1. Optimizing corrosion resistance of equiatomic AlCoCrFeNi high entropy alloys via heat treatment.
- Author
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Gu, Xin-Hui, Huang, Qiu-Yu, Chen, Jia-Bo, Hu, Hui-Song, Sun, Qing-Qing, Wu, Lian-Kui, and Cao, Fa-He
- Subjects
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CORROSION resistance , *HEAT treatment , *FACE centered cubic structure , *SCANNING electron microscopes , *DIFFERENTIAL scanning calorimetry - Abstract
In order to modify the mechanical and magnetic characteristics of high-entropy alloys (HEAs), phase transformation has been extensively studied. However, the impact of phase transformation on corrosion resistance has received less attention. In this paper, the intensive investigation of BCC/B2 to FCC phase transformation of equiatomic AlCoCrFeNi reveals the correlation between corrosion resistance and microstructure transformation under different heat treatment temperatures. Combined with differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscope (SEM) and electron backscattered diffraction (EBSD), the phase transformation of equiatomic AlCoCrFeNi heat treated with increasing temperature is BCC + B2 (as-cast) → BCC + B2 (600 °C) → BCC + B2+ FCC +σ (850 °C) → BCC + B2+ FCC (1100 °C). Combined with the results of SKPFM, immersion tests, and electrochemical measurements, the alloy treated at 1100 °C has the most excellent corrosion resistance due to its unique phase composition with the highest FCC phase and no intermetallic. • The correlation between heat treatment temperature and corrosion resistance of equiatomic AlCoCrFeNi was studied. • The microstructure of AlCoCrFeNi is changed from BCC to σ + FCC + BCC (850 °C), and then to FCC + BCC (1100 °C). • With increasing temperature, the corrosion resistance of AlCoCrFeNi is gradually improved except for 600 °C. • AlCoCrFeNi treated at 1100 °C exhibits most excellent corrosion resistance due to maximum FCC phase without intermetallic. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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