Boundary trend ofα1/(α1+α2) phase region
at lower Cu side in Al-Zn-Cu system①
at lower Cu side in Al-Zn-Cu system①
(School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China)
Abstract: The range of miscibility gap above 300℃at low Cu side in Al-Cu-Zn ternary system was obtained by EPMAof the designed alloys and diffusion-couples treated for equilibrium. The results about the boundary trend of theα1/(α1+α2) phase region was obtained. Theα1/(α1+α2) boundary moves towards the lower Zn side with the increase of Cu content. The results are opposite to traditional phase diagrams obtained by experiments, but consistent with recent thermodynamic calculations.
Key words: Al-Zn-Cu system; miscibility gap;α1/(α1+α2) boundary