On dynamic deformation behavior of WE43 magnesium alloy sheet under shock loading conditions

In the present study, the texture evolution, microstructure and mechanical behavior of WE43 magnesium sheet at high strain rates are investigated. Samples cut along the rolling direction (RD), 45° from the RD, transverse direction (TD) and perpendicular to the RD-TD plane were tested at strain rates...

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Bibliographic Details
Published in:Materials in engineering 2014-11, Vol.63, p.552-564
Main Authors: Asgari, H., Odeshi, A.G., Szpunar, J.A.
Format: Article
Language:English
Subjects:
Activation
Anisotropy
Loads (forces)
Magnesium
Magnesium alloy sheet
Shock loading
Strain rate
Surface layer
Texture
Texture evolution
Twinning
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Summary:In the present study, the texture evolution, microstructure and mechanical behavior of WE43 magnesium sheet at high strain rates are investigated. Samples cut along the rolling direction (RD), 45° from the RD, transverse direction (TD) and perpendicular to the RD-TD plane were tested at strain rates of 800, 1200 and 1400s−1 using Split Hopkinson Pressure Bar. It is observed that after shock loading, the initial weak texture converts to a weak (00.2) basal texture in all samples. Besides, it is found that the strength and ductility increase and twinning fraction decreases with increase in strain rate. Moreover, another effect of increase in strain rate is found to be the higher activation of pyramidal 〈c+a〉 slip systems. In addition, degree of stress and strain anisotropy is low particularly at higher strain rates, which is mainly related to the weak initial texture of the samples. A viscoplastic self-consistent model with a tangent approach is used to analyze the deformation mechanism during shock loading.
ISSN:0261-3069
DOI:10.1016/j.matdes.2014.06.038