Equal-Channel Angular Pressing (ECAP) was carried out on 7075 aluminum alloy with a process route of Bc mode, thus, achieving the aims of refining crystal grains and improving alloy plasticity. To save cost and optimize the ECAP process, DEFORM finite element simulation of the ECAP extrusion process was conducted to determine the ratio of die shear Angle to extrusion. The results show that the mold optimum process parameters are 135° for the shear angle ( Φ ) and λ = 2 the extrusion ratio. The deformation and processing stability of the alloy at the same time met the requirements. From the simulation and experimental results of the ECAP sample, the grain size of 7075 aluminum alloy after Bc-ECAP was obviously refined from 17.311 to 9.310 μm, and the grain shape more round. The equiaxed property of the grain was also improved, and the tissue distribution more uniform. Even though the strength of 7075 aluminum alloy slightly decreased, its plasticity increased significantly from 9.9 to 18.6%.

中文翻译：

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挤压-Bc ECA工艺参数优化及其对7075铝合金组织和性能的影响

采用Bc模式的工艺路线对7075铝合金进行等通道角挤压（ECAP），从而达到细化晶粒和提高合金塑性的目的。为了节省成本和优化 ECAP 工艺，对 ECAP 挤出过程进行了 DEFORM 有限元模拟，以确定模具剪切角与挤出的比率。结果表明，模具的最佳工艺参数为剪切角 (Φ) 为 135°，挤出比为 λ = 2。同时合金的变形和加工稳定性满足要求。从 ECAP 样品的模拟和实验结果来看，Bc-ECAP 后 7075 铝合金的晶粒尺寸明显由 17.311 细化至 9.310 μm，且晶粒形状更圆。晶粒的等轴性也得到改善，组织分布更均匀。尽管7075铝合金的强度略有下降，但其塑性却从9.9%显着提高到18.6%。