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| Research of the influence of thermohydrogen treatment on microstructural evolution and hardness of Ti600 alloy |
| ZHAO Jing-Wei;;;;; |
| 东北大学材料与冶金学院 |
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Cite this article:
ZHAO Jing-Wei. Research of the influence of thermohydrogen treatment on microstructural evolution and hardness of Ti600 alloy. Chin J Mater Res, 2008, 22(3): 262-268.
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Abstract The influence of thermohydrogen treatment (THT) on microstructural evolution and hardness of Ti600 alloy has been studied. The microstructural evolution of Ti600 alloy after THT have been investigated and analysed by X-ray diffraction (XRD) and transmission electron microscopy (TEM), and the influence of THT on the hardness of Ti600 alloy has been analysed by hardness testing. The microstructural observation reveals that there are two types of silicides precipitate in the Ti6oo alloy after THT, one is tetragonal silicide S3 (0.357 wt.% H), and the other is hexagonal silicide S1 (0.497 wt.%). Hydrides δ (fcc structure) exist in the specimens with 0.357 wt.% and 0.497 wt.% hydrogen, and hydride δ tends to be refined with increasing of hydrogen. The result of hardness testing shows that the hardness of Ti600 alloy increases with increasing of hydrogen. Additionally, the influence mechanisms of THT to the hardness of Ti600 alloy are discussed, and it is considered in this paper that hydride δ, silicide and lattice defects are the major factors leading to the hardness of Ti600 alloy increase with increasing of hydrogen.
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Received: 30 July 2007
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