In equal-channel angular pressing, it is necessary to repeat the process to achieve large strains. However, in non-equal-channel angular pressing (NECAP), the large strains can be achieved without repetition of the process. In this study, the effect of the NECAP on microstructure, mechanical properties and residual stress (RS) of widely used 6061 aluminum alloy sample was investigated. After the NECAP process, yield strength, tensile strength, hardness and uniformity of the hardness distribution increased dramatically and fracture strain and tensile toughness were significantly reduced. The effect of the NECAP on the yield strength was significantly higher than other parameters of the mechanical properties. Also, the microstructure was obtained with more uniformity and with the grain size of 18.5 times smaller relative to the initial sample. The numerical simulation results showed that by increasing friction coefficient, the plastic strain increases. In this study, a very good agreement was obtained between the results of experimental method of contour and finite element method in the RS measuring. In this paper, the RS factor (R.S.F.) was introduced to investigate the RS distribution. With the aid of this factor, one can obtain a general understanding of the RS distribution in one part. In this research, the effect of the friction coefficient on the R.S.F. in surfaces and middle cross section of the NECAPed sample was discussed.

在等通道角压中，有必要重复此过程以获得较大的应变。但是，在非等通道角挤压（NECAP）中，无需重复此过程即可获得较大的应变。在这项研究中，研究了NECAP对广泛使用的6061铝合金样品的组织，力学性能和残余应力（RS）的影响。经过NECAP处理后，屈服强度，拉伸强度，硬度和硬度分布的均匀性显着提高，断裂应变和拉伸韧性显着降低。NECAP对屈服强度的影响明显高于机械性能的其他参数。同样，获得的显微组织具有更高的均匀性，并且其晶粒尺寸比初始样品小18.5倍。数值模拟结果表明，通过增加摩擦系数，塑性应变增加。在这项研究中，轮廓测量的实验方法与有限元方法在RS测量中取得了很好的一致性。本文介绍了RS因子（RSF）以研究RS分布。借助这一因素，人们可以在一个部分中获得对RS分布的总体了解。在这项研究中，讨论了摩擦系数对NECAPed样品的表面和中截面的RSF的影响。本文介绍了RS因子（RSF）以研究RS分布。借助这一因素，人们可以在一个部分中获得对RS分布的总体了解。在这项研究中，讨论了摩擦系数对NECAPed样品的表面和中截面的RSF的影响。本文介绍了RS因子（RSF）以研究RS分布。借助这一因素，人们可以在一个部分中获得对RS分布的总体了解。在这项研究中，讨论了摩擦系数对NECAPed样品的表面和中截面的RSF的影响。