Origin of the omega-Strengthening and Embrittlement in beta-Titanium Alloys: Insight from First Principles

doi:10.1134/S1029959921050027

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	Origin of the omega-Strengthening and Embrittlement in beta-Titanium Alloys: Insight from First Principles
	Cao, Sh 1; Chen, W.2; Yang, R.1; Hu, Q-M 1
刊名	PHYSICAL MESOMECHANICS
	2021-09-01
卷号	24 期号:5 页码:513-522
关键词	titanium alloys phase embrittlement generalized stacking fault energy first-principles calculations
ISSN号	1029-9599
DOI	10.1134/S1029959921050027
通讯作者	Cao, Sh(scao14b@imr.ac.cn)
英文摘要	The omega-phase precipitates in beta-Ti alloys increase the strength but significantly degrade the ductility of the alloys. In the present work, the mechanism of omega-strengthening and embrittlement is investigated by using a first principles method based on density functional theory. The generalized stacking fault energies of various slip systems in both the beta and omega phases are calculated. The strengthening and embrittlement effects of the omega phase are discussed by comparing the slip energy barriers of slip systems in the beta and omega phases with different orientation relationships. It is found that the slip energy barriers of slip systems in the omega phase, except for ((2) over bar 020){[0001](omega), are much higher than those of slip systems in the beta phase, which explains the omega-strengthening and embrittlement effects. The slip energy barrier of the most active slip system in the phase, ((2) over bar 020){[0001](omega), increases with the depletion of Mo and increasing extent of structure collapse, suggesting that aging treatment enhances the -strengthening and embrittlement effects.
资助项目	Natural Science Foundation of China[91860107] ; Natural Science Foundation of China[52071315] ; Natural Science Foundation of China[52001307] ; National Science and Technology Major Project[J2019-VI0012-0126] ; China Postdoctoral Science Foundation[2019M661149]
WOS研究方向	Mechanics ; Materials Science
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000710990100002
资助机构	Natural Science Foundation of China ; National Science and Technology Major Project ; China Postdoctoral Science Foundation
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/167110]
专题	金属研究所_中国科学院金属研究所
通讯作者	Cao, Sh
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China
推荐引用方式 GB/T 7714	Cao, Sh,Chen, W.,Yang, R.,et al. Origin of the omega-Strengthening and Embrittlement in beta-Titanium Alloys: Insight from First Principles[J]. PHYSICAL MESOMECHANICS,2021,24(5):513-522.
APA	Cao, Sh,Chen, W.,Yang, R.,&Hu, Q-M.(2021).Origin of the omega-Strengthening and Embrittlement in beta-Titanium Alloys: Insight from First Principles.PHYSICAL MESOMECHANICS,24(5),513-522.
MLA	Cao, Sh,et al."Origin of the omega-Strengthening and Embrittlement in beta-Titanium Alloys: Insight from First Principles".PHYSICAL MESOMECHANICS 24.5(2021):513-522.