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Oxidation resistance of spark plasma sintered Ti6Al4V-TiN composites

Kgoete, F. and Popoola, A. P. I. and Fayomi, O. S. I (2019) Oxidation resistance of spark plasma sintered Ti6Al4V-TiN composites. Journal of Alloys and Compounds. pp. 943-948.

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This work investigate the elevated temperature oxidation of Ti6Al4V and Ti6Al4V-xTiN composites using thermal gravimetric analyser (TGA) in air at 45e800 �C. Samples prepared for the study were developed by spark plasms sintering technique at a temperature of 1000 �C with a holding time of 6min under a pressure of 50 MPa. The alloy was admixed with varying proportions of TiN varying from 5 to 15 wt% and the effect of the ceramic additions on the thermally gravimetric analyzed samples were investigated. Scanning electron microscope attached with energy dispersive spectroscopy (SEM-EDS) was used to explore the oxide layer formed on the surface of the samples. The phases present in the oxidized samples were observed by energy dispersive X-ray diffraction spectrometer (XRD). Microhardness property was studied by the means of high impact diamond Dura scan micro hardness tester. The results showed that the reinforced Ti6Al4V with TiN significantly improved the oxidation resistance, and hardness of Ti6Al4V alloy which is compactable and beneficial for aerospace application. Ti-6Al-4V alloy reinforced with 5wt %TiN yielded better results, with improved hardness value of 881.15 HV and less weight gain which indicates high temperature oxidation resistance.

Item Type: Article
Uncontrolled Keywords: Spark plasma sintering TGA Oxidation resistance Ceramic Oxide layer
Subjects: T Technology > T Technology (General)
T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User: Mrs Hannah Akinwumi
Date Deposited: 15 Nov 2018 14:43
Last Modified: 23 Apr 2019 10:12

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