Mesoscopic-scale complexity in macroscopically-uniform plastic flow of an Al0.3CoCrFeNi high-entropy alloy. (1st January 2023)

• Record Type: Journal Article
• Authors: Brechtl, Jamieson; Feng, Rui; Liaw, Peter K.; Beausir, Benoît; Jaber, Hafsa; Lebedkina, Tatiana; Lebyodkin, Mikhail
• Is Part Of: Acta materialia. Volume 242(2023)
• Publication Date: 2023-01-01
• Subjects: High-entropy alloys -- Scale transitions -- Digital image correlation -- Acoustic emission -- Statistical analysis; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2022.118445
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: 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 Al0.3 CoCrFeNi 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. Graphical abstract: Image, graphical abstract