 Degrees C on Creep-Rupture Properties of a Fe3Al-Based Alloy |
1995 |
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| Authors:
C. G. McKamey; Y. Marrero-Santos; P. J. Maziasz; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
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| Review of Environmental Effects in Intermetallics |
1995 |
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| Authors:
E. P. George; C. T. Liu; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
|
 | This paper concerned metals in some important way and contained information about, utilized, or discussed these subjects: basic topics: review materials and material types: feal, ni3al materials related terms: beryllium addition, cobalt addition, copper addition, crack growth, crack tip, ductile- brittle transition temp, ductility, elongation, embrittlement, fracture toughness, grain boundary, hafnium addition, intergranular fracture, iron addition, manganese addition, microcracking, palladium addition, platinum addition, polycrystalline, recrystallization, silver addition, single crystal, solid ... |
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| Environmental Embrittlement and Other Causes of Brittle Grain Boundary Fracture in Ni3Al |
1995 |
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| Authors:
E. P. George; C. T. Liu; H. Lin; D. P. Pope; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
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| This paper concerned metals in some important way and contained information about, utilized, or discussed these subjects: basic topics: literature review materials and material types: ni-23al, ni3al materials related terms: aluminum addition, auger analysis, beryllium addition, boron addition, brittle fracture, brittle-ductile transition temp(see ductile-brittle transition temp), cobalt addition, copper addition, ductility, elongation, embrittlement, grain boundary, grain size, hafnium addition, intergranular fracture, intermetallic containing alloys, iron addition, manganese addition, palladium addition, ... |
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| Thermal Shock Behavior of Fiber-Reinforced Composites, |
1995 |
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| Authors:
Hongyu Wang; Raj N. Singh; Stephen C. Beecher; Ralph B. Dinwiddie; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
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| The thermal shock behavior of three types of continuous fiber-reinforced ceramic composites (Nextel) or Nicalon fiber-reinforced chemical vapor infiltrated or polymer-derived SiC matrix composites) was studied using the water quench technique. The thermal shock induced damage was characterized by both destructive and nondestructive techniques. As compared with monolithic ceramics, the continuous fiber-reinforced ceramic composites were capable of preventing catastrophic failure caused by thermal shock and were able to retain a ... |
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| A Modified Analysis for Stress Transfer in Fibre-Reinforced Composites With Bonded Fibre Ends. |
1995 |
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| Authors:
Chun-Hway Hsueh; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
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| The elastic stress transfer from the matrix to the embedded fiber-reinforced composites has been analysed previously when the loading direction is parallel to the fiber axis and the fiber is bonded to the matrix. stress transfer occurs both at the interface along the fiber length and at the ends of the fiber. however, the boundary condition at the bonded ends is ambiguous, and various assumptions have been made to obtain ... |
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| Crack-Tip Dislocations and Fracture Behavior in Ni3Al and Ni3Si |
1994 |
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| Authors:
M. H. Yoo; C. L. Fu; J. A. Horton; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
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| The ideal griffith energies and the critical stress intensity factors for three cleavage modes are determined from the calculated elastic constants and surface energies. the propensity for crack tip deformation is estimated on the basis of the calculated antiphase boundary (apb), complex stacking fault and superlattice intrinsic stacking fault energies and the anisotropic coupling effect on dislocation mobility, i.e. non-schmid effects. it is shown that while the calculated griffith energy ... |
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| Ordered Intermetallics |
1994 |
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| Authors:
E. P. George; M. Yamaguchi; K. S. Kumar; C. T. Liu; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
