对挤压态ZE10镁合金在300～400℃及应变速率10-4～10-2s-1条件下进行了超塑性拉伸试验研究.结果表明:晶粒约为5μm的ZE10镁合金挤压材,在350℃及应变速率为4.80×10-3s-1条件下即可获得330%的较大伸长率,在5.55×10-4s-1应变速率下,可获得364%的最大伸长率.在350℃以应变速率4.80×10-3s-1拉伸,在变形初始阶段伸长量为50%时,合金的晶粒尺寸为2.8μm,当试样拉伸至断裂时,晶粒尺寸为4.2μm.说明在变形过程中具有动态再结晶的发生,而且晶粒长大趋势较小.试样拉断时,断口具有典型的空洞形貌特征.
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