Experimental and Fem Analysis Investigation of Various Processing Routes of the Planar Twist Channel Angular Extrusion Process

Severe Plastic Deformation (SPD) is the most appropriate top-down method for making nanocrystalline or ultrafine grained metal structures. Achieving a good distribution and higher values of equivalent plastic strain in one pass is the main parameter in severe plastic deformation processes. To solve this challenge, integrating different SPD processes is required. The planar twist channel angular extrusion process is one of the recently proposed methods of SPD as a rearrangement of two Simple Shear Extrusion (SSE) and Equal Channel Angular Pressing (ECAP) processes. In this study, Finite Element (FE) simulation of the various routes in the 2nd cycle of this method is done. Then, the micro hardness test of the processed samples was performed. Finite element analysis results illustrate that the C1, C2 ,A1, and B2 routes have the most uniform distribution of equivalent plastic strain in the cross section area of the specimen, and B2 and A1 paths have more equivalent plastic strain values. The highest non-uniform distribution of the equivalent plastic strain is illustrated in the paths B1 and D2. The results of the micro hardness test validated FEM results. Therefore, the best options for the second cycle of the PTCAE method are the paths A1 and B2.