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Effect of temperature on the suppression of twinning in textured magnesium

Published online by Cambridge University Press:  05 August 2019

Roshan Plamthottam ,
Steven Lavenstein  and
Jaafar A. El-Awady
Roshan Plamthottam
Affiliation:
Department of Mechanical Engineering, Whiting School of Engineering, The Johns Hopkins University, Baltimore, MD 21218-2682, USA
Steven Lavenstein*
Affiliation:
Department of Mechanical Engineering, Whiting School of Engineering, The Johns Hopkins University, Baltimore, MD 21218-2682, USA
Jaafar A. El-Awady*
Affiliation:
Department of Mechanical Engineering, Whiting School of Engineering, The Johns Hopkins University, Baltimore, MD 21218-2682, USA Department of Materials Science and Engineering, Whiting School of Engineering, The Johns Hopkins University, Baltimore, MD 21218-2682, USA
*
Address all correspondence to Steven Lavenstein at stevenl@jhu.edu and Jaafar A. El-Awady at jelawady@jhu.edu
Address all correspondence to Steven Lavenstein at stevenl@jhu.edu and Jaafar A. El-Awady at jelawady@jhu.edu
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Abstract

In this work, the effect of temperature, in the range of 25 to 250 °C, on deformation twinning in textured polycrystalline pure magnesium (Mg) was investigated. Compression loading was applied perpendicular to the c-axis texture direction. The yield strength and strain hardening rate are shown to drastically decrease with increasing temperature with total suppression of twinning at 200 °C. This behavior is attributed to the decrease in the critical resolved shear stress for prismatic slip and temperature insensitivity of tensile twinning. These results provide a first step in fundamentally understanding the deformation of Mg at elevated temperatures and quantify the mechanisms that lead to their improved formability at elevated temperatures.

Type
Research Letters
Information
MRS Communications , Volume 9 , Issue 3 , September 2019 , pp. 1093 - 1097
Copyright
Copyright © The Author(s) 2019 

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