Enhancement of La addition on glass forming ability and thermal stability of Al₈₅Ni₇Er_8 − xLa_x (x = 0–4) glassy alloys

We optimized the alloy compositions by adding La content in the Al₈₅Ni₇Er_8 − xLa_x (x = 0, 1, 2, 3, 4) alloys to improve the glass forming ability (GFA) and thermal stability. When increasing the La content x from 0 to 4, the glass transition temperature, T_g, and the crystallization temperature, T_x, of melt-spun Al₈₅Ni₇Er_8 − xLa_x (x = 0–4) alloys increased from 531 and 555.4 K to 550.5 and 577.1 K, respectively. The Al₈₅Ni₇Er_8 − xLa_x (x = 0–4) alloys exhibited high reduced glass transition temperature T_rg (= T_g / T_l, with T_l is the liquidus temperature) (> 0.44), and a wide supercooled liquid region, ΔT_x (= T_x − T_g) (> 24.3 K). Meanwhile, Al₈₅Ni₇Er_8 − xLa_x (x = 0–4) alloys exhibited high crystallization activation energies (384.5–439.8 kJ/mol), exhibiting excellent thermal stability.