EFFECT OF HEAT TREATMENT ON STRUCTURE AND PROPERTIES OF ALUMINIUM-NICKEL BRONZE

The effect of heat treatment on structure and mechanical properties of B1044 (CuAl10Fe4Ni4) alloy was investigated. In the examined alloy, the content of aluminium, iron and nickel results in the formation of structure comprised in a boundary system between the regions of α + α2 + β’ and β’ + β1’ + α2 with the presence of γ2 phase formed due to eutectoid transfomation, affecting the level of mechanical properties. Before quenching, the specimens were preheated (solutioning heat treatment) for 2 h at 950°C, and different variants of cooling in water, oil and air were applied next. Some quenched specimens were also subjected to ageing from 500 or 700°C after 6 h heating and cooling with furnace and in the air. Very interesting results were obtained regarding both mechanical (Rm, R0,2) and plastic (A, Z) properties. Tests in the solid state were carried out using a dilatometer and differential calorimeter.

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