Kvantitatívne hodnotenie náchylnosti Al-Si-Cu-Mg zliatiny s prídavkom titánu na vznik trhlín za tepla

This study presents a quantitative evaluation of the effect of titanium (Ti) additions on the hot-tearing susceptibility of the AlSi5Cu2Mg aluminium alloy. The AlSi5Cu2Mg aluminium alloy is used in the production of highly stressed cylinder head castings and is characterized by an increased susceptibility to hot tears. The main objective of the study was to determine the extent to which grain refinement of the aluminium alloy with an excessive amount of Ti affects its susceptibility to hot tears. Thermal analysis was performed to characterize the solidification behaviour of the experimental alloys. Grain refinement was evaluated metallographically by measuring the Dendrite Arm Spacing (DAS) index. The results confirmed that the addition of titanium led to a decrease in the hot tearing susceptibility of the AlSi5Cu2Mg alloy.