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Cumulative shear strain–induced preferential orientation during abnormal grain growth near fatigue crack tips of nanocrystalline Au films

Published online by Cambridge University Press:  13 January 2020

Si-Xue Zheng ,
Xue-Mei Luo Open the ORCID record for Xue-Mei Luo [Opens in a new window]  and
Guang-Ping Zhang Open the ORCID record for Guang-Ping Zhang [Opens in a new window]
Si-Xue Zheng
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; and School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
Xue-Mei Luo*
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Guang-Ping Zhang*
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
*
a)Address all correspondence to these authors. e-mail: xmluo@imr.ac.cn
b)e-mail: gpzhang@imr.ac.cn
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Abstract

A detailed electron backscatter diffraction (EBSD) characterization was utilized to investigate abnormal grain growth behavior of nanocrystalline (NC) Au films constrained by a flexible substrate under cyclic loading. Abnormally grown grains (AGGs) in front of about 15 fatigue cracks were picked out to investigate the grain reorientation behavior during abnormal grain growth in the fatigue crack tip in the cyclically deformed thin films. It shows that the AGGs exhibited 〈001〉 orientation along the loading direction, whereas grains grown far away from fatigue cracks had no significant texture change. The cyclic cumulative shear strain was found to play a key role in grain reorientation. A lattice rotation model was proposed to elucidate the grain reorientation mechanism during abnormal grain growth. Such grain reorientation behavior of NC metals was found to provide an intrinsic resistance of the NC metals to fatigue damage.

Keywords

fatiguegrain sizetexturenanocrystallinegrain growth
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 4 , 28 February 2020 , pp. 372 - 379
Copyright
Copyright © Materials Research Society 2020

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