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      Twinning behavior of orthorhombic-α” martensite in a Ti-7.5Mo alloy

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          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.

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          Ti based biomaterials, the ultimate choice for orthopaedic implants – A review

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            Titanium alloys in total joint replacement--a materials science perspective.

            Increased use of titanium alloys as biomaterials is occurring due to their lower modulus, superior biocompatibility and enhanced corrosion resistance when compared to more conventional stainless steels and cobalt-based alloys. These attractive properties were a driving force for the early introduction of alpha (cpTi) and alpha + beta (Ti-6A1-4V) alloys as well as for the more recent development of new Ti-alloy compositions and orthopaedic metastable beta titanium alloys. The later possess enhanced biocompatibility, reduced elastic modulus, and superior strain-controlled and notch fatigue resistance. However, the poor shear strength and wear resistance of titanium alloys have nevertheless limited their biomedical use. Although the wear resistance of beta-Ti alloys has shown some improvement when compared to alpha + beta alloys, the ultimate utility of orthopaedic titanium alloys as wear components will require a more complete fundamental understanding of the wear mechanisms involved. This review examines current information on the physical and mechanical characteristics of titanium alloys used in artifical joint replacement prostheses, with a special focus on those issues associated with the long-term prosthetic requirements, e.g., fatigue and wear.
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              The crystallography of martensite transformations I

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                Author and article information

                Journal
                Sci Technol Adv Mater
                Sci Technol Adv Mater
                TSTA
                tsta20
                Science and Technology of Advanced Materials
                Taylor & Francis
                1468-6996
                1878-5514
                2019
                30 April 2019
                : 20
                : 1
                : 401-411
                Affiliations
                [a ] Research Center for Structural Materials, National Institute for Materials Science , Tsukuba, Ibaraki, Japan
                [b ] School of Materials Science and Engineering, Dalian University of Technology , Dalian, P.R. China
                [c ] Graduate School of Pure and Applied Sciences, University of Tsukuba , Tsukuba, Ibaraki, Japan
                Author notes
                CONTACT Xin Ji JI.Xin@ 123456nims.go.jp Research Center for Structural Materials, National Institute for Materials Science , 1-2-1 Sengen, Tsukuba, Ibaraki305-0047, Japan;
                Koichi Tsuchiya TSUCHIYA.Koichi@ 123456nims.go.jp Research Center for Structural Materials, National Institute for Materials Science , 1-2-1 Sengen, Tsukuba, Ibaraki305-0047, Japan
                Author information
                http://orcid.org/0000-0002-4758-5910
                http://orcid.org/0000-0003-1438-3703
                Article
                1600201
                10.1080/14686996.2019.1600201
                6508061
                12e0245e-d116-4792-a499-3993431724c8
                © 2019 The Author(s). Published by National Institute for Materials Science in partnership with Taylor & Francis Group.

                This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 14 November 2018
                : 24 March 2019
                : 24 March 2019
                Page count
                Figures: 10, Tables: 3, References: 53, Pages: 11
                Categories
                Engineering and Structural materials

                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

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