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Wang F, Ding C, Yang Z, Zhang H, Ding Z, Li H, Xu J, Shan D, Guo B. Microstructure Evolution and Mechanical Properties of AlCoCrFeNi 2.1 Eutectic High-Entropy Alloys Processed by High-Pressure Torsion. MATERIALS (BASEL, SWITZERLAND) 2024; 17:2954. [PMID: 38930322 PMCID: PMC11205409 DOI: 10.3390/ma17122954] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2024] [Revised: 06/12/2024] [Accepted: 06/13/2024] [Indexed: 06/28/2024]
Abstract
High-entropy alloys (HEAs) have garnered significant attention for their exceptional properties, with eutectic high-entropy alloys (EHEAs) emerging as particularly notable due to their incorporation of eutectic structures comprising soft and hard phases. This study investigated the influence of shear strain on the microstructural refinement and mechanical properties of AlCoCrFeNi2.1 EHEAs, which were subjected to high-pressure torsion (HPT) at room temperature under a pressure of 6 GPa across 0.5 to 3 turns, compared to the initial material. After HPT treatment, significant grain refinement occurred due to strong shear strain, evidenced by the absence of B2 phase peaks in X-ray diffraction (XRD) analysis. Microhardness increased substantially post-HPT, reaching a saturation point at approximately 575 HV after three turns, significantly higher than that of the original sample. Moreover, the ultimate tensile strength of HPT-treated specimens reached around 1900 MPa after three revolutions, compared to approximately 1100 MPa for the as-cast alloy, with a mixed fracture mode maintained. This investigation underscores the efficacy of HPT in enhancing the mechanical properties of AlCoCrFeNi2.1 EHEAs through microstructural refinement induced by shear deformation, offering insights into the design and optimization of advanced HEAs for various engineering applications.
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Affiliation(s)
- Fanghui Wang
- Key Laboratory of Micro-Systems and Micro-Structures Manufacturing of Ministry of Education, Harbin Institute of Technology, Harbin 150001, China
- National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China
- School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Chaogang Ding
- Key Laboratory of Micro-Systems and Micro-Structures Manufacturing of Ministry of Education, Harbin Institute of Technology, Harbin 150001, China
- National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China
- School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Zhiqin Yang
- National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China
- School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
- Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 37673, Republic of Korea
| | - Hao Zhang
- School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Ziheng Ding
- Key Laboratory of Micro-Systems and Micro-Structures Manufacturing of Ministry of Education, Harbin Institute of Technology, Harbin 150001, China
- National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China
- School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Hushan Li
- Key Laboratory of Micro-Systems and Micro-Structures Manufacturing of Ministry of Education, Harbin Institute of Technology, Harbin 150001, China
- National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China
- School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Jie Xu
- Key Laboratory of Micro-Systems and Micro-Structures Manufacturing of Ministry of Education, Harbin Institute of Technology, Harbin 150001, China
- National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China
- School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Debin Shan
- Key Laboratory of Micro-Systems and Micro-Structures Manufacturing of Ministry of Education, Harbin Institute of Technology, Harbin 150001, China
- National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China
- School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Bin Guo
- Key Laboratory of Micro-Systems and Micro-Structures Manufacturing of Ministry of Education, Harbin Institute of Technology, Harbin 150001, China
- National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China
- School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
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Tsau CH, Hsiao HP, Chien TY. Corrosion Behavior of CrFeCoNiV 0.5 and CrFeCoNiV Alloys in 0.5 M and 1 M Sodium Chloride Solutions. MATERIALS (BASEL, SWITZERLAND) 2023; 16:4900. [PMID: 37512175 PMCID: PMC10381418 DOI: 10.3390/ma16144900] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Revised: 06/30/2023] [Accepted: 07/04/2023] [Indexed: 07/30/2023]
Abstract
The effects of the concentration of NaCl solutions on the corrosion resistance of granular CoCrFeNiV0.5 and dendritic CrFeCoNiV high-entropy alloys were studied. The polarization behavior of CoCrFeNiV0.5 and CrFeCoNiV alloys in deaerated 0.5 M and 1 M sodium chloride solution at different temperatures was measured by a constant galvanostatic/potentiometric. Electrochemical impedance spectroscopy (EIS) was used to examine CoCrFeNiV0.5 CrFeCoNiV alloys in 0.5 M and 1 M NaCl solutions. The results indicated that the CoCrFeNiV0.5 alloy showed a better corrosion resistance than that of CrFeCoNiV alloy because the dendritic structure of CrFeCoNiV had too many σ/FCC interfaces. The critical pitting temperatures (CPTs) of the alloys under different applied potentials were also analyzed. All of the results proved that CrFeCoNiV0.5 alloy had better corrosion resistance in 0.5 M and 1 M NaCl solutions.
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Affiliation(s)
- Chun-Huei Tsau
- Institute of Nanomaterials, Chinese Culture University, Taipei 111, Taiwan
| | - Hui-Ping Hsiao
- Institute of Nanomaterials, Chinese Culture University, Taipei 111, Taiwan
| | - Tien-Yu Chien
- Institute of Nanomaterials, Chinese Culture University, Taipei 111, Taiwan
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Brito-Garcia S, Mirza-Rosca J, Geanta V, Voiculescu I. Mechanical and Corrosion Behavior of Zr-Doped High-Entropy Alloy from CoCrFeMoNi System. MATERIALS (BASEL, SWITZERLAND) 2023; 16:1832. [PMID: 36902947 PMCID: PMC10003814 DOI: 10.3390/ma16051832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 02/08/2023] [Accepted: 02/20/2023] [Indexed: 06/18/2023]
Abstract
The aim of the paper is to study the Zr addition effect on the mechanical properties and corrosion behavior of a high-entropy alloy from the CoCrFeMoNi system. This alloy was designed to be used for components in the geothermal industry that are exposed to high temperature and corrosion. Two alloys, one Zr-free (named Sample 1) and another one doped with 0.71 wt.% Zr (named Sample 2), were obtained in a vacuum arc remelting equipment from high-purity granular raw materials. Microstructural characterization and quantitative analysis by SEM and EDS were performed. The Young modulus values for the experimental alloys were calculated on the basis of a three-point bending test. Corrosion behavior was estimated by linear polarization test and by electrochemical impedance spectroscopy. The addition of Zr resulted in a decrease in the value of the Young modulus but also in a decrease in corrosion resistance. The beneficial effect of Zr on the microstructure was the grain refinement, and this ensured a good deoxidation of the alloy.
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Affiliation(s)
- Santiago Brito-Garcia
- Mechanical Engineering Department, Las Palmas de Gran Canaria University, 35017 Tafira, Spain
| | - Julia Mirza-Rosca
- Mechanical Engineering Department, Las Palmas de Gran Canaria University, 35017 Tafira, Spain
| | - Victor Geanta
- Faculty of Industrial Engineering and Robotics, Politehnica University of Bucharest, 313 Splaiul Independentei, 060042 Bucharest, Romania
| | - Ionelia Voiculescu
- Faculty of Industrial Engineering and Robotics, Politehnica University of Bucharest, 313 Splaiul Independentei, 060042 Bucharest, Romania
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