Al-based metallic glass composites containing fcc Pb-rich crystalline spheres

Liquid immiscible systems present a unique opportunity in designing composites with sphere-dispersed microstructure. The authors report here phase formation of a multicomponent $Al82.87Pb2.5Ni4.88Y7.8Co1.95$ alloy upon melt spinning. The alloy undergoes liquid-liquid phase transformation in the liquid immiscibility gap and subsequently solidifies into Pb-rich crystalline phase and Al-rich amorphous phase. The Pb-rich phase with sphere shape is dispersed in the Al-based metallic glass matrix. The average diameter of the Pb-rich spheres is $∼0.62μm$ near the free side and $∼0.03μm$ near the wheel side of the ribbon.