Twinning behavior of orthorhombic-α" martensite in a Ti-7.5Mo alloy. Issue 1 (31st December 2019)

• Record Type: Journal Article
• Authors: Ji, Xin; Gutierrez-Urrutia, Ivan; Emura, Satoshi; Liu, Tianwei; Hara, Toru; Min, Xiaohua; Ping, Dehai; Tsuchiya, Koichi
• Is Part Of: Science and technology of advanced materials. Volume 20:Issue 1(2019)
• Page Start: 401
• Page End: 411
• Publication Date: 2019-12-31
• Subjects: β-Titanium alloys -- orthorhombic-α" martensite -- deformation twinning -- transformation twinning -- transmission electron microscopy; 10 Engineering and Structural materials -- 106 Metallic materials -- 303 Mechanical / Physical processing -- 503 TEM, STEM, SE -- 504 X-ray / Neutron diffraction and scattering; Materials -- Technological innovations -- Periodicals; 620.112
• DOI: 10.1080/14686996.2019.1600201
• Languages: English
• ISSNs: 1468-6996

Abstract

ABSTRACT: Deformation microstructure of orthorhombic-α" 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 α" plates contain {111}α" -type I transformation twins generated to accommodate transformation strain from bcc-β to orthorhombic-α" martensite. Tensile deformation up to strain level of 5% induces {112}α" -type I deformation twins. The activation of {112}α" -type I deformation twinning mode is reported for the first time in α" martensite in β-Ti alloys. {112}α" -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}α" -type I twinning were proposed. Abstract : uf0001