The Effects of the Addition of Small Amounts of the Third Elements, Ag, Si, or Mg, on the Solvus Temperature of G.P. Zones in an Al-6.8 at%Zn Alloy

Abstract

In previous work the method for determination of the solvus temperature of G.P. zones in a binary Al-Zn alloy by means of the X-ray small-angle scattering method was described. Also, it was shown that the determined solvus temperature coincided with the results obtained by electrical resistivity and transmission electron microscopy experiments. In the present paper the small-angle scattering method was used to determine the solvus temperatures of the zones for Al-6.8 at%Zn alloys containing 0.1 at%Ag, Si and Mg, respectively. It was found that the addition of Ag or Mg increased the solvus temperature of the binary alloy, but Si had no remarkable effect on it. These results were discussed in terms of the interaction between these third elements and the Zn and Al atoms.