Diseño y caracterización de tres aleaciones multiprincipales ligeras potencialmente candidatas a aleaciones de alta entropía

Pablo Pérez; Gerardo Garcés; Enrique Frutos-Myro; Juan M. Antoranz; Sophia Tsipas; Paloma Adeva

doi:10.3989/revmetalm.147

Autores/as

Pablo Pérez Centro Nacional de Investigaciones Metalúrgicas (CENIM, CSIC) https://orcid.org/0000-0002-4218-2573
Gerardo Garcés Centro Nacional de Investigaciones Metalúrgicas (CENIM, CSIC) https://orcid.org/0000-0002-6896-7475
Enrique Frutos-Myro Centro Nacional de Investigaciones Metalúrgicas (CENIM, CSIC) https://orcid.org/0000-0002-3146-2350
Juan M. Antoranz Universidad Politécnica de Madrid (UPM – ETSIAE) https://orcid.org/0000-0002-7982-0188
Sophia Tsipas Universidad Carlos III de Madrid https://orcid.org/0000-0001-7590-2795
Paloma Adeva Centro Nacional de Investigaciones Metalúrgicas (CENIM, CSIC) https://orcid.org/0000-0002-9111-8893

DOI:

https://doi.org/10.3989/revmetalm.147

Palabras clave:

Alta entropía, Microanálisis, Microestructura, Microscopía, Tenacidad

Resumen

En este trabajo se estudia la posibilidad de preparar aleaciones de alta entropía del sistema Al-Sc-Ti-V-Cr. Para ello se han seleccionado los elementos y la composición utilizando los criterios conocidos y disponibles en la literatura y se han preparado mediante fusión por arco tres aleaciones con contenidos que varían entre el 10 y 35 at.%. Las tres aleaciones tienen una microestructura dendrítica bifásica similar, siendo las dendritas una solución sólida bcc enriquecida en Ti, V o Cr. El escandio aparece únicamente en el espacio interdendrítico formando el intermetálico Al₂Sc. La dureza de las dendritas crece con el contenido en Ti y se hace menor a medida que es mayor el contenido en Cr. Además, la tenacidad de las aleaciones depende de la dureza de las dendritas siendo ésta mayor cuanto más blandas son las dendritas. Los resultados obtenidos demuestran que ni los criterios empíricos utilizados ni los cálculos mediante THERMOCALC permiten predecir la formación de una única solución sólida ni la naturaleza de las fases observadas experimentalmente.

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