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Experimental and DFT characterization of interphase boundaries in titanium and the implications for omega-assisted alpha phase precipitation
Li, DD; Wan, WF; Zhu, LQ; Jiang, Y; Shao, SQ; Yang, GJ; Liu, HQ; Yi, DQ; Cao, S; Hu, QM; Liu, HQ (reprint author), Cent S Univ, Sch Mat Sci & Engn, Key Lab Nonferrous Mat MOE, Changsha 410083, Hunan, Peoples R China.
2018-06-01
Source PublicationACTA MATERIALIA
ISSN1359-6454
Volume151Pages:406-415
AbstractAn intricate understanding of the fundamental beta ->alpha phase transformation upon the presence of metastable omega phase is vital for tailoring the multiphase microstructures of titanium and titanium alloys for various specific applications. To approach this, the structures and energetics of heterophase interfaces among alpha, beta, and omega in titanium were thoroughly investigated, using the combination of high-resolution transmission electron microscopy and first-principles density functional theory calculations. The results strongly suggest that metastable w does not necessarily act as the precursor of alpha but can reduce the energy barrier for a nucleation in beta. The omega/beta interfaces acts as favorable nucleation sites for a which, once forms, tends to grow favorably into the beta matrix. These findings validate the omega-assisted alpha nucleation mechanism, and adequately rationalize many TEM observations on titanium alloys. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.; An intricate understanding of the fundamental beta ->alpha phase transformation upon the presence of metastable omega phase is vital for tailoring the multiphase microstructures of titanium and titanium alloys for various specific applications. To approach this, the structures and energetics of heterophase interfaces among alpha, beta, and omega in titanium were thoroughly investigated, using the combination of high-resolution transmission electron microscopy and first-principles density functional theory calculations. The results strongly suggest that metastable w does not necessarily act as the precursor of alpha but can reduce the energy barrier for a nucleation in beta. The omega/beta interfaces acts as favorable nucleation sites for a which, once forms, tends to grow favorably into the beta matrix. These findings validate the omega-assisted alpha nucleation mechanism, and adequately rationalize many TEM observations on titanium alloys. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
description.department[li, dongdong ; wan, weifeng ; zhu, lvqi ; jiang, yong ; shao, shouqi ; yang, gaojing ; liu, huiqun ; yi, danqing] cent s univ, sch mat sci & engn, key lab nonferrous mat moe, changsha 410083, hunan, peoples r china ; [jiang, yong] cent s univ, natl key lab powder met, changsha 410083, hunan, peoples r china ; [cao, shuo ; hu, qingmiao] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, liaoning, peoples r china
KeywordBeta-ti Alloys Transformations Nucleation Mechanism Energy
Subject AreaMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationNational Basic Research Program of China [2014CB644001-2]; National Science Foundation of China [51471189]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79291
Collection中国科学院金属研究所
Corresponding AuthorJiang, Y; Liu, HQ (reprint author), Cent S Univ, Sch Mat Sci & Engn, Key Lab Nonferrous Mat MOE, Changsha 410083, Hunan, Peoples R China.
Recommended Citation
GB/T 7714
Li, DD,Wan, WF,Zhu, LQ,et al. Experimental and DFT characterization of interphase boundaries in titanium and the implications for omega-assisted alpha phase precipitation[J]. ACTA MATERIALIA,2018,151:406-415.
APA Li, DD.,Wan, WF.,Zhu, LQ.,Jiang, Y.,Shao, SQ.,...&Liu, HQ .(2018).Experimental and DFT characterization of interphase boundaries in titanium and the implications for omega-assisted alpha phase precipitation.ACTA MATERIALIA,151,406-415.
MLA Li, DD,et al."Experimental and DFT characterization of interphase boundaries in titanium and the implications for omega-assisted alpha phase precipitation".ACTA MATERIALIA 151(2018):406-415.
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