Vliyanie RZE na protsess kristallizatsii silumina zaevtekticheskogo tipa

Abstract

The theories and mechanisms explaining the processes of primary silicon modification in hypereutectic silumins are considered. The processes of crystallization of hypereutectic silumin treated with rare-earth elements (REE): yttrium, ytterbium, samarium, erbium, lanthanum and neodymium have been studied. The temperatures of phase transformations and parameters taking into account the solid phase separation in the crystallization interval have been obtained. Differences in crystallization parameters and the nature of solid phase evolution in alloys modified with yttrium, ytterbium, samarium, erbium, cerium and neodymium are shown. It is concluded that further research is necessary to clarify the mechanism of modification of primary silicon in REE hypereutectic alloys.