Comportamiento del flujo de esfuerzo y análisis microestructural de compuestos de matriz de aluminio deformados en caliente y reforzados con partículas de la aleación con memoria de forma CuZnAlNi

Kenneth K. Alaneme; Michael O. Bodunrin; Lesley H. Chown; Nthabiseng B. Maledi

doi:10.3989/revmetalm.170

Autores/as

Kenneth K. Alaneme Materials Design and Structural Integrity Research Group, Department of Metallurgical and Materials Engineering, Federal University of Technology - Department of Metallurgical and Materials Engineering, Federal University of Technology https://orcid.org/0000-0002-1582-4702
Michael O. Bodunrin Materials Design and Structural Integrity Research Group, Department of Metallurgical and Materials Engineering, Federal University of Technology - Department of Metallurgical and Materials Engineering, Federal University of Technology - School of Chemical and Metallurgical Engineering, University of the Witwatersrand https://orcid.org/0000-0001-6736-4771
Lesley H. Chown School of Chemical and Metallurgical Engineering, University of the Witwatersrand - DST-NRF Centre of Excellence in Strong Materials, University of the Witwatersrand https://orcid.org/0000-0001-9699-6065
Nthabiseng B. Maledi School of Chemical and Metallurgical Engineering, University of the Witwatersrand https://orcid.org/0000-0003-2862-2218

DOI:

https://doi.org/10.3989/revmetalm.170

Palabras clave:

Aleación base Al reforzada con composites, Aleación CuZnAlNi, Flujo de esfuerzo, Deformación en caliente, Memoria de forma, Mecanismo de refuerzo

Resumen

Se investigó el comportamiento del flujo de esfuerzo por compresión y las microestructuras de los compuestos de matriz de aleación de Al deformada en caliente (AMC) y reforzados con partículas de la aleación con memoria de forma (SMA) basadas en CuZnAlNi. La aleación base Al-Mg-Si reforzada con 4, 6 y 8% en peso de Cu-18Zn-7Al-0,3Ni, y 8% en peso de partículas de SiC, se obtuvieron mediante agitación doble y se sometieron a pruebas de compresión en caliente a una velocidad de deformación de 1,0 s⁻¹, temperatura de 400 °C, y ~60% de deformación global constante, para ello se utilizó un simulador termo-mecánico Gleeble 3500. Las microestructuras iniciales y deformadas de los compuestos se examinaron utilizando microscopía óptica. El uso de partículas Cu-18Zn-7Al-0,3Ni como refuerzo dio como resultado el desarrollo de una estructura de matriz más fina en comparación con el SiC. La tensión de flujo y la dureza de los AMC reforzados con partículas de Cu-18Zn-7Al-0,3Ni fueron generalmente más altos que los de la aleación de Al no reforzada y la aleación de Al reforzada con SiC. También la tensión de flujo y, en gran medida, la dureza creció con el aumento en el porcentaje en peso de partículas de Cu-18Zn-7Al-0,3Ni en el AMC. La mejora observada con el uso de partículas de la aleación Cu-18Zn-7Al-0,3Ni se atribuyó a la combinación del refuerzo mejorado y el refinamiento del tamaño grano de la matriz, fortalecimiento la interface, el esfuerzo residual de compresión, la alta conductividad térmica, y la capacidad de amortiguación ofrecida por la aleación Cu-18Zn-7Al-0,3Ni.

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