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RESEARCH PAPERS

A Micromechanical Study of High Temperature Ti-Al Powder Compaction

[+] Author and Article Information
F. Ren

Automated Analysis Corp., Ann Arbor, MI

A. Chandra

Department of Mechanical Engineering and Engineering Mechanics, Michigan Technological University, Houghton, MI 49931

V. Tvergaard

Department of Solid Mechanics, Technical University of Denmark, Lyngby, Denmark

J. Manuf. Sci. Eng 120(2), 349-358 (May 01, 1998) (10 pages) doi:10.1115/1.2830134 History: Received May 01, 1995; Revised August 01, 1997; Online January 17, 2008

Abstract

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.

Copyright © 1998 by The American Society of Mechanical Engineers
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