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

Brechtl, J.; Chen, S. Y.; Xie, X.; Ren, Y.; Qiao, J. W.; Liaw, P. K.; Zinkle, S. J.

doi:10.1016/j.ijplas.2018.11.011

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

Journal Article · 22 November 2018 · International Journal of Plasticity

DOI: https://doi.org/10.1016/j.ijplas.2018.11.011 · OSTI ID:1524604

Brechtl, J. ^[1]; Chen, S. Y. ^[1]; Xie, X. ^[1]; Ren, Y. ^[2]; Qiao, J. W. ^[3]; Liaw, P. K. ^[1];

^[1]

Univ. of Tennessee, Knoxville, TN (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Taiyuan Univ. of Technology (China)

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, 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.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; National Science Foundation (NSF); USDOE Office of Fossil Energy (FE); USDOE

Grant/Contract Number:: AC02-06CH11357; FE0008855; FE-0024054; FE-0011194; W911NF-13-1-0438

OSTI ID:: 1524604

Alternate ID(s):: OSTI ID: 1642304

Journal Information:: International Journal of Plasticity, Vol. 115, Issue C; ISSN 0749-6419

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Dynamic strain aging of Al 0.3 CoCrFeNi high entropy alloy single crystals Yasuda, Hiroyuki Y.; Shigeno, Kyosuke; Nagase, Takeshi Scripta Materialia, Vol. 108 https://doi.org/10.1016/j.scriptamat.2015.06.022	journal	November 2015
Nanostructured High-Entropy Alloys with Multiple Principal Elements: Novel Alloy Design Concepts and Outcomes Yeh, J.-W.; Chen, S.-K.; Lin, S.-J. Advanced Engineering Materials, Vol. 6, Issue 5, p. 299-303 https://doi.org/10.1002/adem.200300567	journal	May 2004
A Portevin-Le Chatelier effect expected from solute atmosphere dragging Yoshinaga, H.; Morozumi, S. The Philosophical Magazine: A Journal of Theoretical Experimental and Applied Physics, Vol. 23, Issue 186 https://doi.org/10.1080/14786437108217007	journal	June 1971
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