ABSTRACT

The tension–torsion properties and deformation microstructure of near β titanium alloy after various heat treatment have been investigated by transmission electron microscopy (TEM). The samples after aging treatment at 500°C for 8 h possesses obviously higher strength than those samples undergoing other different treatment on account of thin α” plates distributing uniformly in the β grains. Interestingly, precipitation of α″-martensite in α plates were observed for the first time under tension–torsion deformation. The abnormal precipitation behaviour was attributed mainly to the large tensile-shear stress.

中文翻译：

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拉扭变形下α相中α″-马氏体的异常析出行为

摘要

采用透射电子显微镜（TEM）研究了各种热处理后近β钛合金的拉扭性能和变形显微组织。经500℃时效处理8 h后的样品，由于薄的α”板均匀分布在β晶粒中，其强度明显高于其他不同处理的样品。有趣的是，在拉扭变形下首次观察到α板中α”-马氏体的析出。异常析出行为主要归因于大的拉剪应力。