A new forming process for magnesium alloy sheet, namely, electromagnetic impacting medium forming (EIMF), is proposed. Medium is compressed by strong magnetic force which is produced from varied magnetic field between coil and driver sheet. Magnesium alloy sheet can be deformed by a strong force from medium. In EIMF, once impacting or more times impacting is easily implemented, that is difficulty in conventional electromagnetic forming. Effects of different discharge energy and temperature were investigated. Peak forming heights increased linearly with increasing discharge energy and temperature. Distribution of contour and thickness had been revealed. Strains could be improved by increasing temperature and discharge energy. Twice impacting process was carried out. The forming height was enhanced obviously in contrast with results obtained at once impacting. Fracture morphology and optical microstructure were analyzed. It is found that brittle fracture at room temperature and ductile fracture at 200 °C appeared. Due to high strain rate forming process, deformation mechanism (non-basal slip systems) has limit effect. And at 200 °C, twinning is also a main mechanism for AZ31 sheet deformation in EIMF. In further work, EIMF for formability of AZ31 sheet will be improved by affected the deformation mechanism.

提出了一种新的镁合金板材成形工艺，即电磁冲击介质成形（EIMF）。介质被强大的磁力压缩，该磁力是由线圈和驱动器片之间变化的磁场产生的。镁合金薄板可能会由于来自介质的强力而变形。在EIMF中，一旦实现冲击或多次冲击就容易实现，这在常规的电磁成形中是困难的。研究了不同放电能量和温度的影响。峰值形成高度随着放电能量和温度的增加而线性增加。已经揭示出轮廓和厚度的分布。可以通过提高温度和释放能量来改善菌株。进行了两次冲击过程。与一次冲击获得的结果相比，成形高度明显提高。分析了断裂形态和光学显微组织。发现在室温下出现脆性断裂，在200℃下出现延性断裂。由于高应变速率成形过程，变形机制（非基层滑移系统）的作用有限。在200°C时，孪晶也是EIMF中AZ31薄板变形的主要机理。在进一步的工作中，将通过影响变形机制来改善EIMF对AZ31板材的可成形性。孪晶也是EIMF中AZ31薄板变形的主要机制。在进一步的工作中，将通过影响变形机制来改善EIMF对AZ31板材的可成形性。孪晶也是EIMF中AZ31薄板变形的主要机制。在进一步的工作中，将通过影响变形机制来改善EIMF对AZ31板材的可成形性。