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

doi:10.1134/S1029959921050027

IMR OpenIR

	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
通讯作者	Cao, Sh(scao14b@imr.ac.cn)
	2021-09-01
发表期刊	PHYSICAL MESOMECHANICS
ISSN	1029-9599
卷号	24 期号:5 页码:513-522
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.
关键词	titanium alloys phase embrittlement generalized stacking fault energy first-principles calculations
资助者	Natural Science Foundation of China ; National Science and Technology Major Project ; China Postdoctoral Science Foundation
DOI	10.1134/S1029959921050027
收录类别	SCI
语种	英语
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
WOS类目	Mechanics ; Materials Science, Characterization & Testing
WOS记录号	WOS:000710990100002
出版者	SPRINGER
引用统计	被引频次：6[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/321006/167111
专题	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.