Е-Публикации
Технически университет - София

Abstract: The hypereutectic aluminum-silicon alloys AlSi25Cu4Cr and AlSi25Cu5Cr were modified with different concentrations of phosphorus – 0.04%, 0.06%, 0.08% and 0.1%. What was determined was the concentrations of the modifier phosphorus with which structures ensuring increased mechanical characteristics of the Rm with copper alloys AlSi25Cu4Cr and AlSi25Cu5Cr before being subjected to thermic processing. The volume of the used modifier in the presence of which a premodification of the structure of the testing alloys is present, which leads to the reduction of their impact strength, was experimentally defined. The influence of the final structure of the alloys on the roughness grade of the surfaces was studied during mechanical processing. It was determined that the alloys with the maximum modified effect have the highest amount of Ra after lathing.

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