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

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, and lowermore »« less

Authors:

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)

Publication Date:: 2018-11-22

Research Org.:: Argonne National Lab. (ANL), Argonne, IL (United States)

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

OSTI Identifier:: 1524604

Alternate Identifier(s):: OSTI ID: 1642304

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

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:: 36 MATERIALS SCIENCE; 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.

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                    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:https://doi.org/10.1016/j.ijplas.2018.11.011

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                    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:https://doi.org/10.1016/j.ijplas.2018.11.011.  https://www.osti.gov/servlets/purl/1524604.

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@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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DOI: https://doi.org/10.1016/j.ijplas.2018.11.011

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Works referencing / citing this record:

Computational characterization of the structural and mechanical properties of Al x CoCrFeNiTi 1− x high entropy alloys
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Computational characterization of the structural and mechanical properties of Al x CoCrFeNiTi 1− x high entropy alloys
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Novel Multicomponent Powders from the AlCrFeMnMo Family Synthesized by Mechanical Alloying
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Advanced Engineering Materials, Vol. 21, Issue 12
DOI: 10.1002/adem.201900808

Study on the damping behaviour of eutectic high-entropy alloys with lamellar structures
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Lin, Li-Feng; Tsai, Che-Wei
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DOI: 10.1080/09500839.2019.1660819

Effects of pulsed laser surface treatments on microstructural characteristics and hardness of CrCoNi medium-entropy alloy
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Chai, Linjiang; Xiang, Kang; Xia, Jiying
Philosophical Magazine, Vol. 99, Issue 24
DOI: 10.1080/14786435.2019.1649499

Strain-rate sensitivity of high-entropy alloys and its significance in deformation
journal, September 2019

Moon, Jongun; Hong, Sun Ig; Seol, Jae Bok
Materials Research Letters, Vol. 7, Issue 12
DOI: 10.1080/21663831.2019.1668489

Additive Manufacturing of High-Entropy Alloys: A Review
journal, December 2018

Chen, Shuying; Tong, Yang; Liaw, Peter
Entropy, Vol. 20, Issue 12
DOI: 10.3390/e20120937

Effects of Al Addition on Microstructures and Mechanical Properties of CoCrFeMnNiAlx High Entropy Alloy Films
journal, December 2019

Hsu, Ya-Chu; Li, Chia-Lin; Hsueh, Chun-Hway
Entropy, Vol. 22, Issue 1
DOI: 10.3390/e22010002

Scaling in the Local Strain-Rate Field during Jerky Flow in an Al-3%Mg Alloy
journal, January 2020

Lebyodkin, Mikhail; Bougherira, Youcef; Lebedkina, Tatiana
Metals, Vol. 10, Issue 1
DOI: 10.3390/met10010134

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

Abstract

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