微观结构
粉末冶金
材料科学
冶金
合金
钛合金
钛
作者
Rui Guo,Bin Liu,Rongjun Xu,Yuankui Cao,Jingwen Qiu,Feng Chen,Zhiqiao Yan,Yong Liu
标识
DOI:10.1016/j.msea.2020.138993
摘要
Abstract The service temperature of high temperature titanium alloy has been raised from 400 °C to 650 °C in the last years. In this study, a new near α high temperature titanium alloy with high Si content (Ti–6Al–4Zr-0.5Mo-0.6Si, wt. %) which can serve at 700 °C was developed by powder metallurgy (P/M) method. The microstructure and mechanical properties were investigated. The results show that the P/M titanium alloy exhibits an α + β two-phase microstructure with dispersed fine S2 type silicide ((TiZr)6Si3). The yield strength and ultimate tensile strength are 1023 MPa and 1190 MPa at room temperature, with an elongation of 10%. At 700 °C, the alloy still maintains a yield strength, an ultimate strength, and an elongation of 510 MPa, 651 MPa and 13%, respectively. The high strength is mainly attributed to the precipitation strengthening of the silicide and the formation of fine-grained α′ phase.
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