Release Time:2019-07-01  Hits:

Indexed by: Journal Article

Date of Publication: 2019-12-31

Journal: SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS

Included Journals: EI、PubMed、SCIE

Volume: 20

Issue: 1

Page Number: 401-411

ISSN: 1468-6996

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

Abstract: 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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