Ca-induced Plasticity in Magnesium Alloy: EBSD Measurements and VPSC Calculations

Umer Masood Chaudry,Kotiba Hamad,Jung-Gu Kim

doi:10.3390/cryst10020067

Umer Masood Chaudry, Kotiba Hamad + Show 1 more

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https://doi.org/10.3390/cryst10020067

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Journal: Crystals	Publication Date: Jan 24, 2020
Citations: 14	License type: CC BY 4.0

Affiliation: Sungkyunkwan University

Abstract

In the present work, Ca-induced plasticity of AZ31 magnesium alloy was studied using electron backscattered diffraction (EBSD) measurements supported by viscoplastic self-consistent (VPSC) calculations. For this purpose, alloy samples were stretched to various strains (5%, 10%, and 15%) at room temperature and a strain rate of 10−3 s−1. The EBSD measurements showed a higher activity of non-basal slip system (prismatic slip) as compared to that of tension twins. The VPSC confirmed the EBSD results, where it was found that the critical resolved shear stress of the various slip systems and their corresponding activities changed during the stretching of the alloy samples.

Highlights

Due to its low density and high natural abundance, magnesium (Mg) is considered as one of the most promising metals for structural applications
The results showed that the processing by differential speed rolling (DSR) could optimize both strength and ductility in AZ31 Mg alloy, and this was related to the role of DSR in grain refinement and texture weakening of the AZ31 alloy
The enhanced ductility of the alloy is mainly related to the Ca addition and the intermetallic compounds (IMCs) that formed as a result of this addition

Summary

Introduction

Due to its low density and high natural abundance, magnesium (Mg) is considered as one of the most promising metals for structural applications. The naturally intrinsic brittleness of Mg, which is related to the hexagonal close packed (HCP) structure, limits its applicability as a structural material. In such structures, various slip families with several slip systems are usually available; those families are basal, prismatic, and pyramidal [1,2]. One way to enhance the poor ductility of Mg-based materials is by weakening the basal texture observed after a primary processing (casting and rolling, for example). A weak basal-textured AZ31 alloy has been fabricated using a warm severe plastic deformation through differential speed rolling (DSR)

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