Microstructure and mechanical properties of equimolar FeCoCrNi high entropy alloy prepared via powder extrusion |
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Affiliation: | 1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi''an 710072, China;2. Center of Advanced Structural Materials, Department of Mechanical and Biomedical Engineering, College of Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong, China;1. Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak ro, Yuseong-gu, Daejeon 34141, Republic of Korea;2. Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak ro, Yuseong-gu, Daejeon 34141, Republic of Korea |
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Abstract: | An equiatomic FeCoCrNi high alloy (HEA) with both high tensile strength and ductility was produced by a powder metallurgy (P/M) method. The P/M process includes a gas atomization and a hot extrusion of pre-alloyed HEA powder. Microstructures and mechanical properties were characterized using optical microscopy (OP), scanning electron microscopy (SEM), electron backscattered diffraction (EBSD), and tensile tests. The results show that the P/M FeCoCrNi HEA has a single face centered cubic (fcc) structure and an equiaxed microstructure. No obvious porosity and brittle intermetallic phase was found. The as-extruded alloy exhibits a very high tensile strength of 712.5 MPa, and still maintains an elongation as high as 56%. The improvement of the tensile properties is caused by the solid solution strengthening, grain boundary strengthening and homogenous microstructure. Therefore, the powder hot extrusion can be considered as a promising way for preparing large-sized HEAs with high mechanical properties. |
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Keywords: | High entropy alloys Powder metallurgy Extrusion Microstructures Mechanical properties Electron backscatter diffraction |
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