Composition and phase structure dependence of mechanical and magnetic properties for AlCoCuFeNix high entropy alloys |
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| Affiliation: | 1. School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore;2. Singapore and Singapore-HUJ Alliance for Research and Enterprise (SHARE), Nanomaterials for Energy and Energy-Water Nexus (NEW), Campus for Research Excellence and Technological Enterprise (CREATE), Singapore 138602, Singapore;3. Department of Materials Science and Engineering, University of North Texas, Denton, TX 76201, USA;1. Applied Materials Physics, Department of Materials Science and Engineering, Royal Institute of Technology, Stockholm SE-100 44, Sweden;2. Department of Materials and Nano Physics, Royal Institute of Technology, Electrum 229, SE-16440 Kista, Sweden;3. Sandvik Coromant R&D, 126 80, Stockholm, Sweden;4. Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, H-1525 Budapest, P.O. Box 49, Hungary;5. Department of Physics and Astronomy, Division of Materials Theory, Uppsala University, Box 516, SE-75120 Uppsala, Sweden |
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| Abstract: | In this study, the effects of composition and phase constitution on the mechanical properties and magnetic performance of AlCoCuFeNix (x = 0.5, 0.8, 1.0, 1.5, 2.0, 3.0 in molar ratio) high entropy alloys (HEAs) were investigated. The results show that Ni element could lead to the evolution from face centered cubic (FCC), body centered cubic (BCC) and ordered BCC coexisting phase structure to a single FCC phase. The change of phase constitution enhances the plasticity but reduces the hardness and strength. One of the interesting points is the excellent soft magnetic properties of AlCoCuFeNix HEAs. Soft magnetic performance is dependent on composition and phase transition. AlCoCuFeNi1.5 alloy, achieving a better balance of mechanical and magnetic properties, could be applied as structure materials and soft magnetic materials (SMMs). High Curie temperature (>900 K) and strong phase stability below 1350 K of AlCoCuFeNi0.5 alloy confirm its practicability in a high-temperature environment. Atomic size difference (δ) is utilized as the critical parameter to explain the lattice strain and phase transformation induced by Ni addition. |
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| Keywords: | High entropy alloy Phase transformation Mechanical property Soft magnetic performance Atomic size difference |
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