Shape of Moving Grain Boundary and its Influence on Grain Boundary Motion in Zinc

Vera G. Sursaeva; Boris B. Straumal

doi:10.4028/www.scientific.net/DDF.249.183

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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vol. 249Shape of Moving Grain Boundary and its Influence...

Shape of Moving Grain Boundary and its Influence on Grain Boundary Motion in Zinc

Abstract:

The migration of individual special [ ] 0 1 10 tilt grain boundary (GB) with Σ =15 and misorientation angle 29° in Zn bicrystal have been investigated. The stationary shape of migrating GB has been studied and the migration rate has been measured by optical microscopy in situ between 558 and 683 K using polarized light. In certain experimental runs the migrating GB is faceted and moves thermally activated. Its kinetics follows the Arrhenius type dependence despite the fact that shape of moving GB depends on temperature. After detachment from impurity cloud the [ ] 0 1 10 tilt GB migrates activationless in the temperature interval 618÷683 K. The detachment temperature is 618 K. The non-physically high value of the apparent migration activation enthalpy can appear due to the change of GB shape from faceted to smooth and back.

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Defect and Diffusion Forum (Volume 249)

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183-188

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https://doi.org/10.4028/www.scientific.net/DDF.249.183

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Online since:

January 2006

Authors:

Vera G. Sursaeva, Boris B. Straumal

Keywords:

Grain Boundary Faceting, Grain Boundary Migration, Grain Boundary Shape, Zinc

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