| Effect of Initial Temper on the Mechanical Properties of Friction Stir Welded Al-2024 Alloy (Preprint) |
SEP 2006 |
19 pages |
| Authors:
V. Dixit; R. S. Mishra; R. J. Lederich; R. Talwar; MISSOURI UNIV-ROLLA DEPT OF MATERIALS SCIENCE AND ENGINEERING
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 | The microstructural evolution and resultant mechanical properties during friction stir welding (FSW) of precipitation strengthened aluminum alloys depend on initial temper as well as FSW process parameters. Al-2024 alloy under two different initial tempers, T3 and T8, was used in this study. FSW bead-on-plate runs were performed at different values of process parameters (tool rotation rate and tool traverse speed). Microstructure and mechanical properties of the nugget region and heat ... |
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| AN INVESTIGATION OF DUCTILE AND BRITTLE REINFORCEMENT ON THE FRACTURE BEHAVIOR OF MOLYBDENUM DISILICIDE COMPOSITES. |
01 JAN 1994 |
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| Authors:
D. Brooks; R. J. Lederich; W. O. Soboyejo
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 | Proceedings of a Symposium on Fatigue and Fracture of Ordered Intermetallic Materials I; Held Oct 1993, Pittsburgh, Pennsylvania; Edited by W. O. Soboyejo, T. S. Srivatsan and D. L. Davidson; Minerals, Metals and Materials Society : Warrendale, Pennsylvania |
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| Strength and Toughness Improvement of Silicide Intermetallics by Nanophase and Microphase Reinforcements. |
1993 |
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| Authors:
D. S. Schwartz; R. J. Lederich; D. A. Deuser; S. M. Sastry; R. Suryanarayanan; MCDONNELL DOUGLAS AEROSPACE ST LOUIS MO
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| The hip processing of mosi2 and mosi2-nb powder, nb wire, and nb foil composites was optimized. the reaction between mosi2 and mo, w, ta, and nb, reinforcements at 1700 c was examined. w, ta, and nb, reinforcements formed complex, two layer reaction zones in contact with mosi2. reaction layer growth parameters were measured for nbv. detailed hip modeling and deformation mechanism mapping was carried out for mosi2, mosi2+nb, and mosi2 ... |
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| Effects of Microstructure on the Creep Behavior of Alpha2-Based Titanium Aluminide Alloys. |
1991 |
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| Authors:
W. O. Soboyejo; R. J. Lederich; D. S. Schwartz; MCDONNELL DOUGLAS RESEARCH LABS ST LOUIS MO
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| The effects of microstructure and substructure on the secondary creep behavior of Ti-24Al-11Nb and Ti-25Al-10Nb-3V-1Mo were examined. The effects of heat treatments on the creep deformation and tensile properties were investigated from 540-760 C, and the secondary creep controlling parameters were identified. |
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| Recent Developments in Multiphase Metallic Materials, |
SEP 1988 |
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| Authors:
S.M.L. Sastry; R. J. Lederich; T. C. Peng
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| This paper briefly reviews some recent developments in multiphase metallic materials with a specific emphasis on how fundamental metallurgical understanding has guided the development of materials with tailored microstructures and useful mechanical properties. |
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| RECENT DEVELOPMENTS IN MULTIPHASE METALLIC MATERIALS. |
01 JAN 1988 |
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| Authors:
Shankar M. L. Sastry; R. J. Lederich; T. C. Peng
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| Minerals, Metals and Materials Society : Warrendale, Pennsylvania Pennsylvania |
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| Study on Effects of Powder and Flake Chemistry and Morphology on the Properties of Al-Cu-Mg-X-X-X Powder Metallurgy Advanced Aluminum Alloys, |
NOV 1985 |
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| Authors:
P. J. Meschter; R. J. Lederich; J. E. O'Neal; P. S. Pao; MCDONNELL DOUGLAS RESEARCH LABS ST LOUIS MO
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| A study was conducted to determine the effects of alloy chemistry and particulate morphology on consolidation behavior and consolidated product properties in rapid solidification processed, powder-metallurgical Al-3Li-1.5Cu-1Mg-0.5Co-0.2Zr and Al-4.4Cu-1.5Mg-Fe-Ni-0.2Zr extrusions and forgings. Mechanical properties of extrusions were superior to those of forgings owing to the stronger textures produced by the more severe hot working during extrusion. The effects on mechanical properties of dispersoid size and volume fraction, substructural refinement, solid ... |
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| Rapid Solidification and P/M Processing of Aluminum-Lithium Alloys, |
1985 |
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| Authors:
P. J. Meschter; R. J. Lederich; J. E. O'Neal; MCDONNELL DOUGLAS RESEARCH LABS ST LOUIS MO
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| Al-3Li (wt.%) alloys were produced by vacuum atomization. In addition to the binary composition, ternary alloys were formed containing 0.2Zr and 0.5Zr, and quaternary alloys were formed containing 1 or 2 percent Mg or Cu, and 0.2Zr. Two additional quaternary alloys containing 2Cu also contained 0.5Zr or 0.5Co. After extrusion the alloys were solution heat treated and aged, with some being stretched, prior to tensile testing. Tensile properties are displayed ... |
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| INFLUENCE OF ERBIUM AND YTTRIUM ADDITIONS ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF TITANIUM ALLOYS. |
1980 |
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| Authors:
B. B. Rath; B. A. MacDonald; S. M. L. Sastry; R. J. Lederich; J. E. O'Neal; MCDONNELL DOUGLAS RESEARCH LABS ST LOUIS MO
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