Experimental and DFT characterization of interphase boundaries in titanium and the implications for omega-assisted alpha phase precipitation
文献类型：期刊论文
| 作者 | Li, DD; Wan, WF; Zhu, LQ; Jiang, Y; Shao, SQ; Yang, GJ; Liu, HQ; Yi, DQ; Cao, S; Hu, QM |
| 刊名 | ACTA MATERIALIA
 |
| 出版日期 | 2018-06-01 |
| 卷号 | 151页码:406-415 |
| ISSN号 | 1359-6454 |
| 关键词 | Beta-ti Alloys Transformations Nucleation Mechanism Energy |
| 英文摘要 | 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. |
| 学科主题 | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| 资助机构 | National Basic Research Program of China [2014CB644001-2]; National Science Foundation of China [51471189] |
| 公开日期 | 2018-06-05 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/79291]  |
| 专题 | 金属研究所_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. |
入库方式： OAI收割
来源：金属研究所
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