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In the dissertation it has been shown, that so called "time-thermal treatment" (TTT) of the alloy in liquid state, as overheating the metal with around 250°C above the Tliq. and detaining it in this temperature for around 30 minutes, improves the mechanical properties (HB, Rm, R0,2). It was ascertained, that overheating the AlSi17Cu5Mg alloy aids the modification, resulting with microcrystalline structure. Uniform arrangement of the Si primeval crystals in the warp, and α(Al) solution type,doi:10.1515/afe-2015-0014 fatcat:5wibnl5ns5dkje65cbjuwgtgta