Dislocation formation and twinning from the crack tip in Ni(3)Al: molecular dynamics simulations

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	Dislocation formation and twinning from the crack tip in Ni(3)Al: molecular dynamics simulations
	H. X. Xie; C. Y. Wang; T. Yu; J. P. Du
	2009
发表期刊	Chinese Physics B
ISSN	1674-1056
卷号	18 期号:1 页码:251-258
摘要	The mechanism of low-temperature deformation in a fracture process of L1(2) Ni(3)Al 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) Ni(3)Al is accompanied by twinning, which is produced by super-intrinsic stacking faults formed in adjacent {111} planes.
部门归属	[xie hong-xian; wang chong-yu; yu tao; du jun-ping] cent iron & steel res inst, beijing 100081, peoples r china. [wang chong-yu] chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china. [wang chong-yu] tsinghua univ, dept phys, beijing 100084, peoples r china.;xie, hx (reprint author), cent iron & steel res inst, beijing 100081, peoples r china;hongxianxie@163.com
关键词	Molecular Dynamic Crack Shockley Partial Dislocation Stacking Fault Single-crystal Superalloy 110 Screw Dislocations Li-2 Ordered Alloys Atomistic Simulations Computer-simulation Fault Energies Core Structure Gamma'-phase Creep Behavior
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/32449
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	H. X. Xie,C. Y. Wang,T. Yu,et al. Dislocation formation and twinning from the crack tip in Ni(3)Al: molecular dynamics simulations[J]. Chinese Physics B,2009,18(1):251-258.
APA	H. X. Xie,C. Y. Wang,T. Yu,&J. P. Du.(2009).Dislocation formation and twinning from the crack tip in Ni(3)Al: molecular dynamics simulations.Chinese Physics B,18(1),251-258.
MLA	H. X. Xie,et al."Dislocation formation and twinning from the crack tip in Ni(3)Al: molecular dynamics simulations".Chinese Physics B 18.1(2009):251-258.