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| This paper concerned metals in some important way and contained information about, utilized, or discussed these subjects: basic topics: literature review(see also overview) materials and material types: fe-37 at. pct al, nb-18 at. pct al, nb-20 at. pct al-10 at. pct ti, ti-46 at. pct al-2 at. pct nb, ti-48 at. pct al, ti-48 at. pct al-2 at. pct nb-2 at. pct cr, inconel 713c, materials related terms: aluminum addition, ... |
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| Tensile and Impact Properties of Iron-Aluminum Alloys |
1994 |
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| Authors:
D. J. Alexander; V. K. Sikka; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
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| This paper concerned metals in some important way and contained information about, utilized, or discussed these subjects: basic topics: experimental materials and material types: fe-16al-5cr-1nb, fe-8al-5cr-2mo-1ti , fe3al, fa129 materials related terms: aluminum addition, brittle-plastic transition, carbon addition, chromium addition, elongation, equiaxed grain, grain size, grain structure, microvoid coalescence, niobium addition, sem, tensile strength, titanium addition, ultimate tensile strength, yttrium addition, zirconium addition parameter values relevant to the data: temp ... |
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| Slow Crack Growth in Ternary B2 Iron Aluminides at Room Temperature |
1994 |
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| Authors:
J. H. Schneibel; E. D. Specht; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
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| This paper concerned metals in some important way and contained information about, utilized, or discussed these subjects: basic topics: experimental materials and material types: al-45 at. pct cr-5 at. pct fe, al-45 at. pct mn-5 at. pct fe, al-45 at. pct ni-5 at. pct fe materials related terms: aluminum addition, chromium addition, crack growth rate, embrittlement, environmental effects, grain size, intergranular fracture, manganese addition, modulus of elasticity, nickel addition, sem, ... |
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| The Effect of Irradiation on the Mechanical Properties of 6061-T651 Aluminum |
1994 |
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| Authors:
David J. Alexander; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
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| Effect of Heat Treatment Temperature on Creep-Rupture Properties of Fe3Al-Based Alloys |
1994 |
|
| Authors:
C. G. McKamey; P. J. Maziasz; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
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| This paper concerned metals in some important way and contained information about, utilized, or discussed these subjects: basic topics: experimental materials and material types: fe-28 at. pct al-1 at. pct mo, fe3al, fa 180 materials related terms: aluminum addition, analytical electron spectroscopy, boron addition, carbide precipitation, carbon addition, creep rupture, ductile fracture, equiaxed grain, grain boundary pinning, grain boundary precipitation, grain size, molybdenum addition, niobium addition, optical metallography, optical microscopy, ... |
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| Comparison of the Creep and Creep Rupture Performance of Two HIPed Silicon Nitride Ceramics |
94 |
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| Authors:
Mattison K. Ferber; Michael G. Jenkins; Theodore A. Nolan; Russell L. Yeckley; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
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| Measurements of the tensile creep and creep rupture behavior were used to evaluate the long-term mechanical reliability of a commercially available and a developmental hot isostatically pressed (HIPed) silicon nitride. Measurements were conducted at 1260 and 1370 C utilizing button-head tensile specimens. The stress and temperature sensitivities of the secondary creep rates were used to estimate the stress exponent and activation energy associated with the dominant creep mechanism. The stress ... |
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| Effect of Relative Humidity on Repetitive Impact Behavior of Machined Silicon Nitride |
94 |
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| Authors:
Sreeram R. Srinivasan; Peter J. Blau; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
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| Silicon nitride is a promising candidate material to replace metallic valves in internal combustion engines. Its attractive mechanical properties relative to conventional alloys are expected to lead to reduced valve wear. As valves operate under combined conditions of impact and sliding contact, the durability of Si3N4 under a repetitive 45 degree impact was studied to assess the performance of these materials as valves. A significant effect of relative humidity on ... |
