Sm-based Sm-Al-Ni ternary bulk metallic glasses

摘要

The Sm-based Sm-Al-Ni glass-forming system was investigated using our e/a-and cluster-related criteria. Three bulk metallic glasses (BMGs) Sm_(54)Al_(23)Ni_(23), Sm_(56)Al_(22)Ni_(22), and Sm_(58)Al_(21)Ni_(21) were obtained by suction casting into rods with a diameter of 3 mm. All of them shared a constant e/a = 1.5 and fell along the e/a-constant composition line in the ternary composition chart. The Sm_(54)Al_(23)Ni_(23) BMG exhibiting the largest T_(rg) was located at the intersection point of the e/a-constant line and the Sm_7Ni_3-Al cluster line, with thermodynamic parameters of T_g = 548 K at a heating rate of 20 K/min, T_g/T_m = 0.634, and T_g/T_1 = 0.615. The Sm_7Ni_3 cluster was a capped trigonal prism derived from the SmNi phase.