Development of Microstructure and Fracture Toughness of AL-6063 Alloy Using Equal Channel Angular Extrusion

Abstract

Severe plastic deformation (SPD) is one of the processes used to refine the microstructure of materials. Equal Channel Angular Extrusion (ECAE) is the most common method of SPD. In this study, AL-6063grain refinement was performed using the Equal Channel Angular Extrusion method. The material was extruded up to 6 passes at a temperature of 200°C following route A. A suitable die sets equipped with heating elements alongside a thermometer was employed with the intention of extruding the material. Between the two channels, there was an angle of 90°. The results showed that the material grain average diameter decreased from 45μm to 2.8 μm after 6 passes of the ECAE. The Charpy test was used for measuring the fracture energy of various samples. The fracture toughness was the function of this energy. According to this experiment, the fracture toughness rose as the number of the ECAE process elevated. Moreover, the toughness improved for 90% after 6 passes of the ECAE process.

An investigation on the effects of equal channel angular pressing on the mixed‐mode fracture toughness and mechanical properties of 6063 aluminium alloy

“…Crack growth resistance increased for cracks that are perpendicular to the alignment direction and decreased for parallel cracks in comparison with undeformed samples. Nemati et al 22 measured the fracture energy of the 6-pass high temperature ECAPed specimens by using Charpy test. The fracture energy increased by the number of the passes and improved as 90% after the 6 passes.…”