研究了AZ31镁合金在挤压过程中长条晶粒的形成机理、挤压工艺对形成长条晶粒的影响以及长条状晶粒对室温拉伸变形断裂的影响。为消除长条晶粒,进行了不同工艺条件下的退火处理。结果表明：在挤压比为4.5时,长条状晶粒比较粗大,利用退火处理无法消除;当挤压比提高到10.1时,长条状晶粒比较狭窄,利用退火处理能有效地改善组织均匀性,较好的消除长条晶粒,其平均晶粒尺寸大约为20μm。
Mechanism of elongated grains formation during extrusion and effect of extrusion process on the elongated grains were investigated.Based on tensile tests at room temperature,the influence of elongated grains on fracture behavior of the alloy was also discussed.Different processes of annealing treatment were carried out to eliminate elongated grains in the extruded alloy with different extrution ratios.The results show that the elongated gains are coarser after extrusion at extrusion ratio of 4.5,and utilizing annealing treatment can not eliminate the elongated grains.However,elongated grains are much narrower when extrusion ratio reaches 10.1,utilizing annealing treatment can improve the microstructure homogenization effectively,the elongated grains are almost eliminated and the average size of final grains is about 20 μm.
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