@article{2f8dcca5e4e8417991ead432bd778580,
title = "Experiments and Model for Serration Statistics in Low-Entropy, Medium-Entropy, and High-Entropy Alloys",
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.",
author = "Robert Carroll and Chi Lee and Tsai, {Che Wei} and Yeh, {Jien Wei} and James Antonaglia and Brinkman, {Braden A.W.} and Michael Leblanc and Xie Xie and Shuying Chen and Liaw, {Peter K.} and Dahmen, {Karin A.}",
note = "Funding Information: We thank Jonathan Uhl for ideas, suggestions, and important contributions to the present work, and John Weber, Greg Schwarz, and Abid Khan for helpful conversations. KAD thanks the Kavli Institute for Theoretical Physics (KITP) for kind hospitality and support during the finalization of this paper. We gratefully acknowledge the support of the US National Science Foundation (NSF) through grants of DMR 100520, DMS 1069224, PHY 11-25915 (KAD), DMR-0909037, CMMI-0900271, and CMMI-1100080, the Department of Energy (DOE), NEUP 00119262, DE-FE-0008855, and DE-FE-0024054 (PKL) with Drs. Hess, Curry, Huber, Cooper, Finotello, Ardell, Taleff, Cedro, Jensen, Dunst, Tan, and Lesica as contract monitors. KAD and PKL thank DOE for the support through project, DE-FE-0011194, with the project managers, Drs. Markovich and Mullen. PKL appreciates the support of the U.S. Army Research Office project (W911NF-13-1-0438) with the program manager, Drs. Mathaudhu and Stepp. The authors thank Yunzhu Shi, and Peiyong Chen for their kind help on the manuscript.",
year = "2015",
month = nov,
day = "23",
doi = "10.1038/srep16997",
language = "English (US)",
volume = "5",
journal = "Scientific Reports",
issn = "2045-2322",
publisher = "Nature Publishing Group",
}