Formation mechanism of microstructure of melt spun Al-In immiscible alloys

Immiscible alloys are attractive for their valuable physical and mechanical properties. In this paper, Al-In immiscible alloy is prepared by melt spinning process and its morphological evolution is studied at various indium contents. The results show that the morphologies of the matrix phase depend on the indium content. Different morphologies lead to different distribution of the second phase particles. Due to a particular solidification mechanism of immiscible alloys, even under the melt spinning rapid solidification condition, it is still impossible to produce homogeneous Al-In hypomonotectic alloy ribbons. But for Al-In hypermonotectic alloys, there is almost no segregation of the second phase throughout the cross section of the ribbons.