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

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

doi:10.1063/1.5004241

Title: Plastic dynamics of the Al_0.5CoCrCuFeNi high entropy alloy at cryogenic temperatures: Jerky flow, stair-like fluctuation, scaling behavior, and non-chaotic state

Journal Article · Tue Dec 19 00:00:00 EST 2017 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.5004241· OSTI ID:1527165

Guo, Xiaoxiang ^[1]; Xie, Xie ^[2];

^[3]; Laktionova, Marina ^[4]; Tabachnikova, Elena ^[4]; Yu, Liping ^[1]; Cheung, Wing-Sum ^[5]; Dahmen, Karin A. ^[6]; Liaw, Peter K. ^[2]

Zhengzhou Univ. (China)
Univ. of Tennessee, Knoxville, TN (United States)
Zhengzhou Univ. (China); Chinese Academy of Sciences (CAS), Beijing (China)
National Academy of Sciences of Ukraine (NASU), Kharkov (Ukraine). B. Verkin Inst. for Low Temperature Physics and Engineering
Univ. of Hong Kong (China)
Univ. of Illinois, Urbana-Champaign, IL (United States)

This study reports on the plastic behavior of the Al_0.5CoCrCuFeNi 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 implies 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.

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Research Organization:: Univ. of Tennessee, Knoxville, TN (United States); Univ. of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: FE0008855; FE0024054; FE0011194

OSTI ID:: 1527165

Journal Information:: Applied Physics Letters, Vol. 111, Issue 25; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 21 works

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