Abstract
AlNi2Ti–Ti2Ni–NiTi intermetallic alloy consisting of AlNi2Ti primary dendrites and Ti2Ni–NiTi interdendritic phase was fabricated by vacuum arc melting process. Corrosion and wear behaviors of the alloy were characterized using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and wear tests. Electrochemical measurements indicated that the alloy exhibited an excellent corrosion resistance in 0.5 mol/L H2SO4 solutions with a high corrosion potential and wide passivation region (0–1.2 V) due to the formation of compact and protective passive films (TiO2 and Al2O3). Due to the high hardness and strong covalent bonding AlNi2Ti–Ti2Ni–NiTi alloys exhibit excellent wear resistance with a low friction coefficient and wear rate under dry sliding wear conditions. The dominant wear mechanisms of the alloy are friction stress-induced micro-fracture and tribo-oxidation.
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ACKNOWLEDGMENTS
The authors acknowledge Mr. Deshun Liu for their assistance on experiments of arc melting.
Funding
This research was supported by the Natural Science Foundation of Shandong Province of China (Grant no. ZR2018MEM005).
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Zhang, H.X. Microstructure, Wear and Corrosion Resistance of AlNi2Ti–Ti2Ni–NiTi Intermetallic Alloy. Phys. Metals Metallogr. 123, 1419–1426 (2022). https://doi.org/10.1134/S0031918X21101142
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DOI: https://doi.org/10.1134/S0031918X21101142