Abstract
In the present article, influences of the heat treatment, the stress and the temperature were analyzed on the AlSi12CuNiMg aluminum alloy behavior under force-controlled creep loading. For this objective, high-temperature creep experiments were done at different stress levels and various temperatures on both as-cast and heat-treated samples. Then, the sensitivity analysis was performed by the MINITAB software on experimental data. Obtained results implied that the minimum strain rate and the fracture strain were affected by the heat treatment and the stress. However, for the creep lifetime, no significant influence of parameters was seen. The fracture surface investigation by the field-emission scanning electron microscopy indicated that both materials, with and without heat treatments had the similar brittle fracture behavior, due to quasi-cleavage marks. The heat treatment changed the fracture path in the aluminum alloy, from the intermetallic phase to Si particles. Moreover, in heat-treated samples, the creep lifetime increased at least 63%. In addition, the minimum strain rate decreased at least 44%, by the heat treatment.
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