Abstract

In this investigation, Ti–45Al–2Nb–2Mn–1B (at%) titanium aluminide was thermally oxidised at different temperatures of 700–950 °C and at different times. Most oxidation exposures resulted in the formation of a compound layer consisting of several oxide layers, a TiO 2 layer as the outermost layer on top of a layer of Al 2O 3 particles, a mixed layer of TiO 2 + Al 2O 3 underneath, and TiN and Ti 2AlN were found at the interface of the compound oxide layer and the matrix. The compound layers were wear tested using a ball-on-disc configuration against 10 mm diameter hard steel (AISI 52100) balls under dry sliding conditions at applied loads of 20, 50, 80 and 100 N. The oxide layers and worn surfaces were characterized using optical microscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), glow discharge spectroscopy (GDS) and microhardness measurements. Steel was transferred to the oxidised surfaces without any considerable deformation of the surfaces. In general, the wear resistance of oxidised surfaces of titanium aluminide was several times higher than that of untreated surfaces.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.