Brittle-ductile behavior of a nanocrack in nanocrystalline Ni: A quasicontinuum study

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	Brittle-ductile behavior of a nanocrack in nanocrystalline Ni: A quasicontinuum study
	Y. F. Shao ; X. Yang ; X. Zhao ; S. Q. Wang
刊名	Chinese Physics B
	2012
卷号	21 期号:9
关键词	atomistic simulations nanocrystalline materials fracture grain boundaries multiscale simulation mechanical-properties molecular-dynamics crack tips fcc metals deformation solids fracture defects nickel
ISSN号	1674-1056
中文摘要	The effects of stacking fault energy, unstable stacking fault energy, and unstable twinning fault energy on the fracture behavior of nanocrystalline Ni are studied via quasicontinuum simulations. Two semi-empirical potentials for Ni are used to vary the values of these generalized planar fault energies. When the above three energies are reduced, a brittle-to-ductile transition of the fracture behavior is observed. In the model with higher generalized planar fault energies, a nanocrack proceeds along a grain boundary, while in the model with lower energies, the tip of the nanocrack becomes blunt. A greater twinning tendency is also observed in the more ductile model. These results indicate that the fracture toughness of nanocrystalline face-centered-cubic metals and alloys might be efficiently improved by controlling the generalized planar fault energies.
原文出处	://WOS:000308870300027
公开日期	2013-02-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/60212]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. F. Shao,X. Yang,X. Zhao,et al. Brittle-ductile behavior of a nanocrack in nanocrystalline Ni: A quasicontinuum study[J]. Chinese Physics B,2012,21(9).
APA	Y. F. Shao,X. Yang,X. Zhao,&S. Q. Wang.(2012).Brittle-ductile behavior of a nanocrack in nanocrystalline Ni: A quasicontinuum study.Chinese Physics B,21(9).
MLA	Y. F. Shao,et al."Brittle-ductile behavior of a nanocrack in nanocrystalline Ni: A quasicontinuum study".Chinese Physics B 21.9(2012).