Anisotropy of creep resistance in extruded magnesium

Creep deformation of extruded magnesium, prepared via a powder metallurgical route with a final hot extrusion, is examined in the temperature range of 473-623 K. The greatest creep resistance is observed in specimens with the stress axis parallel to the extrusion axis and the lowest at declinations between 45 degrees and 90 degrees. Most of this orientation dependence can be accounted for by the variation in the resolved shear stress on the basal slip planes. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.