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High Temperature Deformation Characteristics of Al-Zn-Mg Alloy Modified with CaO-Added Mg
Gyeong-Seo Lee1, Ji-Woon Lee1, Sang-Wook Kim1
1Department of Materials Science and Engineering, Inha University, Incheon 22212, Republic of Korea.
Abstract:
Hot torsion tests were performed on an Al-Zn-Mg alloy modified with CaO-added Mg to investigate the effects of the Mg additive on the high temperature deformation characteristics. Effective stress- strain curves and processing maps were established from the experimental results under a range of deformation conditions. The fracture strain of the CaO-added Al-Zn-Mg alloy was higher than that of the Al-Zn-Mg alloy. The CaO-added Al-Zn-Mg alloy did not show an instability region in the processing map but the commercial Al-Zn-Mg alloy exhibited adiabatic shear bands at low temperatures and at a high strain rate. The results shown in this study were attributed to the reduction of the second phase by the addition of CaO-added Mg.
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