Cinética de la transformación de fase \pmb{$\alpha +\eta \to \beta $}, por microscopía electrónica de transmisión, de una aleación eutectoide Zn-Al solidificada rápidamente

A. S, oval Jiménez. , J. Negrete Sánchez, G. Torres Villaseñor

Abstract


By using transmission electron microscopy (TEM) technique was established the phase transformations kinetic of a Zn-Al eutectoid alloy solidified rapidly. The phase transformations experiments were realized and filmed in situ, at heating and cooling, into a transmission electron microscope. The kinetic was established considering only the Johnson-Mehl mathematical model, $y = 1 - e^{ - kt^n}$, where $y$ is the fraction transformed, $k $is the rate constant reaction and $n$ is the reaction order; $y$ was determined by measuring area increase of the high temperature $\beta $ phase, with regard to time, at video images of phase transformations; $n$ and $k$ are functions of $y$ and $t$.

Keywords


Kinetics; transmission electron microscopy; phase transformations; zinc-aluminium alloy; rapid solidification

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REVISTA MEXICANA DE FÍSICA, year 67, issue 2, March-April 2021. Bimonthly Journal published by Sociedad Mexicana de Física, A. C. Departamento de Física, 2º Piso, Facultad de Ciencias, Universidad Nacional Autónoma de México, Ciudad Universitaria, Alcaldía Coyacán, C.P. 04510 , Ciudad de México. Apartado Postal 70-348. Tel. (+52)55-5622-4946, https://rmf.smf.mx/ojs/rmf, e-mail: rmf@ciencias.unam.mx. Chief Editor: José Alejandro Ayala Mercado. INDAUTOR Certificate of Reserve: 04-2019-080216404400-203, ISSN: 2683-2224 (on line), 0035-001X (print), both granted by Instituto Nacional del Derecho de Autor. Responsible for the last update of this issue, Technical Staff of Sociedad Mexicana de Física, A. C., Fís. Efraín Garrido Román, 2º. Piso, Facultad de Ciencias, Universidad Nacional Autónoma de México, Ciudad Universitaria, Alcaldía Coyacán, C.P. 04510 , Ciudad de México. Date of last modification, March 1st., 2021.

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