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| Creep and Creep Rupture of an Advanced Silicon Nitride Ceramic |
94 |
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| Authors:
Jow-Lian Ding; Kenneth C. Liu; Karren L. More; C. R. Brinkman; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
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| Creep and creep rupture behavior of an advanced silicon nitride ceramic were systematically characterized in the temperature range 1150 to 1300 C using uniaxial tensile creep tests. Absence of tertiary creep and the order- of-magnitude breaks in both creep rate and rupture lifetime at certain threshold combinations of stress and temperature were two characteristic features of the creep behavior observed. Thermal annealing was found to have enhanced both subsequent creep ... |
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| Grain Growth Kinetics in Alumina-Zirconia (CeZTA) Composites |
94 |
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| Authors:
Kathleen B. Alexander; Paul F. Becher; Shirley B. Waters; Alan Bleier; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
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| Grain growth kinetics in alumina-rich, zirconia-alumina composites have been examined as a function of volume fraction of zirconia. Both the microstructural scale and character alter during grain growth. Grain growth exponents between n = 3 and 4 were observed and have been rationalized in terms of current models for grain growth and particle coarsening. Grain growth constants were measured and compared with available data. Coupled grain growth was observed in ... |
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| Neutron Diffraction Measurements of the Residual Stresses in Al2O3-ZrO2 (CeO2) Ceramic Composites |
94 |
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| Authors:
Xun-Li Wang; Camden R. Hubbard; Kathleen B. Aleander; Paul F. Becher; Jaime A. Fernandez-Baca; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
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| High-resolution neutron powder diffraction was used to study the residual stresses in Al2O3-ZrO2 (12 mol% CeO2) ceramic composites containing 10, 20, and 40 vol% ZrO2 (CeO2). The diffraction data were analyzed using the Rietveld structure refinement technique. The analysis shows that for all samples, the CeO2 stabilized tetragonal ZrO2 particles are in tension and the Al2O3 matrix is in compression. For both ZrO2 particles and the Al2O3 matrix, the average ... |
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| The Effect of Fiber Coating Thickness on the Interfacial Properties of a Continuous Fiber Ceramic Matrix Composite. |
1994 |
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| Authors:
Edgar Lara-Curzio; Mattison K. Ferber; Richard A. Lowden; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
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| The interfacial properties (coefficient of friction, residual clamping stress, residual axial stress, and debond stress) of a continuous fiber ceramic composite were determined by means of single-fiber push-out tests. The composite consisted of Nicalon fibers, that had been coated prior to matrix infiltration with carbon layers ranging in thickness from 0.03 to 1.2 micrometers, and a CVI SiC matrix. It was found that the effective interfacial frictional stress decreased as ... |
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| Cyclic Fatigue of Hot Isostatically Pressed Silicon Nitride at Elevated Temperatures. |
1994 |
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| Authors:
C. K. J. Lin; M. G. Jenkins; M. K. Ferber; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
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| Cyclic fatigue properties of hot isostatically pressed silicon nitride were investigated at 1150, 1260 and 1370 C in ambient air. The uniaxial tensile tests were conducted under various cyclic loading wave forms and frequencies. The correlation of stress-life relations between cyclic and static fatigue results was evaluated. At 1150-1370 C, cyclic loading caused less damage than static loading, as evidenced by the longer failure time under cyclic loading versus static ... |
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| Theoretical and Experimental Studies of Fiber Pull-Out of SiC Fiber-Reinforced Glasses. |
1994 |
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| Authors:
C. H. Hsueh; H. Tsuda; M. Enoki; T. Kishi; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
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| Single fiber pull-out in a SiC fiber-reinforced glass system is characterized from both theoretical analyses and experimental studies. The stress-displacement relationship of the fiber during the fiber pull-out process (i.e., the fiber pull-out curve) is analyzed. Consideration of the displacement due to the compliance of the apparatus is essential in comparing the theoretical fiber pull-out curve with the experimental fiber pull-out curve, in which the displacement between the platform and ... |
