Experimental Research on Dynamic Recrystallization of 3003 Aluminum Alloy

The 3003 aluminum alloy was deformed by isothermal compression in the range of deformation temperature 300-500℃ at strain rate 0.01-10.0s-1 using Gleeble-1500 thermal simulator.The strain-hardening rate could be obtained from true stress-true strain curves,and the recrystallization average grain size was measured using the intercept method.The results show that the critical strain ec increases with parameter Z increasing,the critical conditions for onset of dynamic recrystallization(DRX) is eec=7.28×10-5Z0.1661.The average recrystallization grain size increases as deformation temperature increases and the strain rate decreases,which can be described as lndave=-0.0824lnZ+4.9532.The investigated alloy is sensitive to positive strain rate under the experimental conditions.The true stress increases as the deformation temperature decreases and the strain rate increases.The peak stress increases with the average recrystallization grain size decreasing,which meets with the law of Hall-Petch: lnσm=-0.9378lndave+6.5232.