| The Stress/Strain Behavior of Aluminum Matrix Composites With Discontinuous Reinforcements. |
1991 |
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| Authors:
J. Yang; S. M. Pickard; C. Cady; A. G. Evans; R. Mehrabian; CALIFORNIA UNIV SANTA BARBARA
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 | The flow properties of a ductile al alloy reinforced with sic particulates and randomly oriented platelets have been investigated to establish trends with such variables as reinforcement volume fraction, size and aspect ratio. the experimental results are compared with the trends predicted by recent continuum calculations. the general agreement found between experiments and the calculations has established the following characteristic features of the flow strength. this strength is strongly influenced ... |
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| Toughening of MoSi2 With a Ductile (Niobium) Reinforcement. |
1991 |
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| Authors:
T. C. Lu; A. G. Evans; R. J. Hecht; R. Mehrabian; CALIFORNIA UNIV SANTA BARBARA DEPT OF MATERIALS
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| The effect of interfacial reactions and y2o3 coatings on toughening of mosi2 by ductile phase nb reinforcements has been investigated. in the absence of coating the interfacial reaction layer exhibits parabolic growth with mo5si3, (mo,nb)5si3, (nb,mo)5si3 and nb5si3 phases forming. in precracked laminates subjected to tensile loads the ductile phase deformation is partially constrained, with debonding occurring within the interfacial reaction zone. dense y2o3 coating inhibits interdiffusion and results in ... |
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| In-Situ-Grown Reinforcements for Titanium Aluminides. |
1991 |
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| Authors:
J. J. Valencia; J. P. A. Loefvander; C. G. Levi; R. Mehrabian; CALIFORNIA UNIV SANTA BARBARA
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| Refractory compounds grown from the melt offer significant potential for high temperature reinforcement of titanium aluminides. in principle, the strengthening arises from the constrained plastic flow of the matrix around the refractory second phases, which must be thermodynamically stable, have high aspect ratios and be of a scale larger than the dislocation cell size. the reinforcing phase morphology and size scale may be tailored by suitable control of the alloy ... |
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| Solidification Processing Routes to High Aspect Ratio Reinforcements in Gamma-TiAl. |
1990 |
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| Authors:
J. J. Valencia; J. P. A. Loefvander; J. Roesler; C. G. Levi; R. Mehrabian; CALIFORNIA UNIV SANTA BARBARA DEPT OF MATERIALS
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| Additions of ^5%b and ^9%ta to binary gamma-tial result in the formation of a monoboride isomorphous with tib but containing ta in solid solution. this boride exhibits strongly anisotropic growth from the melt, producing rod-like primary phases which are of potential interest for creep strengthening of the gamma matrix. fibrous borides with aspect ratios larger than ^20 and volume fractions of ^0.12 have been produced in arc-melted ti-48al-9ta-4.3b alloys. creep ... |
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| The High Temperature Behaviour of TiAl Containing Carbide Reinforcements. |
1990 |
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| Authors:
J. Roesler; J. J. Valencia; C. G. Levi; A. G. Evans; R. Mehrabian; CALIFORNIA UNIV SANTA BARBARA COLL OF ENGINEERING
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| The mechanical behavior of gamma-tial reinforced with ti2alc platelets is investigated in the temperature range between 293k and 1255k. comparison with the particle-free material of same matrix composition reveals a pronounced strengthening effect of the platelike reinforcements up to about 1000k. however, under creep loading the composite is remarkably weak. it is shown that this weakness is caused by diffusional creep along the particle/matrix interface. modelling of the process indicates ... |
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| Effects of Damage on the Flow Strength and Ductility of a Ductile Al Alloy Reinforced With SiC Particulates. |
1990 |
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| Authors:
J. Yang; C. Cady; M. S. Hu; F. Zok; R. Mehrabian; CALIFORNIA UNIV LOS ANGELES SCHOOL OF ENGINEERING AND APPLIED SCIENCE
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| The processing and mechanical properties of an al alloy reinforced with a high volume fraction of sic particulates have been investigated. the properties are shown to be appreciably affected by the particle size. these effects have been exclusively related to the incidence of damage caused by the particulates. in particular, particle cracking has been shown to occur in the larger particles, with a cracking probability that increases as the particle ... |
