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This paper presents the results of studies on the effects of thermal treatment on the structure, hardness and strength of a high-aluminium monotectoid ZnAl40Cu3 alloy. The alloy was tested in the following conditions: after supersaturation at a temperature of 385 °C; after supersaturation at a temperature of 385 °C and subsequent ageing at temperatures of 125, 150 and 175 °C; and after annealing at a temperature of 185 °C. The studies revealed that annealing at a temperature of 185 °C causes a decrease in hardness and strength of ZnAl40Cu3 alloy. In contrast, the highest increase in hardness and strength was obtained by “incomplete” supersaturation at a temperature of 385 °C for 10 h. The increase in hardness and strength of the ZnAl40Cu3 alloy observed in the result of “incomplete” supersaturation at a temperature of 385 °C for 10 h may be connected with, most of all, formation of a quasi-dendritic structure. It was found that ageing of supersaturated samples causes a decrease in their hardness when compared to that of the samples after supersaturation.

Influence of heat treatment on the structure, hardness and strength of ZnAl40Cu3 alloy