Compression thermal deformation behavior and thermal processing diagram of AZ31B/5052 bimetallic
A unidirectional hot compression test was conducted on AZ31B/5052 bimetallic using Gleeble-3800 thermal simulation testing machine under the conditions of deformation temperature of 300-400 ℃,strain rate of 0.05-5 s-1 and deformation amount of 30％,its thermal deformation behavior was studied,and its constitutive model and thermal processing diagram were established.The results show that at the same strain rate,the peak stress of the AZ31B/5052 bimetallic decreases with the increase of deformation temperature.At the same deformation temperature,the peak stress increases with the increase of strain rate.The flow stress values calculated using the established constitutive equation is in good agreement with the experimental flow stress values(correlation coefficient r=0.9823 and average relative error AARE=4.12％),which can be used for numerical simulation of magnesium/aluminum bimetallic thermal processing processes and determination of process parameters.Based on the thermal processing diagram and line scanning pattern,the optimal thermal processing process for the AZ31B/5052 bimetallic is determined to be:deformation temperature of 380-400 ℃,and strain rate of 0.05-0.135 s-1.
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