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在温度为285~380°C的条件下,采用循环镦-挤工艺成功获得AZ61镁合金的累积大塑性变形,并对铸态和循环镦-挤变形后合金的组织特征和力学性能进行研究。结果表明,在285°C的条件下,循环镦-挤变形3道次后,材料获得的累积应变为4.28,并得到了平均晶粒尺寸为3.5μm的细小均匀的微观组织。晶粒细化的主要原因是局部应变引起的动态再结晶。结果还表明,显微组织演变受温度和累积变形程度的影响。晶粒细化使循环镦-挤变形的AZ61镁合金的力学性能得到明显的改善。此外,通过室温拉伸试验揭示了循环镦-挤工艺参数与力学性能之间的关系。
The cumulative plastic deformation of AZ61 magnesium alloy was successfully obtained by cyclic upsetting and extrusion at the temperature of 285-380 ° C. The microstructure and mechanical properties of the as-cast and as-extruded alloy were studied. The results show that under the condition of 285 ° C, the cumulative strain obtained by the cycle upsetting - extrusion deformation is 4.28 and the microstructure with the average grain size of 3.5μm is obtained. The main reason for grain refinement is the dynamic recrystallization caused by local strain. The results also show that microstructure evolution is affected by temperature and the degree of cumulative deformation. The grain refinement makes the cyclic upsetting - extrusion deformation AZ61 magnesium alloy mechanical properties have been significantly improved. In addition, the relationship between cyclic upsetting and extrusion process parameters and mechanical properties was revealed by room temperature tensile test.