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Origin of the omega-Strengthening and Embrittlement in beta-Titanium Alloys: Insight from First Principles
Cao, Sh1; Chen, W.2; Yang, R.1; Hu, Q-M1
Corresponding AuthorCao, Sh(scao14b@imr.ac.cn)
2021-09-01
Source PublicationPHYSICAL MESOMECHANICS
ISSN1029-9599
Volume24Issue:5Pages:513-522
AbstractThe 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.
Keywordtitanium alloys phase embrittlement generalized stacking fault energy first-principles calculations
Funding OrganizationNatural Science Foundation of China ; National Science and Technology Major Project ; China Postdoctoral Science Foundation
DOI10.1134/S1029959921050027
Indexed BySCI
Language英语
Funding ProjectNatural 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 Research AreaMechanics ; Materials Science
WOS SubjectMechanics ; Materials Science, Characterization & Testing
WOS IDWOS:000710990100002
PublisherSPRINGER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/167111
Collection中国科学院金属研究所
Corresponding AuthorCao, Sh
Affiliation1.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
Recommended Citation
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.
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