Microstructure and Corrosion Property of Equiatomic AlNiZrCuY High Entropy Amorphous Composite Material

Abstract:

A new kind of equiatomic AlNiZrCuY high entropy amorphous composite material (denoted as HEACM) ribbons was prepared by vacuum arc melting technology and rapid quenching system. The microstructure and phase stability of HEACM were characterized by means of X-ray diffraction (XRD), scanning electron microscope (SEM) and differential scanning calorimetry (DSC), and the hardness was measured by Vickers microhardness test methods. All tests were performed in simulated seawater (3.5 wt.% NaCl corrosive solution) at room temperature by CHI660E electrochemical workstation. The corrosion resistance of Al20Ni20Zr20Cu20Y20 was investigated by potentiodynamic polarization curve (Tafel) and electrochemical impedance spectroscopy (EIS). The results show that Al20Ni20Zr20Cu20Y20 HEACM is composed of amorphous phase and intermetallic compounds. The actual density measured by Archimedes method is about 5.792 g/cm3. The Vickers microhardness of this composite material is 461 HV0.1. Its breakdown potential (Eb) is -0.215 V and maintaining passivity current density (ipass) is 29.44 μA/cm2. The equiatomic AlNiZrCuY high entropy amorphous composite material has broad application prospect in the field of corrosion resistance and wear resistance on metal surface.