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| Methodologies for the Thermomechanical Characterization of Continuous-Fiber Ceramic Matrix Composites: A Review of Test Methods. |
1994 |
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| Authors:
Edgar Lara-Curzio; Mattison K. Ferber; Michael G. Jenkins; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
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| The requirements for the thermomechanical characterization of ceramic matrix composite materials are reviewed. The feasibility of adapting existent room temperature test methods for polymer and metal matrix composites to test ceramic matrix composites at room and elevated temperatures is investigated. |
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| Chemical Vapor Infiltration of TiB2-Matrix Composites. |
1994 |
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| Authors:
Theodore M. Besmann; James H. Miller; Kevin M. Cooley; Richard A. Lowden; Thomas L. Starr; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
|
| The efficiency of the HAll-Heroult electrolytic reduction of aluminum can be substantially improved by the use of a TiB2 cathode. The use of TiB2 components, however, has been hampered by the brittle nature of the material and the grain boundary attack of sintering-aid phases by molten aluminum. In the current work, TiB2 is toughened through the use of reinforcing fibers, with chemical vapor infiltration used to produce the TiB2 matrix. ... |
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| An Asymptotic Approach for Debonding at the Fiber-Matrix Interface. |
1994 |
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| Authors:
Chun-Hway Hsueh; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
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| The debond stress at the fiber-matrix interface based on the critical energy release rate criterion has been analyzed previously by using both simple and rigorous approaches. Only the rigorous approach can yield the dependences of the debond stress on all the essential material properties and dimensions. However, the analytical procedures in deriving a rigorous solution are complicated, and the trends of these dependences cannot be readily visualized from the lengthy ... |
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| Effects of Alloying Additions on the Microstructures, Mechanical Properties and Weldability of Fe3Al-Based Alloys. |
1994 |
|
| Authors:
C. G. McKamey; P. J. Maziasz; G. M. Goodwin; T. Zacharia; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
|
| Several alloys based on the Fe-28Al-5Cr (atomic per cent) composition were produced to study the effects of alloying with Mo, Nb, Zr, B and C on microstructures, mechanical properties, and weldability. Optical microstructures were examined before and after heat treatments of 1 h at 750 C, as well as after selected higher temperature anneals. Tensile properties at room temperature and 600 C and creep-rupture properties at 593 C and 207 ... |
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| Fracture Strength-Fracture Resistance Response and Damage Resistance of Sintered Al2O3-ZrO2 (12 Molecular Percent CeO2) Composites. |
1994 |
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| Authors:
Paul F. Becher; Wilbur H. Warwick; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
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| The fracture strengths of sintered Al2O3 containing 20 and 40 vol% ZrO2(12 mol% CeO2) - zirconia-toughened alumina (ZTA) -composites along with the fracture resistance can be increased (e.g., to approximately 900 MPa and greater than 12 MPa sq rt m, respectively), by increasing the mean grain size of the t-ZrO2 (and the Al2O3) from approximately 0.5 microns to approximately 3 microns. At these lower t-ZrO2 contents, the fracture strength-fracture resistance ... |
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| Improvement of Tensile Creep Displacement Measurements. |
1994 |
|
| Authors:
Hua-Tay Lin; Paul F. Becher; Mattison K. Ferber; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
|
| A water-cooled copper shield is shown to minimize local temperature variations (hence, regulate the refractive index of the air) in the optical path traversed by a laser beam used to measure creep displacements in a tensile specimen. Both the scatter and the reliability of the elevated-temperature tensile creep displacement measurements have been significantly improved from +/- 5 to +/- 0.5 microns, which is comparable to that obtained at room temperature. ... |
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| Effect of Vacuum on Room-Temperature Ductility of Ni3Al. |
1994 |
|
| Authors:
E. P. George; C. T. Liu; D. P. Pope; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
