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Grain Size Distribution Effect on Mechanical Behavior of Nanocrystalline Materials

Published online by Cambridge University Press:  15 March 2011

A.V. Sergueeva ,
N.A. Mara  and
A.K. Mukherjee
A.V. Sergueeva
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Davis, CA 95616, USA
N.A. Mara
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Davis, CA 95616, USA
A.K. Mukherjee
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Davis, CA 95616, USA
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Abstract

Grain size distribution effect on the mechanical behavior of NiTi and Vitroperm alloys were investigated. Yielding at significantly lower stresses than found in equiaxed counterparts, along with well defined strain hardening was observed in these nanocrystalline materials with large grains embedded in the matrix during tensile deformation at temperatures of 0.4Tm. At higher temperature the effect of grain size distribution on yield stress was not revealed while plasticity was increased in 50% in NiTi alloy with bimodal grain size structure.

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