Temperature Effects on Deformation and Serration Behavior of High-Entropy Alloys (HEAs) |
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| Authors: | J. Antonaglia X. Xie Z. Tang C.-W. Tsai J. W. Qiao Y. Zhang M. O. Laktionova E. D. Tabachnikova J. W. Yeh O. N. Senkov M. C. Gao J. T. Uhl P. K. Liaw K. A. Dahmen |
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| Affiliation: | 1.Department of Physics,University of Illinois at Urbana Champaign,Urbana,USA;2.Department of Materials Science and Engineering,The University of Tennessee,Knoxville,USA;3.Department of Materials Science and Engineering,National Tsing Hua University,Hsinchu,Taiwan;4.College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan,People’s Republic of China;5.State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing,People’s Republic of China;6.B.I. Verkin Institute for Low Temperature Physics and Engineering of National Academy of Sciences of Ukraine,Kharkiv,Ukraine;7.Air Force Research Laboratory, Materials and Manufacturing Directorate,Wright-Patterson Air Force Base,USA;8.National Energy Technology Laboratory,Albany,USA;9.USR Corporation,Albany,USA;10.Retired,USA |
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| 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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