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

被引:0
|
作者
Qian, Bingnan [1 ]
Zhang, Jinyong [2 ,3 ]
Fu, Yangyang [2 ]
Sun, Fan [1 ]
Wu, Yuan [4 ]
Cheng, Jun [3 ,5 ]
Vermaut, Philippe [1 ,6 ]
Prima, Frédéric [1 ]
机构
[1] Chimie ParisTech, PSL University, CNRS, Institut de Recherche de Chimie Paris, Paris,75005, France
[2] School of Material Science and Engineering, China University of Mining and Technology, Xuzhou,Jiangsu,221008, China
[3] State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an,Shaanxi,710072, China
[4] State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing,100083, China
[5] Northwest Institute for Non-ferrous Metal Research, Shaanxi Key Laboratory of Biomedical Metal Materials, Xi'an,710016, China
[6] Sorbonne Universities, UPMC University Paris, UFR926, Paris,75005, France
来源
Journal of Materials Science and Technology | 2021年 / 65卷
基金
中国国家自然科学基金; 中国博士后科学基金;
关键词
High resolution transmission electron microscopy - Molybdenum alloys - Deformation - Strain hardening - Unloading - Martensitic transformations - Strain rate - Ternary alloys - Titanium alloys - Economic and social effects - Microstructure - Yield stress - Twinning;
D O I
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中图分类号
学科分类号
摘要
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: transformation-induced 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-12Mo-xZr (x = 3, 6, 10) alloys. The 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 content. In the Ti-12Mo-3Zr alloy, the stress-induced martensitic transformation (SIM) is the major deformation mode which accommodates the plastic flow. Regarding the Ti-12Mo-6Zr alloy, the combined deformation twinning (DT) and SIM modes both contribute to the overall plasticity with enhanced strain-hardening rate and subsequent large uniform ductility. Further increase of the Zr content in Ti-12Mo-10Zr alloy leads to an improved yield stress involving single DT mode as a dominant deformation mechanism throughout the plastic regime. In 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. © 2020
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页码:228 / 237
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