Flow stress equation of AZ31 magnesium alloy sheet during warm tensile deformation

The uniaxial warm tensile tests were carried out under a strain rate range of 0.1–0.0001 s −1 at a temperature range of 423–573 K in order to evaluate the flow stress of AZ31 magnesium alloy sheet. The flow stress curves analyzing by Fields–Backofen constitutive equation can only give a good fit to...

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Bibliographic Details
Published in:Journal of materials processing technology 2008-11, Vol.208 (1), p.29-34
Main Authors: Cheng, Yong Qi, Zhang, Hui, Chen, Zhen Hua, Xian, Kui Feng
Format: Article
Language:English
Subjects:
AZ31 magnesium alloy sheet
Flow stress
Warm tensile deformation
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Summary:The uniaxial warm tensile tests were carried out under a strain rate range of 0.1–0.0001 s −1 at a temperature range of 423–573 K in order to evaluate the flow stress of AZ31 magnesium alloy sheet. The flow stress curves analyzing by Fields–Backofen constitutive equation can only give a good fit to the measured stress–strain relationship at the work-hardening stage. A new mathematical model containing a softening item s is used to calculate the flow stress curves. The results indicate that this modeling can approach better at the softening stage of the flow stress than that of the Fields–Backofen equation.
ISSN:0924-0136
DOI:10.1016/j.jmatprotec.2007.12.095