|
| Ni3Al was processed by cold rolling and recrystallization, and specimens were tested under ultra high vacuum conditions. A room temperature tensile ductility of 23.4% was obtained. It was found that the ductility decreases as the amount of air in the test environment is increased. Moisture in air was determined to be responsible for embrittlement. |
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| Oxidation Effects on Nextel(TM)-Reinforced SiC. |
1994 |
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| Authors:
P. F. Tortorelli; c. A. Wijayawardhana; L. Riester; R. A. Lowden; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
|
| The oxidation reactions associated with air exposures of Nextel reinforced SiC composites with carbon and BN fiber coatings (interphases) were studied by thermogravimetric analysis. For those with carbon interphases, the shapes of the thermogravimetric curves could be explained on the basis of concurrent reactions associated with oxidation of the carbon and the formation of SiO2. The use of BN fiber coatings improved oxidation resistance because there was no weight loss ... |
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| Intergranular Fracture Tendency in NiAl Doped With Boron and Carbon. |
1994 |
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| Authors:
C. T. Liu; E. H. Lee; E. P. George; A. J. Duncan; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
|
| This paper presents a study of intergranular fracture in NiAl doped with boron and carbon. Room temperature compression tests were carried out at a strain rate of 3.3 x 10(-3)/s. Boron segregation was found to enhance grain boundary cohesion and reduce intergranular fracture. Also, poor grain boundary cohesion was found to be a major cause of brittle intergranular fracture. |
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| An Asymptotic Approach for Debonding at the Fiber-Matrix Interface. |
1994 |
|
| Authors:
Chun-Hway Hsueh; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
|
| The debond stress at the fiber-matrix interface based on the critical energy release rate criterion has been analyzed previously by using both simple and rigorous approaches. only the rigorous approach can yield the dependences of the debond stress on all the essential material properties and dimensions. however, the analytical procedures in deriving a rigorous solution are complicated, and the trends of these dependences cannot be readily visualized from the lengthy ... |
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| Development of Ultralight Electromagnetic Interference Shielding Materials. |
1994 |
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| Authors:
David P. Stinton; James R. Weir; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
|
| Computers have prompted mankind to increasingly rely on electronic systems. unfortunately, these electronic control systems can be confused or rendered inoperable by unwanted electromagnetic interference (emi), and, hence, electromagnetic shielding requirements are becoming more important. in applications such as stationary, land-based systems, where weight requirements are not stringent, metal enclosures can be employed for emi shielding. however, in the case of automobiles, home appliances, computers, aircraft, and spacecraft, emi shielding ... |
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| Processing and Mechanical Properties of Laminar Al2O3-Ni3Al Composites. |
1994 |
|
| Authors:
H. Schneibel; K. B. Alexander; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
|
| This paper concerned mmc in some important way and contained information about, utilized, or discussed these subjects: materials and material types:, al2o3 ceramics, al2o3/ni3al, al2o3/nial, laminates, ni3al matrix material characteristics and data fields:, mechanical properties, thickness testing and test conditions:, 3 point bend tests, chevron specimens, fractography (see also fracture analysis), fracture analysis, load distribution analysis manufacturing:, hot pressing, wettings miscellaneous and special technical terms:, de-ac05-84or21400 contracts, doe, notches, series ... |
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| A Two-Dimensional Stress Transfer Model for Platelet Reinforcement. |
1994 |
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| Authors:
Chun-Hway Hsueh; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
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| Stress transfer in platelet-reinforced composites is analyzed by using a two-dimensional model. the plane of the platelet is bonded to the matrix and is parallel to the loading direction. the ends of the platelet can be debonded from or bonded to the matrix, and both cases are considered in the present analysis. for the debonded ends, which are stress free, the boundary condition in solving the stress transfer problem is ... |
