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

Abstract

This study reports on 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 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.

Authors:
 [1];  [2]; ORCiD logo [3];  [4];  [4];  [1];  [5];  [6];  [2]
  1. Zhengzhou Univ. (China)
  2. Univ. of Tennessee, Knoxville, TN (United States)
  3. Zhengzhou Univ. (China); Chinese Academy of Sciences (CAS), Beijing (China)
  4. National Academy of Sciences of Ukraine (NASU), Kharkov (Ukraine). B. Verkin Inst. for Low Temperature Physics and Engineering
  5. Univ. of Hong Kong (China)
  6. Univ. of Illinois, Urbana-Champaign, IL (United States)
Publication Date:
Research Org.:
Univ. of Tennessee, Knoxville, TN (United States); Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1527165
Grant/Contract Number:  
FE0008855; FE0024054; FE0011194
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 111; Journal Issue: 25; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Guo, Xiaoxiang, Xie, Xie, Ren, Jingli, Laktionova, Marina, Tabachnikova, Elena, Yu, Liping, Cheung, Wing-Sum, Dahmen, Karin A., and Liaw, Peter K. Plastic dynamics of the Al0.5CoCrCuFeNi high entropy alloy at cryogenic temperatures: Jerky flow, stair-like fluctuation, scaling behavior, and non-chaotic state. United States: N. p., 2017. Web. doi:10.1063/1.5004241.
Guo, Xiaoxiang, Xie, Xie, Ren, Jingli, Laktionova, Marina, Tabachnikova, Elena, Yu, Liping, Cheung, Wing-Sum, Dahmen, Karin A., & Liaw, Peter K. Plastic dynamics of the Al0.5CoCrCuFeNi high entropy alloy at cryogenic temperatures: Jerky flow, stair-like fluctuation, scaling behavior, and non-chaotic state. United States. doi:10.1063/1.5004241.
Guo, Xiaoxiang, Xie, Xie, Ren, Jingli, Laktionova, Marina, Tabachnikova, Elena, Yu, Liping, Cheung, Wing-Sum, Dahmen, Karin A., and Liaw, Peter K. Tue . "Plastic dynamics of the Al0.5CoCrCuFeNi high entropy alloy at cryogenic temperatures: Jerky flow, stair-like fluctuation, scaling behavior, and non-chaotic state". United States. doi:10.1063/1.5004241. https://www.osti.gov/servlets/purl/1527165.
@article{osti_1527165,
title = {Plastic dynamics of the Al0.5CoCrCuFeNi high entropy alloy at cryogenic temperatures: Jerky flow, stair-like fluctuation, scaling behavior, and non-chaotic state},
author = {Guo, Xiaoxiang and Xie, Xie and Ren, Jingli and Laktionova, Marina and Tabachnikova, Elena and Yu, Liping and Cheung, Wing-Sum and Dahmen, Karin A. and Liaw, Peter K.},
abstractNote = {This study reports on 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 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.},
doi = {10.1063/1.5004241},
journal = {Applied Physics Letters},
number = 25,
volume = 111,
place = {United States},
year = {2017},
month = {12}
}

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Cited by: 5 works
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Figures / Tables:

FIG. 1 FIG. 1: Strain-time, stress-time, and stress-strain curves at 4.2K, 7.5K, and 9K.

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.