Thermal stability and corrosion behavior of a novel Zr22.5Ti22.5Hf22.5Ni22.5Ta10 high-entropy amorphous alloy. (1st April 2023)

• Record Type: Journal Article
• Authors: Chong, Kai; Gao, Yu; Zhang, Zhibin; Zou, Yong; Liang, Xiubing
• Is Part Of: Corrosion science. Volume 213(2023)
• Publication Date: 2023-04-01
• Subjects: High-entropy metallic glass -- Thermal stability -- Corrosion resistance -- Passive film; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2023.110979
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: The present study reasonably designed and prepared a novel Zr22.5 Ti22.5 Hf22.5 Ni22.5 Ta10 high-entropy amorphous alloy with excellent thermal stability and corrosion resistance. The hysteresis diffusion effect caused by the high mixing entropy of the multi-principal system affects the formation of the crystalline phase and thus improves thermal stability. The alloy exhibits excellent corrosion resistance compared to 316 L in 3.5 wt% NaCl solution. The XPS results indicate that the passive film of Zr22.5 Ti22.5 Hf22.5 Ni22.5 Ta10 passive film is rich in oxides of Zr, Ti, Hf, and Ta, which has excellent resistance to chloride ion attack. Graphical Abstract: A novel Zr22.5 Ti22.5 Hf22.5 Ni22.5 Ta10 high-entropy amorphous alloy was fabricated successfully by arc melting and single-roller melt spinning. Differential scanning calorimetry (DSC) was used to characterize the thermal properties of amorphous alloys. The nature of the passivation film was investigated by combining electrochemistry and XPS to reveal the mechanism of the excellent corrosion resistance of Zr22.5 Ti22.5 Hf22.5 Ni22.5 Ta10 in 3.5 wt% NaCl solution. ga1 Highlights: A novel Zr22.5 Ti22.5 Hf22.5 Ni22.5 Ta10 high-entropy amorphous alloy was designed and prepared. High melting point Ta element improves thermal stability of Zr22.5 Ti22.5 Hf22.5 Ni22.5 Ta10 . Corrosion resistance of Zr22.5 Ti22.5 Hf22.5 Ni22.5 Ta10 is better than 316 L in 3.5 wt% NaCl solution. Passive film of Zr22.5 Ti22.5 Hf22.5 Ni22.5 Ta10 consisted by multiple oxides. Zr22.5 Ti22.5 Hf22.5 Ni22.5 Ta10 passive film has excellent resistance to chloride ion attack.