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

Autor: He J; State Key Laboratory for Advance Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China; Max-Planck-Institut für Eisenforschung, Max-Planck-Straße 1, D-40237 Düsseldorf, Germany., Wang Q; State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China; China Ship Development and Design Center, Wuhan 430064, China., Zhang H; State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China., Dai L; State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China., Mukai T; Department of Mechanical Engineering, Kobe University, 1-1, Rokkodai, Nada, Kobe 657-8501, Japan., Wu Y; State Key Laboratory for Advance Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China., Liu X; State Key Laboratory for Advance Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China., Wang H; State Key Laboratory for Advance Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China., Nieh TG; Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996, USA., Lu Z; State Key Laboratory for Advance Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China. Electronic address: luzp@ustb.edu.cn.
Jazyk: angličtina
Zdroj: Science bulletin [Sci Bull (Beijing)] 2018 Mar 30; Vol. 63 (6), pp. 362-368. Date of Electronic Publication: 2018 Jan 31.
DOI: 10.1016/j.scib.2018.01.022
Abstrakt: 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 -10 4  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 × 10 3  s -1 , indicating that the alloy has great potential for energy absorption upon impact loading.
(Copyright © 2018 Science China Press. Published by Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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