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Trasformación microestructural in situ y su correlación con la resistividad eléctrica en la aleación de aluminio AA-6061 Translated title: Microstructural transformation in situ and its correlation with the electrical resistivity in aluminiun alloy A-6061

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      Abstract

      En el presente trabajo se realizó el estudio comparativo entre la variación de la resistividad eléctrica en función de la temperatura dinámica con las transformaciones de fase observadas mediante experimentos de envejecimientos “in situ” en el microscopio electrónico de transmisión, en aluminio AA-6061. Las imágenes obtenidas permiten apreciar el crecimiento de los precipitados. Para envejecimientos isotérmicos entre 200 y 350°C se aprecia la formación de las fases β´´, β´, y a temperaturas más altas la ulterior transformación a la fase β, para posteriormente la redisolución de fases a temperaturas superiores a 450°C. Particularmente las fases metaestables β´´ y β´ alcanzan sus máximos tamaños entre, aproximadamente, 220 y 350°C. En otro tipo de experimento se midió la resistividad eléctrica, observándose que las variaciones experimentadas por ésta están directamente asociadas con las transformaciones de fase, y son fuertemente influenciadas por la presencia de las fases β´´ y β´.

      Translated abstract

      In the present work, a comparative study between the variation of electrical resistivity as a function of the dynamic temperature and the phase transformations observed in the aluminium AA-6061 alloy was carried out, during “in situ” TEM aging. By this method, it was possible observe the growth of precipitates. For isothermal aging between 200 y 350°C the formation of the phases β´´ and β´ was observed. At higher temperatures, the subsequent transformation to β phase, and the redissolution of phases at temperatures above 450°C was also observed. Particularly, the metastable phases β´´ and β´ reached their maximum size between 220 and 350°C. In another type of experiment, the electrical resistivity measured up, being observed that the variations shown by this parameter were directly associated with the phase transformations, and they were also strongly influenced by the presence of the phases β´´ and β´.

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      Most cited references 38

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      Processing of nanocrystalline ceramics from ultrafine particles

       M. J. Mayo (2013)
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        The theory of transformations in metals and alloys

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            Author and article information

            Affiliations
            [1 ] Instituto Venezolano de Investigaciones Científicas, IVIC Venezuela
            Contributors
            Role: ND
            Role: ND
            Role: ND
            Journal
            rlmm
            Revista Latinoamericana de Metalurgia y Materiales
            Rev. LatinAm. Metal. Mater.
            Universidad Simón Bolívar (Caracas )
            0255-6952
            December 2012
            : 32
            : 2
            : 185-194
            S0255-69522012000200004

            http://creativecommons.org/licenses/by/4.0/

            Product
            Product Information: SciELO Venezuela
            Categories
            MATERIALS SCIENCE, MULTIDISCIPLINARY
            METALLURGY & METALLURGICAL ENGINEERING

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