Ab initio study of irradiation tolerance for different M(n+1)AX(n) phases: Ti3SiC2 and Ti3AlC2

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	Ab initio study of irradiation tolerance for different M(n+1)AX(n) phases: Ti3SiC2 and Ti3AlC2
	Zhao, Shijun ; Xue, Jianming ; Wang, Yugang ; Huang, Qing
刊名	JOURNAL OF APPLIED PHYSICS
	2014
卷号	115 期号:2
中文摘要	Layered ternary M(n+1)AX(n) (MAX) materials are recently proposed to be promising candidates for future fission and fusion programmes because of their unique properties inherited from both ceramics and metals. However, different M(n+1)AX(n) materials demonstrate different behaviors when exposed to energetic neutron or ion irradiations. Based on first-principles calculations, we have investigated the irradiation tolerance of two typical M(n+1)AX(n) materials: Ti3SiC2 and Ti3AlC2 from two aspects. First, we make a detailed analysis on the interatomic bonding characters, which are believed to be responsible for the resistance to radiation-induced amorphization. Second, the formation energies of various intrinsic and antisite defects in these two compounds are calculated in order to elucidate their amorphization mechanism. Our results show that the absence of orbitals overlap of Al-C in Ti3AlC2 renders it more resistant to amorphization compared to Ti3SiC2. In addition, the antisite defects Al-Ti(1) and Al-Ti(2) in Ti3AlC2 have much lower formation energies compared to Si-Ti(1) and Si-Ti(2) in Ti3SiC2, which implies that the replacement of Ti with Al is easier than Si, thus providing an alternative way to accommodate the defects resulted from irradiation damage cascades. These results indicate that Ti3AlC2 is more irradiation tolerant than Ti3SiC2, in accordance with experimental observations. Our results have profound implications for the choice of appropriate MAX phase with best performance to be used in next reaction reactors. (C) 2014 AIP Publishing LLC.
公开日期	2015-09-20
内容类型	期刊论文
源URL	[http://ir.nimte.ac.cn/handle/174433/11960]
专题	宁波材料技术与工程研究所_2014专题
推荐引用方式 GB/T 7714	Zhao, Shijun,Xue, Jianming,Wang, Yugang,et al. Ab initio study of irradiation tolerance for different M(n+1)AX(n) phases: Ti3SiC2 and Ti3AlC2[J]. JOURNAL OF APPLIED PHYSICS,2014,115(2).
APA	Zhao, Shijun,Xue, Jianming,Wang, Yugang,&Huang, Qing.(2014).Ab initio study of irradiation tolerance for different M(n+1)AX(n) phases: Ti3SiC2 and Ti3AlC2.JOURNAL OF APPLIED PHYSICS,115(2).
MLA	Zhao, Shijun,et al."Ab initio study of irradiation tolerance for different M(n+1)AX(n) phases: Ti3SiC2 and Ti3AlC2".JOURNAL OF APPLIED PHYSICS 115.2(2014).