Mesoscopic-Scale Complexity in Macroscopically-Uniform Plastic Flow of an Al0.3CoCrFeNi High-Entropy Alloy - LEM3 - Laboratoire d'étude des Microstructures et de Mécanique des Matériaux Accéder directement au contenu
Article Dans Une Revue Acta Materialia Année : 2023

Mesoscopic-Scale Complexity in Macroscopically-Uniform Plastic Flow of an Al0.3CoCrFeNi High-Entropy Alloy

Résumé

The concept of a smooth and homogeneous plastic flow of solids is nowadays constantly challenged by various observations of the self-organization of crystal defects on mesoscopic scales pertaining, e.g., to acoustic emission or the evolution of the local strain field. Such investigations would be of particular interest for High-Entropy Alloys (HEAs) characterized by extremely complex microstructures. However, the complexity of their deformation has been only studied in relation to the jerky flow. The present work explores a mesoscale complexity of the macroscopically-smooth plastic flow of an Al0.3CoCrFeNi alloy. An inclusive approach involving various experimental methods and complementary nonlinear analyses allowed to reveal transitions between distinct dynamical regimes, which may be assimilated with noises of different colors, in particular the blue noise that is rarely observed in complex systems, and various kinds of reddened behavior. Such findings provide significant new insights into the micro/macro transition in the deformation behavior of HEAs.
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Dates et versions

hal-03818085 , version 1 (04-11-2022)

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Paternité - Pas d'utilisation commerciale - Pas de modification

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Citer

Jamieson Brechtl, Rui Feng, Peter K Liaw, Benoît Beausir, Hafsa Jaber, et al.. Mesoscopic-Scale Complexity in Macroscopically-Uniform Plastic Flow of an Al0.3CoCrFeNi High-Entropy Alloy. Acta Materialia, 2023, 242, pp.118445. ⟨10.1016/j.actamat.2022.118445⟩. ⟨hal-03818085⟩
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