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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