Joining of titanium aluminides using aluminum foils
- Univ. of Cincinnati, OH (United States). Dept. of Material Science and Engineering
- National Taiwan Univ., Taipei (Taiwan, Province of China). Inst. of Material Science and Engineering
Infrared joining of TiAl using aluminum foils as the filler material was investigated at temperatures between 1,050 C and 1,350 C in a flowing argon environment for times varying between 15 and 60 seconds. Using aluminum foils, the attempt was to form the Al{sub 3}Ti phase in the joint as a result of reaction between Al and TiAl at temperatures above the melting point of Al. It has been found based on X-ray diffraction and TEM analysis that, Al{sub 3}Ti, indeed is the product of infrared joining of TiAl using Al as the joining alloy. Al{sub 3}Ti was detected even in the joint processed at 1,050 C for only 15 seconds. Since the aluminum foil used in this study contains 27 at% Si, the {tau}{sub 2} phase in the Ti-Al-Si ternary system is believed to have also formed at the joint/base TiAl interface. Cross sectional studies on the joined specimens have shown different degrees of reaction depending on the temperature and time of joining. Microhardness evaluations across the joint show that the hardness near the center of the joint is typically smaller than that near the joint edge next to the base material. However, as the joining temperature and time increase, the increment of the hardness at the center of the joint is faster than that around the periphery of the joint.
- OSTI ID:
- 367620
- Report Number(s):
- CONF-960202--; ISBN 0-87339-310-4
- Country of Publication:
- United States
- Language:
- English
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