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Elucidating the kinetics of twin boundaries from thermal fluctuations

Published online by Cambridge University Press:  24 September 2013

Dengke Chen  and
Yashashree Kulkarni
Dengke Chen
Affiliation:
Department of Mechanical Engineering, University of Houston, Houston, Texas 77204
Yashashree Kulkarni*
Affiliation:
Department of Mechanical Engineering, University of Houston, Houston, Texas 77204
*
Address all correspondence to Yashashree Kulkarni at[email protected]
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Abstract

There is compelling evidence for the critical role of twin boundaries (TBs) in imparting the extraordinary combination of strength and ductility to nanotwinned metals. Here, we investigate the thermal fluctuations of TBs in face-centered-cubic metals to elucidate the deformation mechanisms governing their kinetic properties using molecular dynamics simulations. Our results show that the TB motion is strongly coupled to shear deformation up to 0.95 homologous temperature. A rather unexpected observation is that coherent TBs do not exhibit any capillarity-induced fluctuations even at high temperatures, in sharp contrast to other high-angle grain boundaries.

Type
Research Letters
Information
MRS Communications , Volume 3 , Issue 4 , December 2013 , pp. 241 - 244
Copyright
Copyright © Materials Research Society 2013 

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