Hot Compression Deformation Behavior and Processing Map of Mg-8.08Gd-2.41Sm-0.3Zr Alloy
ZHU Limin1, 2, LI Quanan1, 2
1 School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023; 2 Collaborative Innovation Center of Nonferrous Metal of Henan Province, Luoyang 471023
Abstract: Mg-8.08Gd-2.41Sm-0.3Zr alloy was prepared by melting and casting method. The hot compression tests were performed on Mg-8.08Gd-2.41Sm-0.3Zr alloy after homogenizing treatment. Hot deformation behavior was investigated at the temperature ranging from 350 ℃ to 500 ℃, strain rate ranging from 0.002 s-1 to 1 s-1 and the maximum deformation of 50%. Deformation activation energy was calculated, the constitutive equation of the plastic deformation of Mg-8.08Gd-2.41Sm-0.3Zr alloy was obtained and the hot processing map was drawn. The results showed that the flow stress decrease with the increase of temperature or the decrease of the strain rate. The dynamic recover and dynamic recrystallization occur obviously during hot compression of Mg-8.08Gd-2.41Sm-0.3Zr alloy. The deformation activation energy was found to be about 213.693 kJ/mol. Two instability zones of flow behavior are established as follows: T=430—500 ℃, $\dot{\varepsilon}$=0.37—1 s-1 and T=350—390 ℃, $\dot{\varepsilon}$ =0.006—1 s-1. The efficiency of power dissipation was above 30% when deformed at T=370—430 ℃, $\dot{\varepsilon}$ =0.37—1 s-1 ; T=390—500 ℃, $\dot{\varepsilon}$=0.006—0.37 s-1 and T=350—500 ℃, $\dot{\varepsilon}$ =0.002—0.006 s-1. The three areas were the optional processing parameters of hot deformation.
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2018, Vol. 32 
