Effects of Temperature and Strain Rate on the High-Temperature Workability of Strip-Cast Mg-3Al-1Zn Alloy
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In this study, high-temperature workability of a strip-cast Mg-3Al-1Zn (AZ31) alloy was investigated on the basis of the processing map and microstructural analysis. To obtain the processing map, a series of isothermal compression tests was carried out up to a strain of 0.5 at temperatures of 473 to 673 K and strain rates of 0.01 to 10 s−1. It was found that the maximum efficiency indicating the optimum processing condition was obtained at 573 K and 10 s−1, and the processing instability occurred around the region of 473 K and 0.01 s−1. The possible high-temperature deformation mechanisms were also discussed in relation to initial texture development and twin formation.
KeywordsAZ31 Alloy Critical Resolve Shear Stress Basal Slip Twin Formation Pyramidal Plane
This work was supported by a Korea Science and Engineering Foundation (KOSEF) grant funded by the Korean government (MOST) (Grant No. R0A-2003-000-10309-0).
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