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	Deforming nanocrystalline nickel at ultrahigh strain rates
	Wang YM(王艺明)
	2006
关键词	TENSILE PROPERTIES DEFORMATION COPPER STRENGTH BEHAVIOR METALS NI
英文摘要	The deformation mechanism of nanocrystalline Ni (with grain sizes in the range of 30-100 nm) at ultrahigh strain rates (> 10(7) s(-1)) was investigated. A laser-driven compression process was applied to achieve high pressures (20-70 GPa) on nanosecond timescales and thus induce high-strain-rate deformation in the nanocrystalline Ni. Postmortem transmission electron microscopy examinations revealed that the nanocrystalline structures survive the shock deformation, and that dislocation activity is a prevalent deformation mechanism for the grain sizes studied. No deformation twinning was observed even at stresses more than twice the threshold for twin formation in micron-sized polycrystals. These results agree qualitatively with molecular dynamics simulations and suggest that twinning is a difficult event in nanocrystalline Ni under shock-loading conditions. (c) 2006 American Institute of Physics.
语种	英语
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/64851]
专题	经济学院－已发表论文
推荐引用方式 GB/T 7714	Wang YM. Deforming nanocrystalline nickel at ultrahigh strain rates[J],2006.
APA	王艺明.(2006).Deforming nanocrystalline nickel at ultrahigh strain rates..
MLA	王艺明."Deforming nanocrystalline nickel at ultrahigh strain rates".(2006).

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