Abstract
The study presents the results of the application of a statistical analysis for the evaluation of the effect of high-melting additions introduced
into a pressure cast Al-Si alloy on the obtained level of its proof stress Rp0.2. The base Al-Si alloy used for the tests was a typical alloy used
for pressure casting grade EN AC-46000. The base alloy was enriched with high-melting additions, such as: Cr, Mo, V and W. The additions
were introduced into the base Al-Si alloy in all the possible combinations. The content of the particular high-melting addition in the Al-Si
alloy was within the scope of 0.05 to 0.50%. The investigations were performed on both the base alloy and alloy with the high-melting
element additions. Within the implementation of the studies, the values of Rp0.2 were determined for all the considered chemical compositions
of the Al-Si alloy. A database was created for the statistical analysis, containing the independent variables (chemical composition data) and
dependent variables (examined Rp0.2 values). The performed statistical analysis aimed at determining whether the examined high-melting
additions had a significant effect on the level of Rp0.2 of the Al-Si alloy as well as optimizing their contents in order to obtain the highest
values of the Al-Si alloy's proof stress Rp0.2. The analyses showed that each considered high-melting addition introduced into the Al-Si alloy
in a proper amount can cause an increase of the proof stress Rp0.2 of the alloy, and the optimal content of each examined high-melting addition
in respect of the highest obtained value of Rp0.2 equals 0.05%.
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