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Thermal stability of amorphous Mg50Ni50 alloy produced by mechanical alloying |
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| Authors: | D. Guzmá n,S. Ordoñ ez,P.A. Rojas,M. Santander |
| Affiliation: | a Departamento de Ingeniería en Metalurgia, Facultad de Ingeniería, Universidad de Atacama y Centro Regional de Investigación y Desarrollo Sustentable de Atacama, Av. Copayapu 485, Copiapó, Chile b Departamento de Ingeniería Metalúrgica, Facultad de Ingeniería, Universidad de Santiago de Chile, Av. Lib. Bernardo O’Higgins 3363, Santiago, Chile c Departamento de Física, Facultad de Ciencias, Universidad de Santiago de Chile and Center for Interdisciplinary Research in Materials, CIMAT, Av. Lib. Bernardo O’Higgins 3363, Santiago, Chile d Escuela de Ingeniería Mecánica, Facultad de Ingeniería, Av. Los Carrera 01567, Quilpué, Pontificia Universidad Católica de Valparaíso, PUCV, Chile e Instituto de Materiales y Procesos Termomecánicos, Facultad de Ciencias de la Ingeniería, Universidad Austral de Chile, Av. General Lagos 2086, Valdivia, Chile |
| Abstract: | Amorphous Mg50Ni50 alloy was produced by mechanical alloying (MA) of the elemental powders Mg and Ni using a SPEX 8000D mill. The alloyed powders were microstructurally characterized by X-ray diffraction (XRD). The thermal transformation of amorphous Mg50Ni50 into stable intermetallics (Mg50Ni50 → remaining amorphous + Mg2Ni → Mg2Ni + MgNi2) was analyzed using the Kissinger and isoconversional methods based on the non-isothermal differential scanning calorimetry (DSC) experiments. The apparent activation energies (Ea) and the transformation diagrams, temperature-time-transformation (T-T-T) and temperature-heating rate-transformation (T-HR-T), were obtained for both processes. A good agreement was observed between the calculated transformation curves and the experimental data, which verifies the reliability of the method utilized. |
| Keywords: | Amorphous metals, metallic glasses Alloys Mechanical alloying X-ray diffraction Powders Thermal properties |
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