(上海交通大學(xué) 機(jī)械與動(dòng)力工程學(xué)院，上海 200240)
摘 要:
關(guān)鍵字: 動(dòng)態(tài)再結(jié)晶；熱粘塑性本構(gòu)；微觀組織；拉伸性能
（School of Mechanical and Power Engineering, Shanghai Jiao Tong University, Shanghai 200240, China）
Abstract:On the basis of thermoviscoplastic theory, the dynamic recrystallization (DRX) model of tension was constructed. This model was introduced into the finite element analysis of tension of AZ31 magnesium alloy sheet by changing temperature. The effect of DRX on the tensile properties of AZ31 magnesium alloy sheet was analyzed by numerical and experimental methods. The uniaxial tensile tests were conducted using a Gleeble 3500 thermal-mechanical simulator under fixed strain rate and various temperatures. The true strain-stress curves were obtained, and the microstructures of AZ31 magnesium alloy sheet were analyzed. The results show that the number of DRX grains increase gradually with the increase of temperature. The DRX grain size increases first and then decreases, and the DRX grain distribution of magnesium alloy sheet is more well-distributed. During the plastic deforming, magnesium alloy sheet is softened due to DRX and the flow stress is reduced.
Key words: dynamic recrystallization; thermoviscoplastic constitution; microstructure; tensile property
