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Enhancement of strain-rate sensitivity and shear yield strength of a magnesium alloy processed by high-pressure torsion

Choi, In-Chul and Lee, Dong-Hyun and Ahn, Byungmin and Durst, Karsten and Kawasaki, Megumi and Langdon, Terence G. and Jang, Jae-il (2015):
Enhancement of strain-rate sensitivity and shear yield strength of a magnesium alloy processed by high-pressure torsion.
In: Scripta Materialia, PERGAMON-ELSEVIER SCIENCE LTD, pp. 44-47, 94, ISSN 13596462, [Online-Edition: http://dx.doi.org/10.1016/j.scriptamat.2014.09.014],
[Article]

Abstract

A Mg-Zn-Zr alloy was processed by high-pressure torsion for up to 2 turns at room temperature to produce significant grain refinement together with enhanced plasticity and strength. Measurements were performed to determine the strain-rate sensitivity, shear yield strength and activation volume as a function of the processing conditions. The results suggest there is a significant contribution from grain boundary sliding to the flow process and the onset of plasticity is associated with heterogeneous dislocation nucleation.

Item Type: Article
Erschienen: 2015
Creators: Choi, In-Chul and Lee, Dong-Hyun and Ahn, Byungmin and Durst, Karsten and Kawasaki, Megumi and Langdon, Terence G. and Jang, Jae-il
Title: Enhancement of strain-rate sensitivity and shear yield strength of a magnesium alloy processed by high-pressure torsion
Language: English
Abstract:

A Mg-Zn-Zr alloy was processed by high-pressure torsion for up to 2 turns at room temperature to produce significant grain refinement together with enhanced plasticity and strength. Measurements were performed to determine the strain-rate sensitivity, shear yield strength and activation volume as a function of the processing conditions. The results suggest there is a significant contribution from grain boundary sliding to the flow process and the onset of plasticity is associated with heterogeneous dislocation nucleation.

Journal or Publication Title: Scripta Materialia
Volume: 94
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Uncontrolled Keywords: Grain boundary sliding, High-pressure torsion, Magnesium alloy, Strain-rate sensitivity, Yielding
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 09 Mar 2015 08:49
Official URL: http://dx.doi.org/10.1016/j.scriptamat.2014.09.014
Identification Number: doi:10.1016/j.scriptamat.2014.09.014
Funders: Research at Hanyang University was supported in part by the HR Development program (No. 20134030200360) of the KETEP grant funded by the Korean government (MOTE) and in part by the NRF grant (No. 2013R1A1A2A10058551) funded by the Korean Government (MSIP), Work at Ajou University was supported by the Basic Science Research Program through NRF funded by MSIP (No. 2012R1A1A1012983)., Research in the UK was supported by the European Research Council under ERC Grant Agreement No. 267464-SPDMETALS.
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