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题名: New insight into the helium-induced damage in MAX phase Ti3AlC2 by first-principles studies
作者: Xu, Yiguo1;  Bai, Xiaojing1;  Zha, Xianhu1;  Huang, Qing1;  He, Jian2;  Luo, Kan1;  Zhou, Yuhong1;  Germann, Timothy C.3;  Francisco, Joseph S.4;  Du, Shiyu1
刊名: JOURNAL OF CHEMICAL PHYSICS
发表日期: 2015-09-21
DOI: 10.1063/1.4931398
卷: 143, 期:11
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Physics, Atomic, Molecular & Chemical
研究领域[WOS]: Physics
英文摘要: In the present work, the behavior of He in the MAX phase Ti3AlC2 material is investigated using first-principle methods. It is found that, according to the predicted formation energies, a single He atom favors residing near the Al plane in Ti3AlC2. The results also show that Al vacancies are better able to trap He atoms than either Ti or C vacancies. The formation energies for the secondary vacancy defects near an Al vacancy or a C vacancy are strongly influenced by He impurity content. According to the present results, the existence of trapped He atoms in primary Al vacancy can promote secondary vacancy formation and the He bubble trapped by Al vacancies has a higher tendency to grow in the Al plane of Ti3AlC2. The diffusion of He in Ti3AlC2 is also investigated. The energy barriers are approximately 2.980 eV and 0.294 eV along the c-axis and in the ab plane, respectively, which means that He atoms exhibit faster migration parallel to the Al plane. Hence, the formation of platelet-like bubbles nucleated from the Al vacancies is favored both energetically and kinetically. Our calculations also show that the conventional spherical bubbles may be originated from He atoms trapped by C vacancies. Taken together, these results are able to explain the observed formation of bubbles in various shapes in recent experiments. This study is expected to provide new insight into the behaviors of MAX phases under irradiation from electronic structure level in order to improve the design of MAX phase based materials. (C) 2015 AIP Publishing LLC.
关键词[WOS]: M(N+1)AX(N) PHASES ;  IRRADIATION ;  METALS ;  STABILITY ;  DIFFUSION ;  BEHAVIOR ;  TI3SIC2 ;  POINTS
语种: 英语
WOS记录号: WOS:000361843900053
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/146555
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Div Funct Mat & Nanodevices, Ningbo 315201, Zhejiang, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Biotechnol Lab, Dalian 116023, Liaoning, Peoples R China
3.Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA
4.Univ Nebraska, Coll Art & Sci, Lincoln, NE 68588 USA

Recommended Citation:
Xu, Yiguo,Bai, Xiaojing,Zha, Xianhu,et al. New insight into the helium-induced damage in MAX phase Ti3AlC2 by first-principles studies[J]. JOURNAL OF CHEMICAL PHYSICS,2015,143(11).
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