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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
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 [email protected] and Jaafar A. El-Awady at [email protected]
Address all correspondence to Steven Lavenstein at [email protected] and Jaafar A. El-Awady at [email protected]
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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
Copyright
Copyright © The Author(s) 2019 

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