Thermal stability and mechanical properties of Mg-Y-Cu-M (M = Ag, Pd) bulk amorphous alloys

Magnesium-based bulk amorphous alloys with a diameter of 7 mm for Mg65Y10Cu15Ag5Pd5 were produced by a metallic mold casting method. The glass transition temperature (T-g), crystallization temperature (T-x), the temperature interval of the supercooled liquid region (DeltaT(x) = T-x - T-g) and the melting temperature (T-m) are measured to be 437, 472, 35 and 707 K, respectively, for the Mg65Y10Cu15Ag5Pd5 alloy. The simultaneous addition of Ag and Pd to Mg-Y-Cu system causes a steep decrease in T-m and an increase in the reduced glass transition temperature (T-g/T-m), leading to an increase in the glass-forming ability. The Mg-Y-Cu-(Ag, Pd) hulk amorphous alloys have a high compressive fracture strength of 770 MPa. The simultaneous addition of Ag and Pd is useful for the improvements or glass-forming ability and fracture strength.