Effects of Al Addition on Microstructure and Electrochemical Property of FeCoCrNiMn High-Entropy Alloy in Different Treatment States

YU Rui; LI Ziyong; FU Liming; YIN Liqiang; LI Jin; SHAN Aidang

doi:10.11973/jxgccl201902001

Materials and Mechanical Engineering > 2019 > 43(2): 1-6. > DOI: 10.11973/jxgccl201902001

YU Rui, LI Ziyong, FU Liming, YIN Liqiang, LI Jin, SHAN Aidang. Effects of Al Addition on Microstructure and Electrochemical Property of FeCoCrNiMn High-Entropy Alloy in Different Treatment States[J]. Materials and Mechanical Engineering, 2019, 43(2): 1-6. DOI: 10.11973/jxgccl201902001

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Effects of Al Addition on Microstructure and Electrochemical Property of FeCoCrNiMn High-Entropy Alloy in Different Treatment States

1. School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China;
2. School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China;
3. Department of Materials Science, Fudan University, Shanghai 200243, China

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Received Date: November 05, 2017
Revised Date: December 11, 2018

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Abstract

Abstract

FeCoCrNiMn and Al_0.3FeCoCrNiMn high-entropy alloys were prepared by vacuum melting technique, and then subjected to homogenization treatment at 1 150℃ for 6 h (solid solution state) and severe rolling at room temperature followed by annealing at 800℃ for 1 h (rolled and annealed state). The microstructure and the electrochemical property in 0.5 mol·L^-1 H₂SO₄ solution at room temperature of the alloys in solid solution state and in rolled and annealed state were studied. The results show that the two high-entropy alloys in solid solution state were both composed of single face-centered cubic phase. After severe rolling and annealing treatment, FeCoCrNiMn high-entropy alloy was still composed of single face-centered cubic phase, and the grains were refined to 4.57 μm; with the addition of Al, a large amount of σ phase (Cr-rich) and body-centerd cubic phase (Cr-depleted) precipitated in the alloy, and the grains were refined to lower than 500 nm. In the H₂SO₄ solution, the two high-entropy alloys in different treatment states possessed a passive region, and the addition of Al decreased corrosion resistance of the FeCoCrNiMn alloy.
- FeCoCrNiMn high-entropy alloy,
- aluminum,
- grain refinement,
- microstructure,
- electrochemical property

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