Alloy Design and Solidification Microstructure Analysis in Fe–P–C–Ag Immiscible Metallic Glass

Solidification microstructure in Fe-based Fe–X-based metallic glasses (X = Cu, Ag, Au, Pd, Pt, Rh, Ir, Ru, Os, Re, Hg) (X is a noble metallic element) with liquid phase separation (LPS) was categorized. Only Fe–Cu-based and Fe–Ag-based metallic glasses with liquid phase separation were reported among Fe–X-based alloys. Fe–P–C–Ag immiscible metallic glasses which showed liquid-phase separation were designed using the alloy parameters of mixing enthalpy, the ground state diagrams constructed by the Materials Project, and Calculation of Phase Diagrams (CALPHAD). Macroscopically separated ribbons composed of FCC-Ag entangled ribbons and Fe–P–C metallic glass ribbons were obtained by a melt-spinning method. The formation mechanism of the macroscopically separated ribbons in Fe–P–C–Ag immiscible metallic glasses is described with LPS behavior and melt-spinning process in this study.