Abstract
The dependence of L2 phase particle distribution in the matrix of monotectic alloys on such solidification parameters as temperature gradient, growth rate and cooling rate was examined. Al-10wt%Pb and Al-3.4 to 30wt%Bi alloys were solidified unidirectionally in an insulating mold placed on a copper chill and non-directionally in graphite, copper and water-cooled copper molds. The alloys containing a liquid miscibility gap solidify accompanying heavy gravity segregation. This segregation is caused by coarsening of L2 phase droplets and their migration during cooling in the miscibility gap. Casting monotectic alloys containing Pb up to 10wt% and Bi up to 20wt% in a copper mold ensures fine and homogeneous dispersion of L2 phase particles.
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