Experiments and Model for Serration Statistics in Low-Entropy, Medium-Entropy, and High-Entropy Alloys
Abstract
In this study, 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.
- Authors:
-
- Univ. of Illinois, Urbana-Champaign, IL (United States). Dept. of Physics
- National Tsing Hua Univ., Hsinchu (Taiwan). Dept. of Materials Science and Engineering
- Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
- Publication Date:
- Research Org.:
- Univ. of Tennessee, Knoxville, TN (United States)
- Sponsoring Org.:
- USDOE Office of Fossil Energy (FE)
- OSTI Identifier:
- 1227105
- Alternate Identifier(s):
- OSTI ID: 1241026
- Grant/Contract Number:
- FE0011194; FE0008855
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Scientific Reports
- Additional Journal Information:
- Journal Volume: 5; Journal ID: ISSN 2045-2322
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Portevin-LeChatellier (PLC) effect; serration mechanism; low-entropy alloy; medium-entropy alloy; high-entropy alloy; mechanical properties; metals and alloys; scaling laws; statistical physics
Citation Formats
Carroll, Robert, Lee, Chi, Tsai, Che-Wei, Yeh, Jien-Wei, Antonaglia, James, Brinkman, Braden A.W., LeBlanc, Michael, Xie, Xie, Chen, Shuying, Liaw, Peter K, and Dahmen, Karin A. Experiments and Model for Serration Statistics in Low-Entropy, Medium-Entropy, and High-Entropy Alloys. United States: N. p., 2015.
Web. doi:10.1038/srep16997.
Carroll, Robert, Lee, Chi, Tsai, Che-Wei, Yeh, Jien-Wei, Antonaglia, James, Brinkman, Braden A.W., LeBlanc, Michael, Xie, Xie, Chen, Shuying, Liaw, Peter K, & Dahmen, Karin A. Experiments and Model for Serration Statistics in Low-Entropy, Medium-Entropy, and High-Entropy Alloys. United States. https://doi.org/10.1038/srep16997
Carroll, Robert, Lee, Chi, Tsai, Che-Wei, Yeh, Jien-Wei, Antonaglia, James, Brinkman, Braden A.W., LeBlanc, Michael, Xie, Xie, Chen, Shuying, Liaw, Peter K, and Dahmen, Karin A. Mon .
"Experiments and Model for Serration Statistics in Low-Entropy, Medium-Entropy, and High-Entropy Alloys". United States. https://doi.org/10.1038/srep16997. https://www.osti.gov/servlets/purl/1227105.
@article{osti_1227105,
title = {Experiments and Model for Serration Statistics in Low-Entropy, Medium-Entropy, and High-Entropy Alloys},
author = {Carroll, Robert and Lee, Chi and Tsai, Che-Wei and Yeh, Jien-Wei and Antonaglia, James and Brinkman, Braden A.W. and LeBlanc, Michael and Xie, Xie and Chen, Shuying and Liaw, Peter K and Dahmen, Karin A},
abstractNote = {In this study, 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.},
doi = {10.1038/srep16997},
journal = {Scientific Reports},
number = ,
volume = 5,
place = {United States},
year = {Mon Nov 23 00:00:00 EST 2015},
month = {Mon Nov 23 00:00:00 EST 2015}
}
Web of Science
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