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- Title
An Experimental Study on the Role of Partial Replacement of Y with Ce in a Novel Quinary AlNiCoYCe<sub>x</sub> High Entropy Metallic Glasses.
- Authors
Zhang, Shuyan; Zhang, Zhibin; Li, Xu; Gao, Yangyang; Liang, Xiubing
- Abstract
For the balanced consumption of pricey rare-earth element yttrium (Y) and improved pitting corrosion resistance of alloys, Y was partially substituted by cerium (Ce) in a novel kind of quinary AlNiCoYCex high-entropy metallic glass (HE-MG) via vacuum arc melting and rapid solidification. The microstructure, thermal stability and micro-hardness of Al30Ni30Co8Y32-xCex (x = 1, 2, 3, 4, 5, and 8 at%) high-entropy metallic glass ribbons (hereafter referred to as HE-MG ribbons) have been systematically investigated. In addition, the electrochemical corrosion properties of these amorphous ribbons with different Ce content in 3.5 wt.% NaCl solution have been determined by potentiodynamic polarization and electrochemical impedance spectroscopy. After 100 h immersion in corrosive media, scanning electron microscope images of the corroded ribbons were also characterized. The results indicated that these ribbon samples could remain in an amorphous state, and the that micro-hardness was more than 495 HV0.1. With increasing Ce content, the thermal stability started to gradually increase and then decrease. Furthermore, Ce is responsible for an improvement in anticorrosion performance compared with the Ce-free alloys. Ce-containing HE-MG ribbons showed a passive region in the electrochemical reaction, and ribbons with 3 at% Ce exhibited the most corrosion resistance by virtue of the smallest Icorr and Ipass.
- Subjects
METALLIC glasses; ELECTROLYTIC corrosion; VACUUM arcs; ALLOYS; PITTING corrosion; SCANNING electron microscopes; CORROSION in alloys; CORROSION resistance
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2022, Vol 74, Issue 11, p4215
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-022-05426-6