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
	2012
发表期刊	Chinese Physics B
ISSN	1674-1056
卷号	21 期号:9
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.
部门归属	[zhao xing] liaoning univ technol, dept math & phys, jinzhou 121001, peoples r china. [shao yu-fei; yang xin] liaoning tech univ, dept gen studies, inst appl phys & technol, huludao 125105, peoples r china. [wang shao-qing] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.;zhao, x (reprint author), liaoning univ technol, dept math & phys, jinzhou 121001, peoples r china.;yfshao@alum.imr.ac.cn; zhao-heng-xing@126.com
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
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60212
专题	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).