Dynamic recrystallization growth kinetics of Mg-8Gd-(0,3)Sm-0.5Zr alloys
Mg-8Gd-(0,3)Sm-0.5Zr alloys were prepared by casting method and homogenized at 525 ℃ for 8 h,and then hot compression tests were conducted at temperatures ranging from 350℃to 500℃and strain rates ranging from 0.002 s-1 to 1 s-1.The true stress-strain curves of the alloy after hot compression were plotted and analyzed,and a dynamic recrystallization growth kinetics dual parameter model was constructed.The characteristics of growth kinetics curve and microstructure of the alloy were analyzed.The results show that dynamic recrystallization occurs in both alloys during hot compression.The dynamic recrystallization kinetics curves are plotted using a dual parameter model,and it is found that the volume fraction of dynamic recrystallization in the alloy rapidly increases to more than 90％at a true strain of about 0.2 during high temperature and low strain rate hot compression.By comparing and analyzing the dynamic recrystallization kinetics curves of the alloy after the addition of Sm element,it is found that Sm element promotes the progress of dynamic recrystallization,especially during high temperature and low strain rate hot compression,the promoting effect of Sm is more obvious in the early stage of deformation.
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