Influence of the Annealing Temperature on the Phase Composition of Al-0.55 wt % Zr Cast Alloy

摘要

The influence of temperature on the phase composition of a cast aluminum alloy which contains 0.55% Zr, 0.23% Fe, and 0.06% Si is investigated in order to substantiate the optimal annealing modes using the Thermo-Calc program. The phase composition is determined and the equilibrium compositions of the aluminum solid solution in the Al-0.55% Zr-0.23% Fe-0.06% Si at t = 200-650℃ is calculated. It is shown that, when using multistage annealing, the maximal hardness and conductivity are attained at t = 400-450℃.