A multi-pass equal-channel angular pressing (helical channel angular pressing-parallel channel, HCAP-PC) is proposed to enhance process efficiency and avoid plastic deformation damage during the preparation of ultrafine-grained age hardened aluminum alloys. Multiple shear and twist deformations are provided at the single extrusion channel. The channel parameters were optimized by using grey relational analysis (GRA). An orthogonal L16-4-5 test array containing five factors (, , , and the length of L1 section) and four levels was collected to investigate the influence of channel parameters on the effective strain, the effective stress, the amount of damage and the deformation homogeneity coefficients. Based on the GRA, the grey relational coefficients and the grey relational grades were calculated to report the significant channel parameters which affect the extrusion quality and efficiency. Furthermore, according to the results of segregated grey relational grades, the contribution orders from high to low were listed as , , , and L1. The extrusion experiments were carried out with aluminum alloy 2024 after solid solution treatment and at the HCAP-PC die with geometry of 20°, 90°, 73°, 1.35 and 1d. The ultrafine-grained age hardened aluminum alloys were prepared and the process time was decreased to less than 120 min.

中文翻译：

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基于灰色关联分析的HCAP-PC提高时效铝合金的加工效率的研究

为了提高工艺效率，避免超细晶粒时效硬化铝合金制备过程中的塑性变形破坏，提出了一种多道次等通道角挤压（螺旋通道角挤压-平行通道，HCAP-PC）。在单个挤出通道处提供了多个剪切变形和扭曲变形。通过使用灰色关联分析（GRA）优化了通道参数。收集包含五个因素（，，和L1截面的长度）和四个级别的正交L16-4-5测试阵列，以研究通道参数对有效应变，有效应力，损伤程度和强度的影响。变形均匀系数。根据GRA，计算灰色关联系数和灰色关联等级，以报告影响挤出质量和效率的重要通道参数。此外，根据隔离的灰色关联等级的结果，从高到低的贡献顺序列为，，和L1。固溶处理后的铝合金2024以及几何形状为20°，90°，73°，1.35和1d的HCAP-PC模具进行了挤压实验。制备了超细晶粒时效硬化铝合金，并将加工时间缩短至少于120分钟。固溶处理后的铝合金2024以及几何形状为20°，90°，73°，1.35和1d的HCAP-PC模具进行了挤压实验。制备了超细晶粒时效硬化铝合金，并将加工时间缩短至少于120分钟。固溶处理后的铝合金2024以及几何形状为20°，90°，73°，1.35和1d的HCAP-PC模具进行了挤压实验。制备了超细晶粒时效硬化铝合金，并将加工时间缩短至少于120分钟。