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Carroll R, Lee C, Tsai CW, et al. Experiments and Model for Serration Statistics in Low-Entropy, Medium-Entropy, and High-Entropy Alloys. Sci Rep. 2015;5:16997doi: 10.1038/srep16997.
Carroll, R., Lee, C., Tsai, C. W., Yeh, J. W., Antonaglia, J., Brinkman, B. A., LeBlanc, M., Xie, X., Chen, S., Liaw, P. K., & Dahmen, K. A. (2015). Experiments and Model for Serration Statistics in Low-Entropy, Medium-Entropy, and High-Entropy Alloys. Scientific reports, 516997. https://doi.org/10.1038/srep16997
Carroll, Robert, et al. "Experiments and Model for Serration Statistics in Low-Entropy, Medium-Entropy, and High-Entropy Alloys." Scientific reports vol. 5 (2015): 16997. doi: https://doi.org/10.1038/srep16997
Carroll R, Lee C, Tsai CW, Yeh JW, Antonaglia J, Brinkman BA, LeBlanc M, Xie X, Chen S, Liaw PK, Dahmen KA. Experiments and Model for Serration Statistics in Low-Entropy, Medium-Entropy, and High-Entropy Alloys. Sci Rep. 2015 Nov 23;5:16997. doi: 10.1038/srep16997. PMID: 26593056; PMCID: PMC4655315.
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Sci Rep. 2015 Nov 23;5:16997. doi: 10.1038/srep16997.

Experiments and Model for Serration Statistics in Low-Entropy, Medium-Entropy, and High-Entropy Alloys.

Scientific reports

Robert Carroll, Chi Lee, Che-Wei Tsai, Jien-Wei Yeh, James Antonaglia, Braden A W Brinkman, Michael LeBlanc, Xie Xie, Shuying Chen, Peter K Liaw, Karin A Dahmen

Affiliations

  1. University of Illinois at Urbana-Champaign, Department of Physics, 1110 West Green Street, Urbana, IL 61801, USA.
  2. National Tsing Hua University, Department of Materials Science and Engineering, Hsinchu, 30013, Taiwan.
  3. The University of Tennessee-Knoxville, Department of Materials Science and Engineering, Knoxville, TN 37996, USA.

PMID: 26593056 PMCID: PMC4655315 DOI: 10.1038/srep16997

Abstract

High-entropy alloys (HEAs) are new alloys that contain five or more elements in roughly-equal proportion. We present new experiments and theory on the deformation behavior of HEAs under slow stretching (straining), and observe differences, compared to conventional alloys with fewer elements. For a specific range of temperatures and strain-rates, HEAs deform in a jerky way, with sudden slips that make it difficult to precisely control the deformation. An analytic model explains these slips as avalanches of slipping weak spots and predicts the observed slip statistics, stress-strain curves, and their dependence on temperature, strain-rate, and material composition. The ratio of the weak spots' healing rate to the strain-rate is the main tuning parameter, reminiscent of the Portevin-LeChatellier effect and time-temperature superposition in polymers. Our model predictions agree with the experimental results. The proposed widely-applicable deformation mechanism is useful for deformation control and alloy design.

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