IMPROVING THE STRENGTH AND CORROSION PROPERTIES OF ALUMINIUM ALLOYS WHEN MODIFICATION WITH NANODISPERSED COMPOSITIONS

Abstract

Aluminium alloys of the Al-Si and Al-Mg-Sc systems, which are promising for nuclear power generating facilities, were studied. The AK9 aluminium casting alloy and the 1545 wrought alloy were selected as the study materials. Modification of aluminium alloys with a multicomponent nanodispersed modifier based on Mg2Si and SiC was proposed. Grain grinding of modifying alloys by 1.5–2 times, strength properties increasing by 12…18% and corrosion resistance improving were achieved. The mechanism of action of the multicomponent nanodispersed modifier in an aluminium melt was proposed. The use of such modifiers facilitates the technological process, is environmentally safe, and leads to a uniform distribution of the introduced nanocompositions, which increases the strength and stability of alloys. The results achieved showed the effectiveness of modification aluminium alloys with nanodispersed compositions.