On the origin of ultrahigh cryogenic strength of nanocrystalline metals

Y. M. Wang; E. Ma

doi:10.1063/1.1799238

On the origin of ultrahigh cryogenic strength of nanocrystalline metals

Y. M. Wang
, E. Ma

Chem./Materials Science Directorate
Johns Hopkins University

科研成果: 期刊稿件 › 文章 › 同行评审

139 引用（Scopus）

摘要

The ultrahigh cryogenic strength of nanocrystalline metals at liquid nitrogen temperature was analyzed. Investigations show that the flow stress magnitude at 2.5 GPa was unexpected for close-packed pure metals. It was found that the strong temperature dependence attributed to the small activation volume in strain rate tests. It was concluded that grain boundary dislocation nucleation was used as the thermally activated deformation mechanism in nanocrystalline grains.

源语言	英语
页（从-至）	2750-2752
页数	3
期刊	Applied Physics Letters
卷	85
期	14
DOI	https://doi.org/10.1063/1.1799238
出版状态	已出版 - 4 10月 2004
已对外发布	是

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AB - The ultrahigh cryogenic strength of nanocrystalline metals at liquid nitrogen temperature was analyzed. Investigations show that the flow stress magnitude at 2.5 GPa was unexpected for close-packed pure metals. It was found that the strong temperature dependence attributed to the small activation volume in strain rate tests. It was concluded that grain boundary dislocation nucleation was used as the thermally activated deformation mechanism in nanocrystalline grains.

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On the origin of ultrahigh cryogenic strength of nanocrystalline metals

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