Formation of nano-twinned structure in Ti3AlC2 induced by   ion-irradiation

doi:10.1016/j.actamat.2017.01.066

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	Formation of nano-twinned structure in Ti3AlC2 induced by ion-irradiation
	Yang, Tengfei ; Wang, Chenxu ; Liu, Wulong ; Liu, Shaoshuai ; Xiao, Jingren ; Huang, Qing ; Xue, Jianming ; Yan, Sha ; Wang, Yugang
刊名	ACTA MATERIALIA
	2017
关键词	MAX phases Irradiation damage Nano Structure Structural transformation ORDER-DISORDER TRANSITION AL-C SYSTEM INDUCED AMORPHIZATION THIN-FILMS MATERIALS CHALLENGES M(N+1)AX(N) PHASES NUCLEAR-ENERGY TI3SIC2 STABILITY CARBIDES
DOI	10.1016/j.actamat.2017.01.066
英文摘要	In the present study, a nano-twinned microstructure is found in ion irradiated-Ti3AlC2 by the characterizations of high-resolution transmission electron microscopy and electron diffraction, combined with grazing incidence X-ray diffraction. No obvious difference in chemical composition was observed between pristine and irradiated samples. Ti3AlC2 transforms to a cation-disordered Ti-Al-C system with the rocksalt structure after ion irradiation, in which Ti and Al atoms randomly occupy the cation sites and C atoms occupy the anion sites with occupancy of 0.5. The as-irradiated Ti3AlC2 exhibits a nano-twinned structure and the twin thickness is in the range between 2 and 10 nm. Most of defects are located at or near the twin boundaries, which may be attributed to the segregation of Al. Based on the structural variations of complex oxides induced by ion irradiation and stability of solid solution (Ti, Al)xC, it is assumed that Ti3AlC2 has a natural tendency to accommodate the defects through the chemical order to chemical disorder, low symmetry to high symmetry structural transformation. The formation mechanisms of the nano-twinned structure are related to the irradiation-induced antisite defect of cations, disorder of C atoms, and lattice structure characteristic of Ti3AlC2. Because the nano-twinned structure may significantly improve the irradiation tolerance of Ti(3)AIC(2) we study its stability under irradiation of Au ions at similar to 150 dpa. Only a moderate increase in the twin thickness is found and the nano-twinned structure is basically retained, which demonstrates the great stability of nano-twinned structure and makes Ti3AlC2 a very promising irradiation tolerant material for advanced nuclear systems.; National Magnetic Confinement Fusion Energy Research Project [2015GB113000]; China Postdoctoral Science Foundation [2015M570014]; National Natural Science Foundation of China [11675005, 11335003, 91226202, 91426304]; Major Project of the Ministry of Science and Technology of China [2015ZX06004-001]; SCI(E); ARTICLE; 1-11; 128
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/473985]
专题	工学院
推荐引用方式 GB/T 7714	Yang, Tengfei,Wang, Chenxu,Liu, Wulong,et al. Formation of nano-twinned structure in Ti3AlC2 induced by ion-irradiation[J]. ACTA MATERIALIA,2017.
APA	Yang, Tengfei.,Wang, Chenxu.,Liu, Wulong.,Liu, Shaoshuai.,Xiao, Jingren.,...&Wang, Yugang.(2017).Formation of nano-twinned structure in Ti3AlC2 induced by ion-irradiation.ACTA MATERIALIA.
MLA	Yang, Tengfei,et al."Formation of nano-twinned structure in Ti3AlC2 induced by ion-irradiation".ACTA MATERIALIA (2017).