Homogenous solidification of undercooled Cu-37.4 wt%Pb monotectic melt

Abstract

The solidification behavior and solidification structure evolution of Cu-37.4wt%Pb undercooled melt under different undercoolings were studied by the combination of molten glass purification and cyclic superheating. With the increase in the undercooling, the solidification microstructure undergoes the coarse-fine-coarse-layered transition process and the distribution of Pb particles in the solidified structure is changed accordingly. With the distribution function of the second phase droplet under the combined action of nucleation, growth and deposition, the range for the critical undercooling of undercooled melt required for realizing the homogeneous solidification is obtained by solving and simplifying the function and then experimentally verified.