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タイトル: Mechanistic origin of grain size and oxygen interstitial effects on strain-induced α” martensitic transformation in Ti-12Mo alloy著者: Chong, Yan; Tsuru, Tomohito; Mitsuhara, Masatoshi; Guo, Baoqi; Gholizadeh, Reza; Inoue, Koji; Godfrey, Andrew; Tsuji, Nobuhiro抄録: Strain-induced α” martensitic phase transformation (SIMT) critically affects the mechanical properties of metastable β titanium alloys. In this study, the effects of β grain size and oxygen content on SIMT in a Ti-12wt.%Mo alloy were systematically investigated. It is found that SIMT is promoted by a decrease in grain size and in oxygen content. The mechanistic origins of the anomalous grain size dependency and the acute oxygen content dependency of SIMT are discussed based on multi-scale microstructural characterization and state-of-the-art simulations. In the Ti-12wt.%Mo alloy, in-situ synchrotron X-ray diffraction analysis reveals that SIMT occurs before macroscopic yielding and only leads to el ...