不同轧制工艺对AZ31镁合金薄板室温成形性能的影响

Effects of rolling technology on forming properties of AZ31 magnesium alloy sheets at room temperature

采用常规轧制(NR)、异步轧制(DSR)和交叉轧制(CR)3种不同工艺来获得AZ31镁合金板材并进行室温成形性能的研究。结果表明:AZ31镁合金板材的综合力学性能不仅与晶粒尺寸有关,还与晶粒取向有关。基面织构的减弱可明显提高板材的胀形性能。异步轧制明显降低板材基面织构强度,使板材室温冲压性能得到提高。交叉轧制使晶粒显著细化,基面织构增强,提高了板材的力学性能,却降低其冲压成形性能;同时交叉轧制可以减弱板材各向异性。研究结果为改善镁合金室温塑性与成形性能提供了理论依据和新思路。

According to the characteristics of poor formability of AZ31 magnesium alloy sheets at room temperature,the AZ31 magnesium alloy sheets are obtained by normal rolling(NR),differential speed rolling(DSR) and cross rolling(CR),and the forming properties at room temperature were investigated.The results show that the mechanical properties of AZ31 magnesium alloy sheets depend on not only the grain size,but also the grain orientation.The weakening of the intensity of basal texture can significantly improve the bulging forming property,the asynchronism rolling significantly reduce the intensity of basal texture and improves the performance of stamping at room temperature.The cross rolling significantly refines the grain size,enhances the intensity of basal texture and improves the mechanical properties of the sheets,but reduces the performance of stamping forming.On the other hand,the cross rolling reduces the anisotropy of the sheets.The results provide a theoretical basis and new method for the improvement of the ductility and formability of magnesium alloy sheets at room temperature.