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| The Processing and Mechanical Behavior of an Aluminum Matrix Composite Reinforced With Short Fibers. |
1990 |
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| Authors:
Y. L. Klipfel; M. Y. He; R. M. McMeeking; A. G. Evans; R. Mehrabian; CALIFORNIA UNIV SANTA BARBARA DEPT OF MATERIALS
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| An aluminum alloy composite reinforced with chopped al2o3 fibers randomly oriented in a plane has been produced by a modified squeeze casting process and its mechanical behavior compared with the corresponding behavior of the matrix. the specific characteristics of the compositing process have been examined vis-a-vis the characteristics of liquid metal infiltration into the capillaries of the fiber bundle. the flow stresses in the as-cast composite have been correlated with ... |
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| MECHANICAL PROPERTIES OF PARTICULATE-REINFORCED ALUMINUM-MATRIX COMPOSITES. |
01 JAN 1989 |
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| Authors:
S. V. Kamat; J. P. Hirth; R. Mehrabian
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| Pergamon Press Ltd. : Great Britain |
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| Combined Mode I - Mode III Fracture Toughness of Alumina Particulate-Reinforced Aluminum Alloy-Matrix Composites. |
1989 |
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| Authors:
S. V. Kamat; J. P. Hirth; R. Mehrabian; WASHINGTON STATE UNIV PULLMAN DEPT OF MECHANICAL AND MATERIALS ENGINEERING
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| This paper concerned mmc in some important way and contained information about, utilized, or discussed these subjects: basic topics:, data, dr mmc, mmc, mmc data materials and material types:, (al2o3)p/al, al matrix, al2o3 particulates, al2o3/al, particulates material characteristics and data fields:, fracture toughness data, mode i, mode iii, stress intensity factors testing and test conditions:, fracture analysis, fracture toughness tests, sem, tensile tests manufacturing:, edm miscellaneous and special technical terms:, ... |
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| RAPID SOLIDIFICATION PROCESSING: PRINCIPLES AND TECHNOLOGIES, II; PROC. OF THE 2ND INT'L. CONF. ON RAPID SOLIDIFICATION PROCESSING, 3/23-26/80, RESTON, VA |
1980 |
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| Authors:
R. Mehrabian; B.H. KEAR; M. Cohen
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| THE GENERAL AIM OF THIS CONFERENCE WAS TO REVIEW CURRENT PRINCIPLES AND TECHNOLOGIES, WITH EMPHASIS ON RAPIDLY SOLIDIFIED CRYSTALLINE MATERIALS, AS OPPOSED TO AMORPHOUS SOLIDS, WHICH HAVE BEEN ADEQUATELY TREATED AT OTHER CONFERENCES. EVEN SO, SOME ATTENTION WAS GIVEN TO THE AMORPHOUS STATE AND ITS CONTROLLED THERMAL DECOMPOSITION AS A POSSIBLE ROUTE TOWARDS ATTAINING UNIQUE CRYSTALLINE STRUCTURES. |
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| Metal-Matrix Composites. |
1978 |
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| Authors:
C. G. Levi; G. J. Abbaschian; R. Mehrabian; ILLINOIS UNIV AT URBANA-CHAMPAIGN SAVOY AVIATION RESEARCH LAB
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| Metal matrix composites containing particulate and fibrous nonmetals can be prepared by introduction of the nonmetals into rheocast slurries of aluminum alloys regardless of wetting. it is postulated that continuous agitation of the slurry brings the metal in direct contact with the nonmetal surface to permit bonding. interface reactions between aluminum alloys containing magnesium and high-strength, high-modulus, al2o3 fp fibers have been studied. a variety of other aluminum matrix composites ... |
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| PREPARATION AND CASTING OF METAL-PARTICULATE NON-METAL COMPOSITES. |
1974 |
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| Authors:
R. Mehrabian; R. G. Riek; M. C. Flemings
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| Minerals, Metals and Materials Society : Warrendale, Pennsylvania Pennsylvania |
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| Investigation of Solidification of High Strength Steel |
AUG 1972 |
83 pages |
| Authors:
D. S. Gnanamuthu; M. Basaran; T. Z. Kattamis; R. Mehrabian; M. C. Flemings; MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF METALLURGY AND MATERIALS SCIENCE
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 | Solidification of High Strength Steel. Technical rept. 1 Jan-31 Dec 1971, Gnanamuthu,D. S. ;Basaran,M. ;Kattamis,T. Z. ;Mehrabian,R. ;Flemings,M. C. ;DAAG46-68-C-0043DA-1-T-062105-A-328AMMRCCTR-72-6/1(*steel, *casting), hot pressing, castings, heat treatment, defects(materials), porosity, impurities, sulfides, iron*high strength alloys, *steel, homogenizing, steel 4340, thermomechanicsThe first part of the work describes the effect of homogenizaton, of unidirectionally solidified AISI 4340 low alloy steel, under high isostatic pressure (in excess of 20,000 psi) on volume percent and geometry ... |
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