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In-situ microstructural investigations of the TRIP-to-TWIP evolution in Ti-Mo-Zr alloys as a function of Zr concentration

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Journal of Materials Science & Technology 2021年第6期65卷 228-237页

作者： Bingnan Qian Jinyong Zhang Yangyang Fu Fan Sun Yuan Wu Jun Cheng Philippe Vermaut frederic prima Chimie ParisTech PSL UniversityCNRSInstitut de Recherche de Chimie Paris75005 PahsFrance School of Material Science and Engineering China University of Mining and TechnologyXuzhou Jiangsu 221008China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'anShaanxi 710072China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Northwest Institute for Non-ferrous Metal Research Shaanxi Key Laboratory of Biomedical Metal MaterialsXi'an 710016China Sorbonne Universities UPMC University ParisUFR92675005 ParisFrance

Aiming at overcoming the strength-ductility trade-off in structural Ti-alloys,a new family of TRIP/TWIP Ti-alloys was developed in the past decade(TWIP:twinning-induced plasticity;TRIP:transformationinduced plasticity).Herein,we study the tunable nature of deformation mechanisms with various TWIP and TRIP contributions by fine adjustment of the Zr content on ternary Ti-12 Mo-xZr(x=3,6,10)*** microstructure and deformation mechanisms of the Ti-Mo-Zr alloys are explored by using in-situ electron backscatter diffraction(EBSD)and transmission electron microscopy(TEM).The results show that a transition of the dominant deformation mode occurred,going from TRIP to TWIP major mechanism with increasing Zr *** the Ti-12 Mo-3 Zr alloy,the stress-induced martensitic transformation(SIM)is the major deformation mode which accommodates the plastic *** the Ti-12 Mo-6 Zr alloy,the combined deformation twinning(DT)and SIM modes both contribute to the overall plasticity with enhanced strain-hardening rate and subsequent large uniform *** increase of the Zr content in Ti-12 Mo-10 Zr alloy leads to an improved yield stress involving single DT mode as a dominant deformation mechanism throughout the plastic *** the present work,a set of comprehensive in-situ and ex-situ microstructural investigations clarify the evolution of deformation microstructures during tensile loading and unloading processes.

关键词： Metastable beta(β)Ti-alloys TRIP/TWIP effects Deformation mechanisms In-situ traction-EBSD TEM observation

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A kink-bands reinforced titanium alloy showing 1.3 GPa compressive yield strength:Towards extra high-strength/strain-transformable Ti alloys

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Journal of Materials Science & Technology 2021年第15期74卷 21-26页

作者： Jinyong Zhang Bingnan Qian Yijin Wu Yu Wang Jun Cheng Zheng Chen Jinshan Li Fan Sun frederic prima State Key Laboratory of Solidification Processing Northwestern Poly technical UniversityXi’an 7 W072China School of Material Science and Engineering China University of Mining and TechnologyXuzhou 221008China PSL Research University Chimie ParisTech-CNRSInstitut de Recherche de Chimie ParisParis 75005France Beijing General Research Institute of Mining and Metallurgy Beijing 102206China Northwest Institute for Non-ferrous Metal Research Shaanxi Key Laboratory of Biomedical Metal MaterialsXi'an 710016China

*** In structural metallic materials,the occurrence of particular deformation mechanisms such as dislocation slip,deformation twins(DTs)[1,2]deformation kink bands(KBs)[3,4]or stressinduced phase transformations(SIM)[5],are closely related to both their crystal structures[6–8](***,BCC and HCP)and loading conditions(*** and/or strain rate).

关键词： deformation strength strain

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