Microstructure, densification, microhardness and antioxidant properties of Ti₂AlN/TiN FGM fabricated by hot-pressing

Abstract

Ti₂AlN/TiN functionally graded materials (FGM) were successfully fabricated by vacuum hotpressing. Bulk density of the sintered samples was measured by Archimedes principle. The sample sintered at 1 300 °C for 2 h has the maximum final density and lowest open porosity. SEM coupled with EDS was utilized to investigate the phase composition and microstructure, and well-formed boundary was found between the layers. The microhardness tests suggest that Vickers’ hardness of Ti₂AlN/TiN FGM increases monotonically with the volume fraction content of TiN increases. Corrosion results are that the corrosion resistance of Ti₂AlN/TiN FGM is much better than that of Ti₂AlN in acid, but quite the opposite in alkali. Constant temperature oxidation study shows that the oxidation kinetics of Ti₂AlN/TiN FGM at 900 °C follows the parabolic law closely.

Keywords

Ti₂AlN / TiN / functionally graded material (FGM)

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