Grain size dependent strain rate sensitivity in nanocrystalline body-centered cubic metal thin films

Q. Zhou; J. Zhao; J. Y. Xie; F. Wang; P. Huang; T. J. Lu; K. W. Xu

doi:10.1016/j.msea.2014.04.080

Grain size dependent strain rate sensitivity in nanocrystalline body-centered cubic metal thin films

Q. Zhou, J. Zhao, J. Y. Xie, F. Wang, P. Huang, T. J. Lu, K. W. Xu

Xi'an Jiaotong University

Research output: Contribution to journal › Article › peer-review

50 Scopus citations

Abstract

The strain rate sensitivity (m) and activation volume (v^*) of three nanocrystalline (NC) body-centered cubic (bcc) metals, i.e., W, Mo and Ta, with various grain sizes were evaluated by nanoindentation testing. Opposite to the conventional trend that NC bcc metals exhibit reduced m as the grain size was decreased, elevated m was observed as the grain size was reduced from ~90nm to ~30nm for all the samples concerned. It was proposed that the unusual variation trends of m for NC bcc metals were dominated by GB-related mechanisms when the grain size drops below a critical value.

Original language	English
Pages (from-to)	184-189
Number of pages	6
Journal	Materials Science and Engineering: A
Volume	608
DOIs	https://doi.org/10.1016/j.msea.2014.04.080
State	Published - 1 Jul 2014
Externally published	Yes

Keywords

Grain size dependence
Nanocrystalline
Nanoindentation
Strain rate sensitivity

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10.1016/j.msea.2014.04.080

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title = "Grain size dependent strain rate sensitivity in nanocrystalline body-centered cubic metal thin films",

abstract = "The strain rate sensitivity (m) and activation volume (v*) of three nanocrystalline (NC) body-centered cubic (bcc) metals, i.e., W, Mo and Ta, with various grain sizes were evaluated by nanoindentation testing. Opposite to the conventional trend that NC bcc metals exhibit reduced m as the grain size was decreased, elevated m was observed as the grain size was reduced from ~90nm to ~30nm for all the samples concerned. It was proposed that the unusual variation trends of m for NC bcc metals were dominated by GB-related mechanisms when the grain size drops below a critical value.",

keywords = "Grain size dependence, Nanocrystalline, Nanoindentation, Strain rate sensitivity",

author = "Q. Zhou and J. Zhao and Xie, {J. Y.} and F. Wang and P. Huang and Lu, {T. J.} and Xu, {K. W.}",

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doi = "10.1016/j.msea.2014.04.080",

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T1 - Grain size dependent strain rate sensitivity in nanocrystalline body-centered cubic metal thin films

AU - Zhou, Q.

AU - Zhao, J.

AU - Xie, J. Y.

AU - Wang, F.

AU - Huang, P.

AU - Lu, T. J.

AU - Xu, K. W.

PY - 2014/7/1

Y1 - 2014/7/1

N2 - The strain rate sensitivity (m) and activation volume (v*) of three nanocrystalline (NC) body-centered cubic (bcc) metals, i.e., W, Mo and Ta, with various grain sizes were evaluated by nanoindentation testing. Opposite to the conventional trend that NC bcc metals exhibit reduced m as the grain size was decreased, elevated m was observed as the grain size was reduced from ~90nm to ~30nm for all the samples concerned. It was proposed that the unusual variation trends of m for NC bcc metals were dominated by GB-related mechanisms when the grain size drops below a critical value.

AB - The strain rate sensitivity (m) and activation volume (v*) of three nanocrystalline (NC) body-centered cubic (bcc) metals, i.e., W, Mo and Ta, with various grain sizes were evaluated by nanoindentation testing. Opposite to the conventional trend that NC bcc metals exhibit reduced m as the grain size was decreased, elevated m was observed as the grain size was reduced from ~90nm to ~30nm for all the samples concerned. It was proposed that the unusual variation trends of m for NC bcc metals were dominated by GB-related mechanisms when the grain size drops below a critical value.

KW - Grain size dependence

KW - Nanocrystalline

KW - Nanoindentation

KW - Strain rate sensitivity

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DO - 10.1016/j.msea.2014.04.080

M3 - 文章

AN - SCOPUS:84900035184

SN - 0921-5093

VL - 608

SP - 184

EP - 189

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

ER -

Grain size dependent strain rate sensitivity in nanocrystalline body-centered cubic metal thin films

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Keywords

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