Abstract:This investigation adopts a strategic approach focusing on low-melting point eutectic alloy design supplemented by thermodynamic calculations of phase diagrams to develop and characterize Zrx(NiFe)100-x alloy systems (x=75/83/90 wt.%). Results demonstrate that at Zr concentrations of 83 wt.% and above, the alloys develop a distinctive lamellar eutectic microstructure (tI12-Zr2(Ni/Fe)/FCC-Zr) coexisting with HCP-Zr, featuring nanoscale FeZr3 interphase precipitates at eutectic interfaces. Notably, the liquidus formation temperature exhibits a substantial reduction to approximately 974℃, successfully achieving the desired low-melting point characteristics. The Zr83(NiFe)17 and Zr90(NiFe)10 alloys exhibit compressive strengths of 1352±12 MPa and 1253±10 MPa with corresponding fracture strains of 14.2±0.4% and 17±0.3%, respectively. These values represent a significant enhancement in fracture strain compared to conventional Zr-based amorphous alloys while maintaining comparable strength properties. Fractographic analysis reveals that dislocation pinning mechanisms and shear band bifurcation phenomena induced by eutectic interfaces effectively impede crack propagation, facilitating a transition in fracture mode from brittle cleavage to 45° shear-dominated failure with increasing Zr content. Under dynamic compression, both 83Zr and 90Zr alloys exhibit a strain rate hardening effect, and when the strain rate exceeds a critical value, the alloys undergo a ductile-to-brittle transition. This research establishes a fundamental framework for the design of low-melting point Zr-based eutectic multiphase alloys.