Influence of the Annealing Temperature on the Phase
Composition
of Al0.55 wt % Zr Cast Alloy

N. A. Belov*, A. N. Alabin**, and A. A. Yakovlev***

National University of Science and Technology “MISiS”, Leninskii pr. 4, Moscow, 119049 Russia

*e-mail: nikolay-belov@yandex.ru

**e-mail: alex_alabin@mail.ru

***e-mail: yakovlevalexandr@mail.ru

Abstract—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 alu-
minum solid solution in the Al–0.55% Zr–0.23% Fe–0.06% Si at t = 200–650C is calculated. It is shown that,
when using multistage annealing, the maximal hardness and conductivity are attained at t = 400–450C.

Keywords: aluminum alloys, thermal treatment, conductivity, phase composition

DOI: 10.3103/S1067821213030048

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