Formation and Properties of New La-Based Bulk Glassy Alloys with Diameters up to Centimeter Order

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 La 62:5 Cu 20 -Al 12:5 Ag 5 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 La 62:5 Al 12:5 Cu 10 Ni 5 Co 5 Ag 5 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%.

Thermal and mechanical properties of La–Al–Sb alloys

“…The Labased alloys exhibit high fracture strength of 640-858 MPa with distinct plastic strains of 0.2-0.4 % [20,21].…”

Enhancement of the glass forming ability of La–Al–Cu glassy alloys by partial substitution of Al by Mg

“…The other is the substitution of TM by another TM element. For instance, La 65 Al 13 Ni 10 Cu 12 [11], La 62.0 Al 15.7 (Cu,Ni) 22.3 [12], La 62 (Cu 0.5 Ni 0.5 ) 24 Al 14 [13] and La 62.5 Al 12.5 Cu 10 Ni 5 Co 5 Ag 5 [14] alloys could be cast into a full glassy rod with a diameter of 10, 11, 12, and 12 mm, respectively. Recently, Jiang et al [15] have prepared a La 65 Al 14 (Cu 5/6 Ag 1/6 ) 11 (Ni 1/2 Co 1/2 ) 10 BMG with diameter up to 30 mm by the water quenching method, and Zhang [16] reported the (La 0.5 Ce 0.5 ) 65 Al 10 (Co 0.6 Cu 0.4 ) 25 BMG of 32 mm in diameter in 2009.…”