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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 AuthorXie Hong-Xian(hongxianxie@163.com)
2009
Source PublicationCHINESE PHYSICS B
ISSN1674-1056
Volume18Issue:1Pages:251-258
AbstractThe 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.
Keywordmolecular dynamic crack Shockley partial dislocation stacking fault
Funding OrganizationNational Basic Research Program of China ; National Natural Science Foundation of China
Indexed BySCI
Language英语
Funding ProjectNational Basic Research Program of China[2006CB605102] ; National Natural Science Foundation of China[90306016]
WOS Research AreaPhysics
WOS SubjectPhysics, Multidisciplinary
WOS IDWOS:000262494700041
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:16[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/96300
Collection中国科学院金属研究所
Corresponding AuthorXie Hong-Xian
Affiliation1.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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