Abstract
New La-based bulk glassy alloys with superior glass-forming ability (GFA) were synthesized in La-Al-Ag-(Cu,Co,Ni) system. The addition of 5 at%Ag to La-Al-Cu ternary base system greatly increases the stability of supercooled liquid as well as the GFA. The largest supercooled liquid region and largest diameter in La-Al-Cu-Ag quaternary system were of 83 K and 6.0 mm, respectively, for La62.5Cu20Al12.5Ag5 alloy. The addition of Ni or Co to La-Al-Cu-Ag alloy is effective for the further increase in GFA. The maximum sample diameter of over 12 mm was fabricated for La62.5Al12.5Cu10Ni5Co5Ag5 alloy. The GFA has better correlation with reduced glass transition temperature. The new La-based bulk glassy alloys exhibit high fracture strength of 640–858 MPa with distinct plastic strains of 0.2–0.4%.
