Characterization of precipitates of Ti{sub 3}Al in a titanium alloy
- Ohio State Univ., Columbus, OH (United States)
- Wright Lab., Wright Patterson AFB, OH (United States)
A two phase alpha-beta titanium alloy, Ti-6Al-2Mo-2Cr-2Sn-2Zr-0.2Si (Ti-6-22-22S), has recently been reconsidered as a high temperature material for aircraft engine applications. This alloy exhibits specific strength and fracture toughness superior to those of Ti-6Al-4V. However, similar to other alpha-beta titanium alloys, microstructural stability is one of the major concerns regarding industrial application of Ti-6-22-22S, since changes of the microstructure during long term high temperature exposure significantly affect the performance of components. Two types of precipitates have been observed in Ti-6-22-22S alloys, namely silicides and alpha 2-Ti{sub 3}Al{sup 2}. The presence of intermetallic precipitates, such as alpha 2-Ti{sub 3}Al, in the parent alpha matrix has been reported to result in brittle behaviour of the alpha-beta alloys due to the formation of intense planar slip bands. The present paper presents results of the characterization of intermetallic alpha2-Ti{sub 3}Al precipitates in the alpha phase by methods of scanning and transmission electron microscopy (SEM and TEM respectively).
- OSTI ID:
- 468962
- Report Number(s):
- CONF-960877--
- Country of Publication:
- United States
- Language:
- English
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