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

Mohsen Taheri Andani; Aaditya Lakshmanan; Mohammadreza Karamooz-Ravari; Veera Sundararaghavan; John Allison; Amit Misra

doi:10.1038/s41598-020-59684-y

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

Sci Rep. 2020 Feb 20;10(1):3084. doi: 10.1038/s41598-020-59684-y.

Authors

Mohsen Taheri Andani^{1

2}, Aaditya Lakshmanan³, Mohammadreza Karamooz-Ravari⁴, Veera Sundararaghavan^{5

3}, John Allison⁵, Amit Misra^{4

5}

Affiliations

¹ Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI, 48105, USA. mtaheri@umich.edu.
² Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI, 48105, USA. mtaheri@umich.edu.
³ Department of Aerospace Engineering, University of Michigan, Ann Arbor, MI, 48105, USA.
⁴ Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI, 48105, USA.
⁵ Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI, 48105, USA.

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.