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对7075铝合金单道次等通道转角挤压过程进行了正交试验研究,并进行了微观组织观察。试验结果表明,90°转角挤压后试样的晶粒细化效果最好。基于Zener-Hollomon参数模型,在设定初始平均晶粒尺寸40μm的前提下,采用Deform-3D软件中的Microstructure模块进行了组织演变数值模拟,分析了不同截面材料内部组织及晶粒尺寸的变化。模拟结果表明,试样头部平均晶粒尺寸为3.5μm,中部为2.4μm,尾部为29.1μm,均有不同程度的细化,其变化规律与试验结果相符合。
Orthogonal experiments were carried out on the corner extrusion process of single channel pass of 7075 aluminum alloy and the microstructure was observed. The test results show that the grain refinement effect of the sample after the 90 ° corner extrusion is the best. Based on the Zener-Hollomon parameter model, the Microstructure model in Deform-3D software was used to simulate the evolution of the microstructure and the internal structure and grain size of the different cross-section materials were analyzed under the premise of setting the initial average grain size of 40μm. The simulation results show that the average grain size of the sample head is 3.5μm, the middle part is 2.4μm and the tail part is 29.1μm, both of them have different degree of refinement. The change rule is in accordance with the test results.