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| MICROSTRUCTURAL CHANGE OF TC9 Ti-ALLOY DURING THERMAL EXPOSURE AT 500℃ |
| ZHANG Shaoqing (Institute of Aeronautical Materials; Beijing) |
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Cite this article:
ZHANG Shaoqing (Institute of Aeronautical Materials; Beijing). MICROSTRUCTURAL CHANGE OF TC9 Ti-ALLOY DURING THERMAL EXPOSURE AT 500℃. Acta Metall Sin, 1983, 19(6): 57-122.
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Abstract The microstructural change of TC9 Ti-alloy(Ti-6.5Al-3.5Mo-2.SSn-0.3Si)during 500℃ long-term exposure has been investigated by TEM. Such phase changes in the alloy on exposure have been observed that the Ti_3Al phase precipitates and disperses in primary a-phase; and the retained β-phase decomposes to cause the precipitation of secondary a-phase and the growth of original secondary a-phase, and the existence of type 1 and 2 of the secondary a-phase is confirmed. As the exposure prolonged, the Ti_3Al phase may gradually be increased and grew up. It is suggested that the precipitation of Ti_3Al in primary a-phase may embrittle the alloy during 500℃ exposure. Experiments identified that the orientation relation ship between Ti_3Al and a-phase is (0001)_a//(0001)_(Ti_3Al) and <2(?)0>_a//[2(?)0]_(Ti_3Al).
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Received: 18 June 1983
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