Influence of pre-twinning on high strain rate compressive behavior of AZ31 Mg-alloys

This study aims to investigate the effect of pre-twinning on high strain rate deformation behavior of AZ31 Mg-alloy sheet. The high strain rate compressive behavior of AZ31 magnesium alloy sheet was measured in rolling direction (RD), transverse direction (TD) and normal direction (ND) by using a Sp...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2019-01, Vol.742, p.309-317
Main Authors: Wang, Ruifeng, Mao, Pingli, Liu, Yanyu, Chen, Yang, Wang, Zhi, Wang, Feng, Zhou, Le, Liu, Zheng
Format: Article
Language:English
Subjects:
Alloys
AZ31 Magnesium alloys
Compressive properties
Compressive strength
Deformation effects
EBSD
Grain refinement
Heat treating
High strain rate
High strain rates deformation
Magnesium base alloys
Mechanical behavior
Metal sheets
Rolling direction
SHBP
Split Hopkinson pressure bars
Twinning
Yield strength
Yield stress
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Summary:This study aims to investigate the effect of pre-twinning on high strain rate deformation behavior of AZ31 Mg-alloy sheet. The high strain rate compressive behavior of AZ31 magnesium alloy sheet was measured in rolling direction (RD), transverse direction (TD) and normal direction (ND) by using a Split Hopkinson Pressure Bar (SHPB). The microstructural evolution and texture during pre-compression along RD and TD have been analyzed by electron back-scatter diffraction (EBSD). The results demonstrate that pre-compression along RD and TD can promote the activation of multiple twin variants in AZ31 alloys, which can significantly improve the yield strength due to grain refinement induced by {101¯2} twinning lamellas. However, the high strain rate yield strength along ND drastically decreased after pre-twinning, which is mainly attributed to the occurrence of de-twinning. The formation of {101¯2}-{101¯2} double twins and a large number of cross-twinning lamellas, after pre-twinning of TD+RD, can effectively inhibit de-twinning behavior and increase the yield strength, when high strain rate compression is applied along ND.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2018.09.055