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Static recrystallization process comparison of AZ31 magnesium alloy deformed by cold compression and cold forging

LIU Yu 1,2,LIU Tian-mo 2 1 National Key Laboratory for Nuclear Fuel and Materials,Nuclear Power Institute of P.R.China,Chengdu 610041,P.R.China 2 National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400045,P.R.China  
We deformed AZ31 magnesium alloys by cold forging and cold compression process,and investigated their static recrystallization kinetics during the annealing process.The results demonstrate that the relationship between the annealing time and the fraction of recrystal grains can be described by the Johnson-Mehl-Avrami-Kolmogorov(JMAK)equation.Based on the kinetics analysis,we calculated that the activation energy of recrystallization by cold forging and cold compression were about 53.5 kJ/mol and 85.0 kJ/mol,respectively.The activation energy of cold compression process was higher than that of the cold forging process because the latter had high-rate deformation,which caused more energy storage during deformation.
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