Effects of Yttrium (Y) Substitution by Cerium (Ce) on Microstructure and Corrosion Behavior ofNear-Equiatomic Alniy Medium-Entropy Amorphous Alloy Ribbons

Archives of Metallurgy and Materials

article

Shuyan Zhang¹  Zhibin Zhang²  Xin Wang²  Yangyang Gao¹  Xiubing Liang² 

[1] ZHEJIANG UNIVERSITY, OCEAN COLLEGE;DEFENSE INNOVATION INSTITUTE, ACADEMY OF MILITARY SCIENCES OF THE PLA OF CHINA

关键词: Medium-entropy amorphous alloys;    Corrosion behavior;    Thermal stability analysis;    Microstructure;    Cerium content;   

DOI  :  10.24425/amm.2022.137800

学科分类：物理（综合）

来源: Akademia Gorniczo-Hutnicza im. Stanislawa Staszica / University of Mining and Metallurgy

【 摘 要 】

Through partially replacing Y element, Ce was added into near-equiatomic AlNiY medium-entropy amorphous alloy (denotedas MEAA) ribbons by the melt spinning process in this study. The differences of microstructure, thermal stability, hardness andcorrosion resistance of Al33.3Ni33.3Y33.4-xCex (x = 0, 2, 5, 8, 13) alloy ribbons were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), differential scanning calorimeter (DSC) and Vickers-type hardness tester. The anti-corrosionperformance in 3.5 wt.% NaCl solution of alloy ribbons was investigated elaborately through the general potentiodynamicpolarization curves (Tafel) and electrochemical impedance spectroscopy (EIS). Results suggested that all ribbon samples couldremain amorphous structure and the hardness are all above 510 HV0.1. With the increase of Ce content, the thermal stabilitybegins to be gradually lower. However, according to the analysis of crystallization kinetics, all types of MEAA ribbons presentsthe relatively prominent thermal stability compared with traditional Al-based amorphous alloys. The corrosion current densityraises firstly, then shows a decreasing trend, and has a slight increase at last. Therefore, appropriate content of Ce element canimprove the corrosion protection performance of alloy ribbons and the 5 at.% Ce MEAA ribbons exhibited the excellent corrosionresistance in this study.

【 授权许可】

CC BY-NC