A quantitative study of stress fields ahead of a slip band blocked by a grain boundary in unalloyed magnesium.

ABSTRACT: Stress localization ahead of a slip band blocked by a grain boundary is measured for three different grain boundaries in unalloyed Mg using high-resolution electron backscatter diffraction (HR-EBSD). The results are compared with a theoretical dislocation pile-up model, from which slip system resistance and micro-Hall-Petch coefficients for different grain boundary types are deduced. The results indicate that grain boundary character plays a crucial role in determining micro-Hall-Petch coefficients, which can be used to strengthen classical crystal plasticity constitutive models to make predictions linked to the effect of grain boundary strengthening.

SUBMITTER: Andani MT 

PROVIDER: S-EPMC7033223 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature