Formation and properties of P-free Pd-based metallic glasses with high glass-forming ability

Abstract

New P-free Pd-based bulk metallic glasses (BMGs) with high glass-forming ability (GFA) were synthesized in Pd–Si–Ag–Cu alloy system, based on a binary Pd83Si17 alloy. Combined addition of Ag and Cu greatly enhances the stability of supercooled liquid and GFA. The Pd-based BMGs have large supercooled liquid region of 66–77K. The best GFA was obtained for Pd75Si15Ag3Cu7 alloy, and the glassy rods with diameters of up to 10mm were fabricated by copper mold casting method without fluxing treatment. These BMGs also exhibit low viscosity of ∼2×107Pas in the supercooled liquid state, excellent thermoplastic formability, high compressive yield strength of ∼1626MPa, and large plastic strain of ∼0.063.