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, the Al-In immiscible alloy was prepared by the melt spinning process and its morphological evolution was 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 distributions 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. Al-7In, Al-12In, Al-17.5In and Al-30In are used in the experiment.