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

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

doi:10.1038/srep16997

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

Journal Article · Mon Nov 23 00:00:00 EST 2015 · Scientific Reports

DOI:https://doi.org/10.1038/srep16997· OSTI ID:1227105

Carroll, Robert ^[1]; Lee, Chi ^[2]; Tsai, Che-Wei ^[2]; Yeh, Jien-Wei ^[2]; Antonaglia, James ^[1]; Brinkman, Braden A.W. ^[1]; LeBlanc, Michael ^[1]; Xie, Xie ^[3]; Chen, Shuying ^[3]; Liaw, Peter K ^[3]; Dahmen, Karin A ^[1]

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

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.

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Research Organization:: Univ. of Tennessee, Knoxville, TN (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: FE0011194; FE0008855

OSTI ID:: 1227105

Alternate ID(s):: OSTI ID: 1241026

Journal Information:: Scientific Reports, Vol. 5; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 90 works

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Design, Microstructure and Mechanical Properties of Cast Medium Entropy Aluminium Alloys Sanchez, Jon Mikel; Vicario, Iban; Albizuri, Joseba Scientific Reports, Vol. 9, Issue 1 https://doi.org/10.1038/s41598-019-43329-w	journal	May 2019
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Peculiarities of deformation of CoCrFeMnNi at cryogenic temperatures Tirunilai, Aditya Srinivasan; Sas, Jan; Weiss, Klaus-Peter Journal of Materials Research, Vol. 33, Issue 19 https://doi.org/10.1557/jmr.2018.252	journal	July 2018
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Title: Experiments and Model for Serration Statistics in Low-Entropy, Medium-Entropy, and High-Entropy Alloys

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