Grain refinement, microhardness distribution, strain hardening behaviour and mechanical proprieties of RD-ECAPed AA 1050

Downloads

Authors

  • A. Halimi École Militaire Polytechnique, Algeria
  • L. Hemmouche École Militaire Polytechnique, Algeria
  • I.E. Chettah École Militaire Polytechnique, Algeria
  • Z.A. Louchene École Militaire Polytechnique, Algeria

Abstract

This study aims to investigate the evolution of mechanical and microstructural characteristics of the 1050 aluminium alloy processed by Rotary Die Equal Channel Angular Pressing (RD-ECAP). The RD-ECAPed specimens were analysed after each pass using optical microscopy, quasi-static compression test and microhardness measurements. The results revealed a reduction in grain size from 29 μm before the RD-ECAP process to a minimum value of 2 μm at the second pass, corresponding to the maximum value of compressive yield strength, reaching 184MPa. Furthermore, there was an increase in hardness from 30 Hv to 63 Hv with a homogeneous distribution along the longitudinal surface, especially in the initial four RD-ECAP passes. Additionally, the appearance of a 45° shear plane was observed at the last fifth pass, coinciding with the region of maximum microhardness.

Keywords:

aluminium alloys, Rotary Die Equal Channel Angular Pressing, microstructure, longitudinal microhardness, compression test

Most read articles by the same author(s)