Hot deformation behavior and hot processing map of Mg-4Sm-3Gd-0.5Zr alloy
Mg-4Sm-3Gd-0.5Zr alloy was prepared by melting and casting method,and homogenized at 525 ℃ for 6 h,then the hot compression experiments were conducted on the alloy under the conditions of deformation temperatures of 360-480 ℃ and strain rates of 0.01-1 s-1.The relationship between peak strain and critical strain during dynamic recrystallization of the alloy was determined,and the activation energy of hot deformation of the alloy was calculated.The hot deformation constitutive equation and hot processing map of the alloy were established and analyzed.The results show that the alloy has obvious dynamic recrystallization behavior during hot deformation,and the peak strain at which dynamic recrystallization occurs is almost 2.21 times of the critical strain.The flow stress of the alloy increases with the increase of strain rate and the decrease of deformation temperature.The hot deformation activation energy Q of the alloy calculated using the hot deformation constitutive equation is 240.039 kJ/mol.The optimal processing zone for the alloy is deformation temperature of 420-480 ℃ and a strain rate of 0.01-0.049 s-1,and the energy dissipation rate is greater than 30％within this zone but without instability.
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