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Effects of Temperature on Serrated Flows of Al0.5CoCrCuFeNi High-Entropy Alloy

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Abstract

Compression behavior of the Al0.5CoCrCuFeNi high-entropy alloy (HEA) was studied at different temperatures from 673 K to 873 K at a low strain rate of 5 × 10−5/s to investigate the temperature effect on the mechanical properties and serration behavior. The face-centered-cubic (fcc) structure is confirmed at the lower temperature of 673 K and 773 K, and a structure of mixed fcc and body-centered cubic (bcc) is identified at a higher temperature of 873 K after compression tests using high-energy synchrotron x-ray diffraction. By comparing the stress–strain curves at different temperatures, two opposite directions of serrations types were found, named upward serrations appearing at 673 K and 773 K and downward serrations at 873 K, which may be due to dynamic strain aging.

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Acknowledgements

The National Science Foundation (DMR-0909037, CMMI-0900291 and CMMI-1100080), the Department of Energy Office of Nuclear Energy’s Nuclear Energy University Programs (NEUP, Grant 00119262), and the DOE Office of Fossil Energy, NETL (DE-FE0008855, DE-FE-0024054, and DE-FE-0011194), with Drs. C.V. Cooper, A. Ardell, Z.M. Taleff, R.O. Jenseng Jr., L. Tian, V. Cedro, R. Dumt, S. Lesica, S. Markovich, and J. Mullen as program managers, provided additional funding, particularly for K.A.D. at University of Illinois at Urbana Champaign and S.C., X.X., and P.K.L. at The University of Tennessee. X.X. and P.K.L. very much appreciates the support from the U.S. Army Office Project (W911NF-13-1-0438) with the program managers, Drs. S.N. Mathaudhu and D.M. Stepp. J.W.Q. would like to acknowledge the financial support of the Youth Natural Science Foundation of Shanxi Province, China (No. 2015021005). The current research used resources of the Advanced Photon Source, a U.S. Department of Energy Office of Science User Facility operated for the DOE Office of Science by the Argonne National Laboratory under Contract No. DE-AC02-06CH11357. Y.Z. appreciates the financial support of the National High Technology Research and Development Program of China (No. 2009AA03Z113) and the National Science Foundation of China (Nos. 51471025 and 51210105006), 111 Project (B07003), and the Program for Changjiang Scholars and the Innovative Research Team of the University.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN, 37996, USA

    Shuying Chen, Xie Xie, Bilin Chen & Peter K. Liaw

  2. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, China

    Junwei Qiao

  3. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China

    Yong Zhang

  4. X-ray Science Division, Argonne National Laboratory, Argonne, IL, 60439, USA

    Yang Ren

  5. Department of Physics, University of Illinois at Urbana Champaign, Champaign, IL, USA

    Karin A. Dahmen

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  1. Shuying Chen
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Correspondence to Peter K. Liaw.

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Chen, S., Xie, X., Chen, B. et al. Effects of Temperature on Serrated Flows of Al0.5CoCrCuFeNi High-Entropy Alloy. JOM 67, 2314–2320 (2015). https://doi.org/10.1007/s11837-015-1580-8

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