Process induced micro-scale evolutions can greatly influence the strength and resilience of a high temperature ceramic and intermetallic component. A micromechanical study, based on a unit cell approach, is carried out in the present work to investigate these evolutions during compaction of titanium aluminide multi-phase intermetallics at elevated temperatures. The quasi-coupled unit cell analysis can provide an avenue for investigating scalability and migratability of laboratory results to full scale productions with perturbed material compositions. Effects of various macro-scale process design considerations (e.g., tooling stiffness, spatial distribution of thermal fields) on micro-scale evolutions are investigated in detail. It has been observed that a more economic (and usually more flexible) container increases the likelihood of micro-crack nucleations, while spatially non-uniform intra-particle thermal fields can be utilized to alleviate processing induced micro-cracks in the final compacted product. Possibilities for process design modifications are also discussed.
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A Micromechanical Study of High Temperature Ti-Al Powder Compaction
Automated Analysis Corp., Ann Arbor, MI
Department of Mechanical Engineering and Engineering Mechanics, Michigan Technological University, Houghton, MI 49931
Department of Solid Mechanics, Technical University of Denmark, Lyngby, Denmark
Ren, F., Chandra, A., and Tvergaard, V. (May 1, 1998). "A Micromechanical Study of High Temperature Ti-Al Powder Compaction." ASME. J. Manuf. Sci. Eng. May 1998; 120(2): 349–358. https://doi.org/10.1115/1.2830134
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