Glass-Forming Ability and Properties of New Au-Based Glassy Alloys with Low Au Concentrations

Abstract

Au₄₀Si_17-20Cu_28-30Ag_5-7Pd₅ glassy alloys showed a wide supercooled liquid region of 42–53 K and a large reduced glass transition temperature of 0.568–0.605, indicating high stabilization of supercooled liquid and high glass-forming ability (GFA). The best GFA was obtained from Au₄₀Si₂₀Cu₂₈Ag₇Pd₅ alloy, and a fully glassy sample with a diameter of 6 mm could be fabricated by copper mold casting. The bulk glassy alloys exhibited very low T_g of 400–424 K, high fracture strength of over 1100 MPa, and corrosion resistance superior to SUS316L in 1 N H₂SO₄ solution.