(1. 安徽工業(yè)大學 材料科學與工程學院，馬鞍山 243002；
2. 無錫福鎂輕合金科技有限公司，無錫 214183；
3. 河南新鄉(xiāng)鐵路摩擦材料廠，新鄉(xiāng) 453002)
摘 要: 采用Gleeble-3500熱模擬試驗機對AZ31鎂合金擠壓板坯進行平面應變壓縮實驗，研究鎂合金二次變形條件下的熱變形行為。結果表明，AZ31鎂合金擠壓板坯二次變形中發(fā)生明顯的動態(tài)再結晶，進一步細化了再結晶晶粒，且二次變形削弱了擠壓板坯的(0002)基面織構強度。DEFORM 3D有限元模擬結果表明，當應變速率一定時，變形溫度是決定再結晶晶粒大小的主要因素，而當變形溫度一定時，高應變速率所引起的顯著溫升不利于應變累積，因而再結晶晶粒細化效果并不明顯。
關鍵字: 鎂合金；二次變形；動態(tài)再結晶；數(shù)值模擬
（1. School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan 243002, China;
2. Wuxi Fumei Light Alloy Technology Co., Ltd., Wuxi 214183, China;
3. Xinxiang Railway Friction Material Manufactory, Xinxiang 453002, China）
Abstract:The plain strain compression experiment of AZ31 magnesium extruded sheet was performed on thermal simulation machine Gleeble-3500 in order to investigate the secondary deformation behavior. The results show that the dynamic recrystallization occurs during the secondary deformation of AZ31 magnesium extruded sheet, resulting in the further refinement of grain size of extruded sheet and the weakening of (0002) basal texture. The numerical simulation based on DEFORM 3D shows that the recrystallized grain size depends strongly on the deformation temperature at a constant strain rate, while at a constant deformation temperature, the higher temperature increment resulted from the higher strain rate is unfavorable for the accumulation of strain and then reduces the effect of secondary deformation on the grain refinement.
Key words: magnesium alloy; secondary deformation; dynamic recrystallization; numerical simulation
