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  Dynamic deformation behavior of a face-centered cubic FeCoNiCrMn high-entropy alloy

He, J., Wang, Q., Zhang, H., Dai, L., Mukai, T., Wu, Y., et al. (2018). Dynamic deformation behavior of a face-centered cubic FeCoNiCrMn high-entropy alloy. Science Bulletin, 63(6), 362-368. doi:10.1016/j.scib.2018.01.022.

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He, Junyang1, 2, Author              
Wang, Qi3, 4, Author              
Zhang, Husheng4, Author              
Dai, Lanhong4, Author              
Mukai, Toshiji5, Author              
Wu, Yuan6, Author              
Liu, Xiongjun6, Author              
Wang, Hui6, Author              
Nieh, Tai-Gang7, Author              
Lu, Zhaoping6, Author              
1Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863384              
2State Key Laboratory for Advance Metals and Materials, University of Science and Technology Beijing, Beijing, China, ou_persistent22              
3China Ship Development and Design Center, Wuhan, China, ou_persistent22              
4State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China, ou_persistent22              
5Department of Mechanical Engineering, Kobe University, 1-1, Rokkodai, Nada, Kobe, Japan, ou_persistent22              
6State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China, ou_persistent22              
7Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN, USA, ou_persistent22              


Free keywords: Chromium alloys; Cobalt alloys; Deformation; Dynamics; Entropy; Grain boundaries; Grain size and shape; High resolution transmission electron microscopy; Iron alloys; Manganese alloys; Mechanical properties; Strain hardening; Tensile strength; Transmission electron microscopy, Deformation twinning; Dynamic deformation; Dynamic deformation behavior; Electron back scatter diffraction; High entropy alloys; Plastic stability; Tension and compression; Ultimate tensile strength, Strain rate
 Abstract: In this study, mechanical tests were conducted on a face-centered cubic FeCoNiCrMn high-entropy alloy, both in tension and compression, in a wide range of strain rates (10−4–104 s−1) to systematically investigate its dynamic response and underlying deformation mechanism. Materials with different grain sizes were tested to understand the effect of grain size, thus grain boundary volume, on the mechanical properties. Microstructures of various samples both before and after deformation were examined using electron backscatter diffraction and transmission electron microscopy. The dislocation structure as well as deformation-induced twins were analyzed and correlated with the measured mechanical properties. Plastic stability during tension of the current high-entropy alloy (HEA), in particular, at dynamic strain rates, was discussed in lights of strain-rate sensitivity and work hardening rate. It was found that, under dynamic conditions, the strength and uniform ductility increased simultaneously as a result of the massive formation of deformation twins. Specifically, an ultimate tensile strength of 734 MPa and uniform elongation of ∼63 are obtained at 2.3 × 103 s−1, indicating that the alloy has great potential for energy absorption upon impact loading. © 2018 Science China Press


Language(s): eng - English
 Dates: 2018-03-30
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.scib.2018.01.022
BibTex Citekey: He2018362
 Degree: -



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Title: Science Bulletin
  Abbreviation : Sci. Bull.
Source Genre: Journal
Publ. Info: Elsevier B.V.
Pages: - Volume / Issue: 63 (6) Sequence Number: - Start / End Page: 362 - 368 Identifier: ISSN: 2095-9273
CoNE: https://pure.mpg.de/cone/journals/resource/2095-9273