对AZ31镁合金在400℃条件下的轧制工艺进行了研究,在不同压下量、不同道次条件下分别进行了轧制实验,并对轧制后AZ31板材的组织和力学性能进行了研究.实验结果表明:在400℃条件下,以小变形量轧制,每道次压下量为1mm时,较好的加工工艺条件为轧制到第8道次,累积变形量50％；每道次轧制压下量为2mm时,较好的加工工艺条件为轧制到第2道次,累积变形量为25％；AZ31镁合金在大变形量下轧制易产生裂纹,裂纹的产生可能是由于随着累积变形量增加,内应力激增,在难变形的硬取向晶粒区或第二相处产生应力集中,萌生裂纹.裂纹尖端扩展经过的区域变形量较大,因而裂纹两侧存在再结晶细晶区域.%The rolling processes of the AZ31 magnesium alloy at 400℃ were studied. And the micro-structure and mechanical properties of the sheets rolled under the condition of different reduction and passes were investigated. The results show that in 410℃, when the reduction per pass of rolling is lmm, the excellent conditions of process rolling is 8th, and the total deformation is 50% ; when the reduction per pass of rolling is 2mm, 2nd is the outstanding condition of process rolling and the total deformation of 25%. It is easy for AZ31 magnesium alloy under large deformation to cause the cracks, which is due to that the stress is increased intensely when the accumulated deformation is added. The stress concentration in some areas, such as the hard orientation and deformation or the second part, causes the crack. Because of the large the deformation in these regions. Moreover, the recrystallized grain size in these regions is very fine.
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