Abstract
A study was carried out to determine the role of Mg, Cu, Be, Ag, Ni, and Zn additives during the solution heat treatment of grain refined, Sr-modified eutectic A413.1 (Al-11.7% Si) alloy, and their consequent effect on mechanical properties. For comparison purposes, some of the alloys were also studied in the non-modified condition. The alloys were cast in the form of test bars using a steel permanent mold preheated at 425°C that provided a microstructure with an average dendrite arm spacing (DAS) of ∼22 μm. The test bars were solution heat treated at 500 ± 2°C for times up to 24 h, followed by artificial aging at 155°C for 5 h (T6 treatment). Tensile and hardness tests were carried out on the heat-treated test bars. Details of the microstructural evaluation are reported in a previous article [1].
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