Plastic dynamics of the Al0.5CoCrCuFeNi high entropy alloy at cryogenic temperatures: Jerky flow, stair-like fluctuation, scaling behavior, and non-chaotic state

Xiaoxiang Guo, Xie Xie, Jingli Ren, Marina Laktionova, Elena Tabachnikova, Liping Yu, Wing Sum Cheung, Karin A. Dahmen, Peter K. Liaw

Research output: Contribution to journalArticlepeer-review

Abstract

This study investigates the plastic behavior of the Al0.5CoCrCuFeNi high-entropy alloy at cryogenic temperatures. The samples are uniaxially compressed at 4.2 K, 7.5 K, and 9 K. A jerky evolution of stress and stair-like fluctuation of strain are observed during plastic deformation. A scaling relationship is detected between the released elastic energy and strain-jump sizes. Furthermore, the dynamical evolution of serrations is characterized by the largest Lyapunov exponent. The largest Lyapunov exponents of the serrations at the three temperatures are all negative, which indicates that the dynamical regime is non-chaotic. This trend reflects an ordered slip process, and this ordered slip process exhibits a more disordered slip process, as the temperature decreases from 9 K to 4.2 K or 7.5 K.

Original languageEnglish (US)
Article number251905
JournalApplied Physics Letters
Volume111
Issue number25
DOIs
StatePublished - Dec 18 2017

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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