Dislocation formation and twinning from the crack tip in Ni3Al: molecular dynamics simulations | |
Xie Hong-Xian1; Wang Chong-Yu1,2,3; Yu Tao1; Du Jun-Ping1 | |
Corresponding Author | Xie Hong-Xian(hongxianxie@163.com) |
2009 | |
Source Publication | CHINESE PHYSICS B
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ISSN | 1674-1056 |
Volume | 18Issue:1Pages:251-258 |
Abstract | The mechanism of low-temperature deformation in a fracture process of L1(2) Ni3Al is studied by molecular dynamic simulations. Owing to the unstable stacking energy, the [0 (1) over bar1] superdislocation is dissociated into partial dislocations separated by a stacking fault. The simulation results show that when the crack speed is larger than a critical speed, the Shockley partial dislocations will break forth from both the crack tip and the vicinity of the crack tip; subsequently the super intrinsic stacking faults are formed in adjacent {111} planes, meanwhile the super extrinsic stacking faults and twinning also occur. Our simulation results suggest that at low temperatures the ductile fracture in L1(2) Ni3Al is accompanied by twinning, which is produced by super-intrinsic stacking faults formed in adjacent {111} planes. |
Keyword | molecular dynamic crack Shockley partial dislocation stacking fault |
Funding Organization | National Basic Research Program of China ; National Natural Science Foundation of China |
Indexed By | SCI |
Language | 英语 |
Funding Project | National Basic Research Program of China[2006CB605102] ; National Natural Science Foundation of China[90306016] |
WOS Research Area | Physics |
WOS Subject | Physics, Multidisciplinary |
WOS ID | WOS:000262494700041 |
Publisher | IOP PUBLISHING LTD |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://ir.imr.ac.cn/handle/321006/96300 |
Collection | 中国科学院金属研究所 |
Corresponding Author | Xie Hong-Xian |
Affiliation | 1.Cent Iron & Steel Res Inst, Beijing 100081, Peoples R China 2.Chinese Acad Sci, Int Ctr Mat Phys, Shenyang 110016, Peoples R China 3.Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China |
Recommended Citation GB/T 7714 | Xie Hong-Xian,Wang Chong-Yu,Yu Tao,et al. Dislocation formation and twinning from the crack tip in Ni3Al: molecular dynamics simulations[J]. CHINESE PHYSICS B,2009,18(1):251-258. |
APA | Xie Hong-Xian,Wang Chong-Yu,Yu Tao,&Du Jun-Ping.(2009).Dislocation formation and twinning from the crack tip in Ni3Al: molecular dynamics simulations.CHINESE PHYSICS B,18(1),251-258. |
MLA | Xie Hong-Xian,et al."Dislocation formation and twinning from the crack tip in Ni3Al: molecular dynamics simulations".CHINESE PHYSICS B 18.1(2009):251-258. |
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