L1{sub 2} (Al,Cr){sub 3}Ti-based two-phase intermetallic compounds. 1: Plastic deformation behavior
- KAIST, Taejon (Korea, Republic of). Dept. of Materials Science and Engineering
- Kumoh National Univ. of Technology, Kumi (Korea, Republic of). Dept. of Materials Science and Engineering
- Tokyo Inst. of Technology, Yokohama (Japan)
A number of recent works on intermetallic compounds in the Ti-Al system have concentrated on gamma-based TiAl, but Al{sub 3}Ti is especially attractive because of its low density and good oxidation resistance. However, Al{sub 3}Ti, with a low-symmetry tetragonal D0{sub 22} structure, exhibits less than 1% compressive strain in the temperature range of 298 K to 893 K, for which the primary deformation mode is ordered twinning. Therefore, its brittleness limits its practical application as a structural material. More recently, much work has been conducted on the transformation of crystal structure through the addition of ternary alloying elements to improve the ductility of Al{sub 3}Ti. In this study, the plastic deformation behavior of two-phase intermetallic compounds consisting of mainly L1{sub 2} phase and the second phases in Al-Ti-Cr system was investigated. As in the case of {alpha}{sub 2}/{gamma} two-phase TiAl compounds, the possibility of ductilizing two-phase intermetallic compounds based on L1{sub 2}-type (Al,Cr){sub 3}Ti was examined. The influence of pore formation, ingot cast structure and second phase morphology on ductility of the alloy was also examined.
- OSTI ID:
- 460429
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 7 Vol. 36; ISSN 1359-6462; ISSN SCMAF7
- Country of Publication:
- United States
- Language:
- English
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