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Title: Towards a greater understanding of serrated flows in an Al-containing high-entropy-based alloy

Abstract

A serrated flow, which occurs in a material undergoing mechanical deformation, is a complex process of great engineering significance. Here statistical, dynamical, and multifractal modeling and analyses were performed on the stress-time series to characterize and model the stress-drop behavior of an Al 0.5CoCrCuFeNi high-entropy alloy (HEA). Results indicate that the spatiotemporal dynamics of the serrated flow is affected by changes in the strain rate and test temperature. The sample entropy, in general, was found to be the highest in the samples tested at 500°C. The higher complexity in the serrated flow at this temperature appeared to be associated with the stress-drop behavior that had intermediate values in terms of the maximum stress drop, the multifractality of the data set, and the histogram distributions. Moreover, the sample entropy was the lowest for the samples tested at 600 °C. The lower complexity values were associated with a wider multifractal spectrum and a less uniform and sparser distribution of the stress-drop magnitudes. In terms of the serration types, Type-C serrations were related to the lowest complexity values, widest multifractal spectra, and higher probability of exhibiting larger stress drops. Conversely, Type-A and B serrations were associated with the higher complexity, narrower spectra, andmore » lower probability of higher stress drops. In conclusion, the body-centered-cubic (BCC) structure and the fully-ordered L1 2 nano-particles were found to emerge in the samples at 600°C and are thought to be linked to the decreased spatiotemporal correlations in the stressdrop behavior.« less

Authors:
 [1];  [1];  [1];  [2];  [3];  [1]; ORCiD logo [1]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Taiyuan Univ. of Technology (China)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division; National Science Foundation (NSF); USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1524604
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
International Journal of Plasticity
Additional Journal Information:
Journal Volume: 115; Journal Issue: C; Journal ID: ISSN 0749-6419
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
Dislocations; High entropy alloys; Mechanical testing; Numerical algorithms; Serrated flow

Citation Formats

Brechtl, J., Chen, S. Y., Xie, X., Ren, Y., Qiao, J. W., Liaw, P. K., and Zinkle, S. J. Towards a greater understanding of serrated flows in an Al-containing high-entropy-based alloy. United States: N. p., 2018. Web. doi:10.1016/j.ijplas.2018.11.011.
Brechtl, J., Chen, S. Y., Xie, X., Ren, Y., Qiao, J. W., Liaw, P. K., & Zinkle, S. J. Towards a greater understanding of serrated flows in an Al-containing high-entropy-based alloy. United States. doi:10.1016/j.ijplas.2018.11.011.
Brechtl, J., Chen, S. Y., Xie, X., Ren, Y., Qiao, J. W., Liaw, P. K., and Zinkle, S. J. Thu . "Towards a greater understanding of serrated flows in an Al-containing high-entropy-based alloy". United States. doi:10.1016/j.ijplas.2018.11.011. https://www.osti.gov/servlets/purl/1524604.
@article{osti_1524604,
title = {Towards a greater understanding of serrated flows in an Al-containing high-entropy-based alloy},
author = {Brechtl, J. and Chen, S. Y. and Xie, X. and Ren, Y. and Qiao, J. W. and Liaw, P. K. and Zinkle, S. J.},
abstractNote = {A serrated flow, which occurs in a material undergoing mechanical deformation, is a complex process of great engineering significance. Here statistical, dynamical, and multifractal modeling and analyses were performed on the stress-time series to characterize and model the stress-drop behavior of an Al0.5CoCrCuFeNi high-entropy alloy (HEA). Results indicate that the spatiotemporal dynamics of the serrated flow is affected by changes in the strain rate and test temperature. The sample entropy, in general, was found to be the highest in the samples tested at 500°C. The higher complexity in the serrated flow at this temperature appeared to be associated with the stress-drop behavior that had intermediate values in terms of the maximum stress drop, the multifractality of the data set, and the histogram distributions. Moreover, the sample entropy was the lowest for the samples tested at 600 °C. The lower complexity values were associated with a wider multifractal spectrum and a less uniform and sparser distribution of the stress-drop magnitudes. In terms of the serration types, Type-C serrations were related to the lowest complexity values, widest multifractal spectra, and higher probability of exhibiting larger stress drops. Conversely, Type-A and B serrations were associated with the higher complexity, narrower spectra, and lower probability of higher stress drops. In conclusion, the body-centered-cubic (BCC) structure and the fully-ordered L12 nano-particles were found to emerge in the samples at 600°C and are thought to be linked to the decreased spatiotemporal correlations in the stressdrop behavior.},
doi = {10.1016/j.ijplas.2018.11.011},
journal = {International Journal of Plasticity},
number = C,
volume = 115,
place = {United States},
year = {2018},
month = {11}
}

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