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论文类型：期刊论文

发表时间：2019-12-31

发表刊物：SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS

收录刊物：SCIE、PubMed、EI

卷号：20

期号：1

页面范围：401-411

ISSN号：1468-6996

关键字：beta-Titanium alloys; orthorhombic-alpha" martensite; deformation twinning; transformation twinning; transmission electron microscopy

摘要：Deformation microstructure of orthorhombic-alpha" martensite in a Ti-7.5Mo (wt.%) alloy was investigated by tracking a local area of microstructure using scanning electron microscopy, electron back-scattered diffraction, and transmission electron microscopy. The as-quenched alpha" plates contain {111}(alpha")-type I transformation twins generated to accommodate transformation strain from bcc-beta to orthorhombic-alpha" martensite. Tensile deformation up to strain level of 5% induces {112}(alpha")-type I deformation twins. The activation of {112}(alpha")-type I deformation twinning mode is reported for the first time in alpha" martensite in beta-Ti alloys. {112}(alpha")-type I twinning mode was analyzed by the crystallographic twinning theory by Bilby and Crocker and the most possible mechanism of atomic displacements (shears and shuffles) controlling the newly reported {112}(alpha")-type I twinning were proposed.
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