Title

A microstructure based model of the deformation mechanisms and flow stress during elevated temperature straining of a magnesium alloy

Publication Date

5-2011

Journal

Scripta Materialia

Volume

64

Issue

10

First Page

931

Last Page

934

Department

Mechanical Engineering

Abstract

We show that the variation of flow stress with strain rate and grain size in a magnesium alloy deformed at a constant strain rate and 450 °C can be predicted by a crystal plasticity model that includes grain boundary sliding and diffusion. The model predicts the grain size dependence of the critical strain rate that will cause a transition in deformation mechanism from dislocation creep to grain boundary sliding, and yields estimates for grain boundary fluidity and diffusivity.

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