Wear Properties of Ni₃Al-Ni₃V-Zr-Ni₅Zr Alloys under Different Atmospheres

The study examines the friction and wear properties of Ni 3 Al-Ni 3 V-Zr-Ni 5 Zr alloys under varying gas conditions. The alloy was tested in the presence of oxygen and carbon dioxide using a controlled atmosphere wear tester. The study revealed that the wear environmental embrittlement resulted from the diffusion of reactive atomic hydrogen into the interior of the Ni 3 Al-Ni 3 V alloy. The addition of Zr elements decreased the proportion of Al elements on the surface of the Ni 3 Al-Ni 3 V-Zr-Ni 5 Zr alloy and reduced the proportion of H atoms produced by the chemical reaction between atmospheric water vapour and Al elements. This inhibited the environmental embrittlement and improved the performance of the Ni 3 Al-Ni 3 V-Zr-Ni 5 Zr alloy. The wear performance of Ni 5 Zr alloy is superior to that of Ni 3 Al-Ni 3 V. When exposed to air in an air environment, the surface of Ni 3 Al-Ni 3 V-Zr-Ni 5 Zr alloy forms a protective Al 2 O 3 oxide film on the workpiece, resulting in a reduction of the friction coefficient and wear rate of the alloy. The wear mechanism of the alloy is mainly oxidation wear and abrasive wear. In an oxygen environment, the surface of the alloy generates a significant amount of Al 2 O 3 oxide film. The flaking of the oxide film leads to an increase in the friction coefficient and wear rate of the alloy. In a carbon dioxide environment, the surface of the alloy undergoes severe deformation, and plough lines become apparent. This is accompanied by flaking Si 3 N 4 abrasive chips adhering to the surface of the alloy, which intensifies the wear of the alloy. The primary wear mechanism is abrasive wear. Therefore, the friction coefficient and wear rate of the Ni 3 Al-Ni 3 V-Zr-Ni 5 Zr alloy in the atmosphere are optimal.