Microstructure of Cu75Cr25 alloys under different conditions

摘要

The microstructure of Cu75Cr25 alloys was investigated by using vacuum non-consumable arc melting,electromagnetic levitation and splat quenching.The microstructure and solidification behavior of the Cr-rich were investigated by scanning electron microscopy (SEM).The results showed that inhomogeneous Cr-rich dendrite distributes on Cu-rich matrix for arc melted alloys.The microstructure consisting of a fine dispersion of Cr-rich dendrite in a Cu-rich matrix for electromagnetic levitated alloys.However,the morphology and size of the Cr-rich phase vary greatly with the cooling rate for splat quenched alloys.The Cr-rich phase show both dendrites and spheroids,this means liquid phase separation occurred during rapid solidification.