Artículo
Exceptionally high spallation strength for a high-entropy alloy demonstrated by experiments and simulations
Thürmer, Daniel; Zhao, Shiteng; Deluigi, Orlando Raul
; Stan, Camelia; Alhafez, Iyad Alabd; Urbassek, Herbert M.; Meyers, Marc A.; Bringa, Eduardo Marcial
; Gunkelmann, Nina
Fecha de publicación:
25/02/2022
Editorial:
Elsevier Science SA
Revista:
Journal of Alloys and Compounds
ISSN:
0925-8388
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
High-entropy alloys are materials with an increasing number of technological applications. Amongst them, the Cantor alloy, FeMnCoCrNi, shows desirable mechanical properties at normal loading conditions. In this study we focus on the performance of the Cantor alloy at the ultra-high deformation rates of shock waves. We study shock-induced spallation using both experiments and atomistic simulations. Experimental loading is achieved using high power laser, with VISAR to obtain velocity profiles and spall strength, followed by transmission electron microscopy of the recovered samples. Molecular Dynamics (MD) simulations of shock-induced spallation are compared with experiments. Both experiments and simulations show a high spall strength which would be beneficial for certain applications, with experiments giving ~8 GPa at ~107s−1 and MD giving almost ~30 GPa at ~109s−1. The difference between experiments and simulations can be explained by the difference in strain rate. Post-mortem analysis of the experimental samples shows nanotwins near the spall plane, while MD simulations show a highly disordered region giving rise to void nucleation and spall during loading.
Palabras clave:
HIGH-ENTROPY ALLOYS
,
MOLECULAR DYNAMICS
,
SHOCK WAVES
,
SPALLATION
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Identificadores
Colecciones
Articulos(CCT - MENDOZA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - MENDOZA
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - MENDOZA
Citación
Thürmer, Daniel; Zhao, Shiteng; Deluigi, Orlando Raul; Stan, Camelia; Alhafez, Iyad Alabd; et al.; Exceptionally high spallation strength for a high-entropy alloy demonstrated by experiments and simulations; Elsevier Science SA; Journal of Alloys and Compounds; 895; 25-2-2022; 1-8
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