Mechanical properties of AlSil2 alloy with aluminium bronze

Abstract

One of the most common castings applied in industrial production is aluminum-silicon alloy (ca. 12 % Si). Non-modified Al-Si alloy is characterized by coarse-grained structure, responsible for its poor physicochemical properties. The microstructure and mechanical properties of hyper-eutectic silumins may be improved by modification with chemical elements and technological processing.This paper presents the research of treatment AlSil2 alloy with composition CuA110Fe3Mn2 + A112Si+CuA110Fe3Mn2 + Cu in different ranges. The experiments was conducted by a factor plan 23 for three independent variables. The main addition was aluminum bronze, as well as pure or melted with raw alloy and pure Cu. The effect of the tested modifiers on the microstructure and mechanical properties of the AlSil2 alloy was presented in figures. All analyzed parameters of the hypo-eutectic AlSil2 alloy with the tested mixtures are improved. Based on the analysis of the study results it was found that the microstructure and mechanical properties of the tested alloy are determined through the contents and chemical composition of mixtures introduced to the alloy. Pre-melting aluminum bronze has been found to be important for increasing the effectiveness of its impact on the microstructure and the investigated mechanical properties. Grain refinement was observed, and eutectic AlSil2 silicon had oval morphology with smaller size.