Effect of annealing treatment on the mechanical properties and corrosion behaviors of 01570 aluminum alloy

Abstract

01570 aluminum alloy was cold rolled and annealed at different temperatures, and their microstructure, mechanical properties, pitting and stress corrosion cracking (SCC) behaviors were observed and determined by scanning electron microscopy (SEM), transmission electron microscopy (TEM), immersion test, slow strain rate tensile (SSRT), and constant loading tests. The results reveal that the dislocations within the grains of alloy 01570 are transformed from dislocation tangles to dislocation walls and subgrains as the treatment varies from the cold rolled temper to the annealed tempers; at the same time, the tensile strength and SCC resistance of alloy 01570 are increased and the elongation is decreased, whereas the corrosion rate is negligibly influenced by the annealing treatments. Therefore, the annealed at 300 °C temper can be selected as the optimum heat treatment for the practical application of alloy 01570.