Phase separation and microstructural characteristics of undercooled Cu-Pb immiscible alloy

摘要

Bulk samples of Cu-80/100 Pb hypermonotectic alloy were undercooled by up to 270 K (0.21T_L) with glass fluxing technique. The undercooling behavior and the final microstructure were investigated experimentally. It was found that the macrosegregation decreased with the increase of undercooling exponentially. When undercooling reached 70 K, the volume fraction of macrosegregation was reduced by one order of magnitude. Meanwhile, high undercooling brought about significant changes to the microstructural morphology of S(Cu) phase.