Effect of Cold Plastic Deformation on Mechanical Properties of Aluminum Alloy 2519 After Ageing

Abstract

Effect of cold plastic deformation prior to ageing at 180°C on a microstructure and mechanical properties at room temperature for an AA2519 alloy was examined subjected to solution treatment and water quenching initially. It was found that cold rolling with a reduction of 15% or equal-channel angular pressing (ECAP) up to a true strain of ~1 leads to acceleration of age-hardening response of this alloy. Peak hardness values of 127, 175 and 169 HV0.2 were achieved by ageing following quenching, cold rolling and ECAP, respectively. The highest values of yield stress (YS) of 475 MPa and ultimate tensile strength (UTS) of 520 MPa, were attained after ECAP followed by ageing. The effect of cold plastic deformation prior to ageing on the precipitation behavior and its relation with mechanical properties of the AA2519 is discussed.