Affordable FeCrNiMnCu high entropy alloys with excellent comprehensive tensile properties |
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| Affiliation: | 1. Shanxi Key Laboratory of Material Strength & Structural Impact, Institute of Applied Mechanics and Biomedical Engineering, Taiyuan University of Technology, Taiyuan 030024, China;2. Laboratory of Applied Physics and Mechanics of Advanced Materials, College of Materials Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China;3. Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, China;4. State key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;1. School of Materials Engineering, Purdue University, West Lafayette, IN 47907, United States;2. Nuclear Science and Technology Department, Brookhaven National Laboratory, Upton, NY 11973-5000, United States;3. Beijing Advanced Innovation Center for Material Genome Engineering, State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | Fe0.4Cr0.4NiMnxCu (0 ≤ x ≤ 1.4) high entropy alloys (HEAs) were prepared by copper-mold casting. The phase selection, microstructure, tensile properties and fracture morphologies were investigated. The microstructure with dual FCC phases was formed in the as-cast HEAs with x ≤ 1, and BCC phase was crystallized from the central FCC dendrites of HEAs with x = 1.2 and 1.4. In homogenized Fe0.4Cr0.4NiMnCu HEA, needle-like shaped BCC phase was formed resulting in a slight enhancement of yield strength. Compositional heterogeneity was detected in both FCC and BCC dendrites. These HEAs exhibit excellent comprehensive tensile properties, e.g. the yield strength, ultimate strength and elongation of the HEA with x = 1 reaches 439 MPa, 884 MPa and 23.4%, respectively. High density of dislocations in FCC matrix was formed after tensile deformation. FCC type of fine polyhedra, which is mainly composed of Cr, Mn and O, is formed in dendrites. In this work, the phase selection and strengthening mechanism were evaluated based on atomic size factor. It was found that two criteria can be employed to predict the phase regions of current alloys. The solid solution strengthening for this HEA system is the most important among the four kinds of strengthening mechanisms. |
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| Keywords: | High entropy alloys Mechanical properties Microstructure Solid solution strengthening |
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