RT Journal Article SR Electronic A1 Vlach, Tomáš A1 Cais, Jaromír A1 Mamoń, Filip A1 Mareš, Jakub T1 The Effect of the Solution Annealing Temperature in the Hardening Process on the Properties of Al-Si-Cu Alloys JF Manufacturing Technology Journal YR 2024 VO 24 IS 1 SP 141 OP 147 DO 10.21062/mft.2024.011 UL https://journalmt.com/artkey/mft-202401-0009.php AB This article deals with the influence of the applied solution annealing temperatures in the precipita-tion hardening process on the resulting increase in the mechanical properties of Al-Si-Cu alloy cast-ings with different copper contents in the alloy. AlSi7Cu2 and AlSi7Cu4 alloys were cast by gravity casting in a metal molds. Each of the samples was subjected to the Vickers microhardness measure-ment of a solid solution of α(Al) and Brinnel hardness measurement. Microscopic analysis and evalu-ation of the internal structure of each alloy was carried out in relation to used solution-annealing temperature.