Origin of the ductile-to-brittle transition of metastable beta-titanium alloys: Self-hardening of omega-precipitates

doi:10.1016/j.actamat.2019.03.034

IMR OpenIR

	Origin of the ductile-to-brittle transition of metastable beta-titanium alloys: Self-hardening of omega-precipitates
	Chen, Wei 1; Cao, Shuo 2,3; Kou, Wenjuan 1; Zhang, Jinyu 1; Wang, Yue 1; Zha, You 1; Pan, Yan 1; Hu, Qingmiao 2,3; Sun, Qiaoyan 1; Sun, Jun 1
通讯作者	Zhang, Jinyu(jinyuzhang1002@mail.xjtu.edu.cn) ; Hu, Qingmiao(qmhu@imr.ac.cn)
	2019-05-15
发表期刊	ACTA MATERIALIA
ISSN	1359-6454
卷号	170 页码:187-204
摘要	The ductile-to-brittle transition is commonly observed in metastable beta-titanium (Ti) alloys containing omega-precipitates, while the fundamental understanding on omega-embrittlement hitherto remains elusive. In this work, the prototypical Ti-20 wt% Mo metastable beta-Ti alloy has been systematically investigated by coupling experiments and first-principles calculation to eliminate this puzzle. It is shown that the structural evolution of omega-phase controls the deformation mechanism transition of twinning-to-slip in Ti Mo alloy, being the origin of ductile-to-brittle transition of this alloy. The initial trigonal omega-structure continuously collapses to hexagonal omega-structure (structural collapse) whilst Mo-atoms are rejected out concurrently (stoichiometric varieties), both leading to hardening of omega-precipitates. This self-hardening of omega-precipitates was further rationalized in terms of the enhanced propensity for a covalent character of the atomic bond demonstrated by the electronic density of states (DOS) from first-principles calculation. Specifically, the self-hardening behavior of omega-precipitates promotes dislocation slip on isolated planes in lieu of correlative slip on successive planes inside omega 1-variant, while dislocations are completely blocked ahead omega 2/omega 3/omega 4-variants. This in turn renders the transition from deformation twinning that contributes to great macro-plasticity to ordinary dislocation slip that contributes to localized deformation bands in the present Ti-Mo alloy. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
关键词	beta-titanium alloys omega-precipitates Embrittlement Dislocations First-principles calculation
资助者	National Natural Science Foundation of China ; 973 Program of China ; National Key Research and Development Program of China ; 111 Project 2.0 of China ; Natural Science Basic Research Plan in Shaanxi Province of China ; International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technologies ; Fok Ying-Tong Education Foundation ; Shaanxi Province Innovative Talents Promotion Projects
DOI	10.1016/j.actamat.2019.03.034
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51871176] ; National Natural Science Foundation of China[51621063] ; National Natural Science Foundation of China[51722104] ; National Natural Science Foundation of China[91860107] ; 973 Program of China[2014CB644002] ; National Key Research and Development Program of China[2017YFA0700701] ; National Key Research and Development Program of China[2017YFB0702301] ; 111 Project 2.0 of China[BP2018008] ; Natural Science Basic Research Plan in Shaanxi Province of China[2018JM5098] ; International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technologies ; Fok Ying-Tong Education Foundation[161096] ; Shaanxi Province Innovative Talents Promotion Projects[2018KJXX-004]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000466252400017
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：66[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/133199
专题	中国科学院金属研究所
通讯作者	Zhang, Jinyu; Hu, Qingmiao
作者单位	1.Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shengyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Chen, Wei,Cao, Shuo,Kou, Wenjuan,et al. Origin of the ductile-to-brittle transition of metastable beta-titanium alloys: Self-hardening of omega-precipitates[J]. ACTA MATERIALIA,2019,170:187-204.
APA	Chen, Wei.,Cao, Shuo.,Kou, Wenjuan.,Zhang, Jinyu.,Wang, Yue.,...&Sun, Jun.(2019).Origin of the ductile-to-brittle transition of metastable beta-titanium alloys: Self-hardening of omega-precipitates.ACTA MATERIALIA,170,187-204.
MLA	Chen, Wei,et al."Origin of the ductile-to-brittle transition of metastable beta-titanium alloys: Self-hardening of omega-precipitates".ACTA MATERIALIA 170(2019):187-204.