L1{sub 2} (Al,Cr){sub 3}Ti-based two-phase intermetallic compounds. 2: Application to coating materials on TiAl
- KAIST, Taejon (Korea, Republic of). Dept. of Materials Science and Engineering
- Hyundai Electronics Industries Co. Ltd., Ichon (Korea, Republic of). Package Development Dept.
- Kumoh National Univ. of Technology, Kumi (Korea, Republic of). Dept. of Materials Science and Engineering
The gamma-based TiAl alloy has been known to be one of the most promising candidates for high-temperature structural materials because of its high specific strength and good creep properties. However, its poor ductility at room temperature and poor oxidation resistance at elevated temperature are considered the major limitations against its practical use. Therefore, a great deal of research on improving the room temperature ductility of TiAl has been carried out recently. However, relatively less effort has been devoted to improvement in the oxidation resistance of TiAl. One of the methods for improving oxidation resistance is the addition of third elements to TiAl in order to enhance the formation of a protective Al{sub 2}O{sub 3} layer. However, some alloying elements were reported to reduce the mechanical properties of TiAl. The other way to overcome this problem is surface coating, which is expected to be effective for improving the oxidation resistance while maintaining good mechanical properties. The aim of this study is to investigate the possibility of applying L1{sub 2} (Al,Cr){sub 3}Ti-based two-phase alloys as a coating material on TiAl. Ti-48Al specimens were coated with the Al-21Ti-23Cr film using the RF magnetron sputtering method, and the isothermal oxidation behavior of the coated specimen was investigated.
- Sponsoring Organization:
- Korea Science and Engineering Foundation (Korea, Republic of)
- OSTI ID:
- 460430
- Journal Information:
- Scripta Materialia, Vol. 36, Issue 7; Other Information: PBD: 1 Apr 1997
- Country of Publication:
- United States
- Language:
- English
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