Влияние температуры деформации на эффект реализации высокой пластичности в ультрамелкозернистом сплаве Al-1.5Cu

Abstract

For the first time the influence of temperature of mechanical tension on the plastification effect (PE) in ultrafine-grained (UFG) Al-1.5Cu (wt.%) alloy was studied. The UFG structure in the material was formed by high pressure torsion (HPT). A significant increase in the plasticity (from ~ 3% to 22%) of the UFG alloy while maintaining high ultimate tensile strength (450 MPa) was achieved by additional treatment, including low temperature annealing and subsequent small additional HPT deformation. The temperature range of the PE implementation was revealed. It was shown that decrease of the deformation temperature leads to a gradual decrease of the PE and its disappearance at –20 oC. Cu alloying led to a significant narrowing of the range of PE implementation from low temperature side compared to the UFG commercially pure Al. Possible reasons of the influence of Cu alloying on temperature dependence of the PE are discussed.