等原子比AlNiZrCuY轻质高熵非晶合金的组织与耐腐蚀性能

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

摘要:

利用真空电弧熔炼技术与急速冷却快淬设备制备了一种等原子比AlNiZrCuY高熵非晶复合材料薄带，利用X射线衍射仪（XRD）、扫描电子显微镜（SEM）、差示扫描量热仪（DSC）、显微硬度计等手段表征了该复合材料的显微结构、相稳定性并测定其硬度；通过极化曲线和电化学阻抗谱等测试方法研究了高熵非晶复合材料室温下在模拟海水（3.5 wt.% NaCl水溶液）中的防腐蚀性能。结果表明：Al20Ni20Zr20Cu20Y20高熵非晶复合材料是由非晶态组织与金属间化合物相共同组成；利用阿基米德排水法测得材料实际密度约为5.792 g/cm3；其维氏显微硬度为461 HV0.1，击破电位(Eb)为-0.215 V，维钝电流密度( ipass)为29.44 μA/cm2。该高熵非晶复合材料在金属表面防腐与耐磨领域应用前景广阔。

关键词:高熵非晶复合材料;组织结构;耐腐蚀性能;热稳定性;硬度

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.

Key words:high entropy amorphous composite material; microstructure; corrosion property; thermal stability; hardness