Experimental and DFT characterization of interphase boundaries in titanium and the implications for omega-assisted alpha phase precipitation

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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
发表期刊	ACTA MATERIALIA
ISSN	1359-6454
卷号	151 页码:406-415
摘要	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.; 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.
部门归属	[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
关键词	Beta-ti Alloys Transformations Nucleation Mechanism Energy
学科领域	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
资助者	National Basic Research Program of China [2014CB644001-2]; National Science Foundation of China [51471189]
收录类别	SCI
语种	英语
WOS记录号	WOS:000432760300037
引用统计	被引频次：32[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/321006/79291
专题	中国科学院金属研究所
通讯作者	Jiang, Y; Liu, HQ (reprint author), Cent S Univ, Sch Mat Sci & Engn, Key Lab Nonferrous Mat MOE, Changsha 410083, Hunan, Peoples R China.
推荐引用方式 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.