Abstract
Many materials are known to deform under shear in an intermittent way with slip avalanches detected as acoustic emission and serrations in the stress–strain curves. Similar serrations have recently been observed in a new class of materials, called high-entropy alloys (HEAs). Here, we discuss the serration behaviors of several HEAs from cryogenic to elevated temperatures. The experimental results of slow compression and tension tests are compared with the predictions of a slip-avalanche model for the deformation of a broad range of solids. The results shed light on the deformation processes in HEAs. Temperature effects on the distributions of stress drops and the decrease of the cutoff (i.e., of the largest observed slip size) for increasing temperature qualitatively agree with the model predictions. The model is used to quantify the serration characteristics of HEAs, and pertinent implications are discussed.
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Acknowledgements
X.X., Z.T., and P.K.L. appreciate the financial support from the U.S. National Science Foundation (DMR-0909037, CMMI-0900271, and CMMI-1100080), the Department of Energy (DOE), Office of Nuclear Energy’s Nuclear Energy University Program (NEUP) 00119262, and the DOE, Office of Fossil Energy, National Energy Technology Laboratory (DE-FE-0008855) with C. Huber, C.V. Cooper, D. Finotello, A. Ardell, E. Taleff, V. Cedro, R.O. Jensen, L. Tan, and S. Lesica as contract monitors. K.A.D. and J.A. gratefully acknowledge the NSF Grants DMR-1005209 and DMS-1069224 with D. Hess and J. Curry as contract monitors. K.A.D., X.X., and P.K.L. thank DOE for the support through project FE0011194 with the project manager S. Markovich. Y.Z. appreciates the financial support from the National Natural Science Foundation of China (Nos. 51010001 and 51001009), 111 Project (B07003), and the Program for Changjiang Scholars and the Innovative Research Team of the University. M.C.G. and P.K.L. very much appreciate the support from the U.S. Army Research Office project (W911NF-13-1-0438) with the program manager S.N. Mathaudhu. Work of ONS was supported through the Air Force on-site contract FA8650-10-D-5226 conducted by UES, Inc., Dayton, Ohio. All authors are grateful to the suggestions and comments of Dr. D.B. Miracle.
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Antonaglia, J., Xie, X., Tang, Z. et al. Temperature Effects on Deformation and Serration Behavior of High-Entropy Alloys (HEAs). JOM 66, 2002–2008 (2014). https://doi.org/10.1007/s11837-014-1130-9
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DOI: https://doi.org/10.1007/s11837-014-1130-9