Workability Study on 99.04% Pure Aluminum Processed by ECAP

Abstract

This paper presents the workability of pure aluminum processed by equal channel angular pressing (ECAP) with different routes and the increasing number of passes. The experiments have been carried out to ECAP die using channel angle (2φ) of 90° and corner angle (ψ) of 20°. The ECAP samples were carried out up to three successive passes using Route A and C. The annealed and ECAPed samples were used to find out the mechanical property. Workability of the material is an important process parameter for the material to withstand up to initial cracking. The workability studies were looked into the normal compression tests on cylindrical sample machined from ECAP samples with a constant diameter of 20 mm with different aspect ratios 0.75, 1.0, and 1.5. Mechanical property and fractography studies were carried out before and after ECAP process. The observed results have been validated through Cockcroft ductile fracture criterion. An increased mechanical property with a little step down in formability of the consequent ECAP at the second and third passes of both the Routes was observed.