Grain size and reversible beta-to-omega phase transformation in a Ti alloy
Grain size and reversible beta-to-omega phase transformation in a Ti alloy
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DOI：
10.1016/j.scriptamat.2010.05.045
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发表时间：
2010-09
影响因子：
6
通讯作者：
Yanbo Wang;Yonghao Zhao;Q. Lian;Xiaozhou Liao;R. Valiev;S. Ringer;Yuntian Zhu;E. Lavernia
中科院分区：
文献类型：
--
作者：
Yanbo Wang;Yonghao Zhao;Q. Lian;Xiaozhou Liao;R. Valiev;S. Ringer;Yuntian Zhu;E. Lavernia
本文报道了Ti-36Nb-2.2Ta-3.7Zr-0.3O合金在严重塑性变形过程中相变的显著晶粒度效应。当晶粒尺寸大于亚微米范围时，在较低的压力(3 Gpa)和室温下，经高压扭转变形后，β相由体心立方ω相转变为六方相。但是，在相同的变形条件下，当晶粒尺寸小于100 nm时，观察到了ω到β的反向转变。
We report a significant grain size effect on the phase transformation in a Ti–36Nb–2.2Ta–3.7Zr–0.3O alloy during severe plastic deformation. For grain sizes larger than the submicrometer range, the body-centered cubic β phase transformed to hexagonal ω phase when deformed by high-pressure torsion under a relatively low pressure of 3GPa and at room temperature. However, a reverse ω to β transformation was observed under the same deformation conditions when the grain sizes were less than 100nm.