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

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 66-77 K. The best GFA was obtained for Pd₇₅Si₁₅Ag₃Cu₇ alloy, and the glassy rods with diameters of up to 10 mm were fabricated by copper mold casting method without fluxing treatment. These BMGs also exhibit low viscosity of ∼2 × 10⁷ Pa s in the supercooled liquid state, excellent thermoplastic formability, high compressive yield strength of ∼1626 MPa, and large plastic strain of ∼0.063.