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Serration behavior and negative strain rate sensitivity of Al0.1CoCrFeNi high entropy alloy
Affiliation:1. Department Materials Physics, Montanuniversitat Leoben, Jahnstraße 12, 8700, Leoben, Austria;2. Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, 8700, Leoben, Austria;3. Department of Manufacturing and Civil Engineering, Norwegian University of Science and Technology, Teknologivegen 22, Gjøvik, Norway;4. Department of Mechanical and Industrial Engineering, Tallinn University of Technology, Ehitajate Tee 5, 19086, Tallinn, Estonia;5. Department of Chemistry, Koç University, Rumelifeneri Yolu, Sarıyer, Turkey;6. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510640, China;7. School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, China;1. Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1, Yamada-oka, Suita, Osaka 565-0871, Japan;2. Research Center for Ultra-High Voltage Electron Microscopy, Osaka University, 7-1, Mihogaoka, Ibaraki, Osaka 567-0047, Japan;1. Department of Materials Science and Engineering, the University of Tennessee, Knoxville, TN 37996, USA;2. State Key Laboratory of Nuclear Physics and Technology, Center for Applied Physics and Technology, Peking University, Beijing 100871, People''s Republic of China;3. Materials Science & Technology Division, Oak Ridge National Laboratory, TN 37831-6138, USA;4. Department of Physics, University of Illinois at Urbana Champaign, 1110 West Green Street, Urbana, IL 61801, USA;1. AMMPI, University of North Texas, Denton, TX 76207, United States;2. Materials Science and Engineering, University of North Texas, Denton, TX 76207, United States;1. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China;2. Department of Materials Science and Engineering, The University of Tennessee, Knoxville 37996-2200, TN, USA
Abstract:Temperature dependent deformation mechanism of Al0.1CoCrFeNi high entropy alloy (HEA) was studied using monotonic and strain rate jump tests at various test temperatures in a coarse-grained single phase FCC HEA. The tensile properties of Al0.1CoCrFeNi HEA exhibited a modest temperature dependence in the tested range of 300–673 K. At an initial strain rate of 10−5 s−1, the serration type was a function of the test temperature. Furthermore, the strain rate sensitivity of the flow stress changed from positive to zero to negative once the unstable plastic deformation region due to dynamic strain aging was attained.
Keywords:High-entropy alloy  Mechanical properties  Work-hardening  Strain-aging  Dislocations
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