Microstructure evolution of alumina dispersion strengthened copper alloy deformed under different conditions

Abstract

Microstructure and texture evolution of Cu–0.23%Al2O3 dispersion strengthened copper alloy, deformed at room temperature or cryogenic temperature, were investigated. The main textures in hot-extruded specimen were Brass {011} <211> and Cube {100} <100>. Textures of Brass {011} <211> and Goss {011} <100> were observed in specimen after deformation at room temperature; while textures of Brass {011} <211>, Goss {011} <100> and S {123} <634> were detected after deformation at cryogenic temperature. It is believed that the additional Al2O3 nanoparticles can result in dislocation pinning effect, which can further lead to the suppression of dislocations cross-slip. While in the specimen deformed at cryogenic temperature, both pinning effect and cryogenic temperature are responsible for the formation of Brass, Goss and S textures.