Effect of Cu addition on the $alpha;1+$alpha;2 miscibility gap of the Al?Zn system

Abstract

The effect of the Cu addition on the ( α 1 + α 2 ) miscibility gap of the Al–Zn binary system was studied by using diffusion couple technique. The Zn concentrations in both α 1 and α 2 phases are decreased due to the small addition of Cu, and the Cu element is enriched in the α 2 phase, resulting in both α 1 /( α 1 + α 2 ) and ( α 1 + α 2 )/ α 2 phase boundaries of the miscibility gap shifting to the Al-rich corner in the Al–Zn–Cu ternary system.