Magnetically driven migration of specific planar grain boundaries in Zn bicrystals

Magnetically driven migration of planar < 10 (1) over bar0 > tilt grain boundaries with various misorientations in high purity zinc bicrystals was measured in situ by means of a specially designed polarization microscopy probe. The absolute grain boundary mobility and its temperature dependence were measured in the regime between 330 and 415 degrees C. The results revealed that there is a pronounced misorientation dependence of grain boundary mobility in the investigated angular range. The migration activation enthalpy was found to vary between 1.18 and 2.15 eV. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.