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| Phonon Scattering by Neutral Donors in n-Type Silicon. |
1994 |
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| Authors:
D. P. White; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
|
| The scattering of phonons by neutral n-type impurities in silicon is studied. Following Keyes, who determined the phonon relaxation time for scattering by neutral impurities in n-type germanium, the relaxation time for the silicon band structure is developed. This scattering comes about due to the large effect of strain on the hydrogen-like donor ground-state energy level. The change in energy of the ground state due to the strain caused by ... |
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| Slow Crack Growth at Room Temperature in FeAl |
93 |
|
| Authors:
J. H. Schneibel; M. G. Jenkins; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
|
| An investigation was conducted on slow crack growth in Fe-40 at% Al alloy at room temperature. Three point bend tests were performed in ambient air on extruded and annealed specimens with chevron notches. Stress intensity factor reached a threshold value near 17 MPa m(1/2) at slow crack propagation rates of 0.1 micron/s, while at 300 microns/s the value was approximately 40MPa (1/2). The results are consistent with the sensitivity of ... |
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| Intrinsic Ductility and Environmental Embrittlement of Binary Ni3Al |
93 |
|
| Authors:
E. P. George; C. T. Liu; D. P. Pope; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
|
| Environmental embrittlement and ductility have been investigated in Ni3Al. Results of tensile tests at room temperature show that the intrinsic ductility of Ni3Al is quite high, but not as high as that of Zr-doped Ni3Al. The results also show that Ni3Al is susceptible to severe environmental embrittlement. |
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| Environmental Embrittlement of Binary and Zr-Doped Ni3Al |
93 |
|
| Authors:
E. P. George; C. T. Liu; D. P. Pope; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
|
| This paper summarizes results of our recent work on moisture-induced environmental embrittlement in single crystals of B-free Ni3Al, cold rolled and recrystallized to produce crack-free polycrystalline material. Results show that the intrinsic ductility (about 16%) of Ni3Al(23.4 at% Al) is considerably higher than previously thought; however, it is severely embrittled by moisture in air. Since B-doped Ni3Al does not show such embrittlement, we conclude that a significant part of the ... |
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| Measurement of the Critical Level of Moisture for Initiation of Water- Vapor-Induced Environmental Embrittlement in an Fe3Al-Based Alloy |
93 |
|
| Authors:
C. G. McKamey; E. H. Lee; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
|
| Iron aluminides based on Fe3Al are of interest as structural materials because of their excellent corrosion resistance in many environments; however, studies have shown that one of the major causes of low room temperature tensile ductility, which so far has limited the use of these alloys, is an environmental reaction involving aluminum in the presence of water vapor; during this reaction, atomic hydrogen is released, moves into the sample ahead ... |
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| Ordered Intermetallic Alloys, Part I: Nickel and Iron Aluminides |
93 |
|
| Authors:
C. T. Liu; K. S. Kumar; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
|
| An overview of nickel and iron aluminides is presented. Mechanical properties, fatigue behavior, corrosion and environmental effects in Ni3Al, NiAl, Fe3Al and FeAl are discussed. |
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| Effects of Multiple Ion Implantation on Creep of Fe-13Cr-15Ni Alloys |
93 |
|
| Authors:
G. R. Rao; K. Farrell; E. H. Lee; M. B. Lewis; L. K. Mansur; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
|
| Creep behavior at 873 K has been investigated in Fe-13Cr-15Ni (B1 alloy) and Fe-13Cr-15Ni-2Mo-2Mn-0.2Ti-0.8Si-0.06C (E1 alloy) subjected to multiple ion implantation with boron and nitrogen, or single implantation with argon. Results indicate an improvement in the overall creep life of the alloys with the simultaneous boron and nitrogen implantation. Ductility increased in the B1 alloy, whereas it decreased in the E1 alloy. The argon implantation increased creep life of B1 ... |
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| Mechanical Properties of Ductile Fe3Al-Based Plates |
93 |
|
| Authors:
B. G. Gieseke; D. J. Alexander; V. K. Sikka; R. H. Baldwin; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
|
| An investigation was conducted on the tensile, creep and fatigue properties of ductile Fe3Al plate in two thickness and compared to those of a sheet material. Results show the differences in mechanical properties for plate and sheet products. The relationship between high-cycle fatigue failure and temperature, and the plate thickness was also studied. |
