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Anomalous Strain Rate Sensitivity of Nanocrystalline Ni Induced by Rolling Deformation

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Abstract:

The strain rate sensitivity of rolled nanocrystalline (NC) Ni was studied by nanoindentation. The grain continuously grows from 20 nm to 92 nm after rolling deformation. The stress driven grain boundary migration accompanied by dislocation emission leads to the grain growth. The strain sensitivity first increase and then decrease with the increased rolling strain, which has a similar variation of dislocation density in rolled NC Ni. The remarkable shift of rate sensitivity is attributed to the dislocation supported grain boundary mediated process.

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Periodical:

Materials Science Forum (Volume 816)

Pages:

143-146

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.816.143

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Online since:

April 2015

Authors:

Z.H. Cao, Xiang Kang Meng

Keywords:

Rolling , Nanocrystalline, Nanoindentation, Rate Sensitivity

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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