Effect of aging on microstructure and properties of rare earth Sc microalloyed titanium alloy

doi:10.13251/j.issn.0254-6051.2022.07.007

Abstract

Abstract: In order to improve the service life of titanium alloys at high temperatures, experimental research on high temperature creep of rare-earth scandium microalloyed titanium alloy materials was carried out. The Ti64-0.25Si-xSc (x=0, 0.3) alloys were aged at different temperatures for different time after solid solution treatment (950 ℃×0.5 h, AC), then the Vickers hardness and high temperature creep properties of the alloys were tested, the creep curves were fitted to a time hardening creep model ε=Aσⁿt^m, and the microstructure of the alloys were analyzed by OM and TEM. The results show that the creep properties of the alloys are the best when aged at 510 ℃ for 6 h, for the scandium addition can inhibit the grain growth, change the grain orientation distribution, and promote the formation of basket-weave structure; and the formation of Sc₂O₃ in the alloy can purify the matrix, which has a significant effect on improving the high temperature creep performance of the alloys. There are a large number of dislocation interaction, stacking and entanglement in the alloy microstructure, and the creep mechanism of the alloy is mainly the slip of dislocation.

Key words: rare earth scandium, titanium alloy, microstructure, Vickers hardness, high temperature creep

CLC Number:

TG146.23

Zhong Xiuyang, Deng Tongsheng, Zhu Zhiyun, Li Shang, Zhong Ming, Guo Tao. Effect of aging on microstructure and properties of rare earth Sc microalloyed titanium alloy[J]. Heat Treatment of Metals, 2022, 47(7): 40-46.

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