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| Advanced HIP Processing for Aerospace PM Parts |
93 |
|
| Authors:
F. X. Zimmerman; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
|
| The Powder Metallurgy (P/M) process has been successfully applied the last 25 years for both military and commercial aero-engines using Nickel-base superalloys for the manufacture of critical rotating components. These rotating components are heavily stressed and their useful life is affected by the presence of small defects. Such defects can act as crack initiators under Low Cycle Fatigue (LCF) loading. Inclusions such as nonmetallic oxides and porosity, like Thermal Induced ... |
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| Effect of Thermomechanical Processing on the Room-Temperature Tensile Properties of an Fe3Al-Based Alloy |
1993 |
|
| Authors:
S. Viswanathan; B. R. Shelton; J. K. Wright; V. K. Sikka; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
|
| The tensile properties of fa-129, an fe(sub 3)al-based alloy, have been investigated at room temperature. the alloy was subjected to thermomechanical treatment (tmt). results indicate the temperature of tmt has a significant effect on the ductility. to maximize the room- temperature ductility of fe(sub 3)al-based alloys, a processing temperature of 500-700 c is recommended. |
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| Thermal Expansion Data on Several Iron- and Nickel-Aluminide Alloys |
1993 |
|
| Authors:
W. D. Porter; P. J. Maziasz; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
|
| An investigation of the thermal expansion of fa-129 (fe(sub 3)al), fa-385 (feal) and 1c-22m (ni(sub 3)al) aluminide alloys was conducted in the temperature range 20-1300 c. the data of the iron aluminides were compared with those of the type 316 stainless steel, and the data of the nickel aluminides were compared with those of in713c. feal showed slightly more expansion than the fe3al. the thermal expansion of ni(sub 3)al was ... |
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| The Effect of Aging at 343 Degrees C on the Mechanical Properties and Microstructure of Type 308 Stainless Steel Weldments |
1993 |
|
| Authors:
D. J. Alexander; K. B. Alexander; M. K. Miller; R. K. Nanstad; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
|
| This paper concerned metals in some important way and contained information about, utilized, or discussed these subjects: basic topics: experimental materials and material types: aisi 308 materials related terms: atom probe field ion microscopy, chromium addition, ferrite, fractography, impact toughness, manganese addition, metallography, microcracking, micrography, morphology, nickel addition, optical microscopy, sem, shelf energy, tem, tensile yield strength, transition temperature, ultimate tensile strength, weld metal, weldment, welds parameter values relevant to ... |
|
| The Effect of Long-Term Aging on the Impact Properties of Modified 9Cr- 1Mo Steel |
1993 |
|
| Authors:
D. J. Alexander; P. J. Maziasz; C. R. Brinkman; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
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| This paper concerned metals in some important way and contained information about, utilized, or discussed these subjects: materials and material types: 9cr-1mo steel materials related terms: brittle-ductile transition temp(see ductile-brittle transition temp), chromium addition, fractography, impact strength, molybdenum addition, morphology, shelf energy, silicon addition, softening, temperature, tensile yield strength, transition temperature, ultimate tensile strength parameter values relevant to the data: temp 0 to 99 c testing and test conditions: charpy ... |
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| Properties of Zirconia-Ceria-Hafnia Alloys |
93 |
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| Authors:
Eric F. Funkenbusch; Ross H. Plovnick; Paul E. Becher; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
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| Tetragonal zirconia alloys containing up to 18 mol% ceria and 30 mol% hafnia were prepared by several wet-chemical techniques, sintered to high density, and their microstructural and physical properties studied. Toughening in such alloys depends on the retention of the metastable tetragonal phase and the stress required for its transformation to the monoclinic phase. The degree of metastability of the tetragonal phase in these ternary zirconia alloys was a function ... |
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| Influence of Fiber Coatings on the Oxidation of Fiber-Reinforced SiC composites |
93 |
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| Authors:
P. F. Tortorelli; S. Nijhawan; L. Riester; R. A. Lowden; OAK RIDGE NATIONAL LAB TN METALS AND CERAMICS DIV
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