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A quantitative study of stress fields ahead of a slip band blocked by a grain boundary in unalloyed magnesium
Mohsen Taheri Andani1,2, Aaditya Lakshmanan3, Mohammadreza Karamooz-Ravari4
1Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI, 48105, USA. mtaheri@umich.edu.
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.
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