Crystallization Kinetics of Hypo, Hyper and Eutectic Ni-Nb Glassy Alloys
Por:
Mendoza L.E., Hernández J.M., González J.G., Orgaz, Emilio, Lozada, Octavio, Figueroa I.A.
Publicada:
1 may 2022
Resumen:
This study presents the thermal and kinetic behavior of Ni58.5Nb41.5,
Ni59.5Nb40.5, and Ni60.5Nb39.5 binary glassy alloys. The alloys ingots
were obtained through an electric arc furnace and the ribbons using the
melt-spinning technique at two different wheel speeds, 8 and 25 m/s. The
non-isothermal study was carried out by means of Differential Scanning
Calorimetry (DSC) at five different heating rates: 12.5, 15, 17.5, 20,
and 22.5 K/min. X-ray Diffraction (XRD) analysis showed a fully glassy
phase for all ribbons for all compositions. For both wheel speeds, the
ribbons with higher Nb content were significantly thinner than those
with less content. The activation energies were calculated from the
Kissinger method, showing the tendency E-p1>E-x1>E-g, where E-p1,E- E-x
and E-g denote the activation energies of first peak temperature, the
first crystallization onset and glass transition, respectively. The
Flynn-Wall-Ozawa model displayed a close correlation with heating rates,
ribbon thicknesses, and composition. The Nb content enhanced the glassy
stability since the activation energy required for crystallization
increased at higher Nb concentrations.
Filiaciones:
Mendoza L.E.:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México (UNAM), Circuito Exterior S/N, Cd. Universitaria, Ciudad de México, 04510, Mexico
Hernández J.M.:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México (UNAM), Circuito Exterior S/N, Cd. Universitaria, Ciudad de México, 04510, Mexico
González J.G.:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México (UNAM), Circuito Exterior S/N, Cd. Universitaria, Ciudad de México, 04510, Mexico
Orgaz, Emilio:
Departamento de Física y Química Teórica, Facultad de Química, Universidad Nacional Autónoma de México (UNAM), Circuito Exterior s/n, Cd. Universitaria, Ciudad de México, 04510, Mexico
Lozada, Octavio:
Facultad de Ingeniería, Universidad Panamericana, Augusto Rodin 498, Ciudad de México, 03920, Mexico
Figueroa I.A.:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México (UNAM), Circuito Exterior S/N, Cd. Universitaria, Ciudad de México, 04510, Mexico
gold, Green Published, Gold, Green
|