Sliding wear behavior of two gamma-based titanium aluminides

Lamellar Ti–48Al–2Nb–2Mn (at.%) and Ti–45Al–2Nb–2Mn–1B (at.%) titanium aluminides have been wear tested using a ball-on-disc configuration against a 10-mm-diameter hard steel ball under dry sliding conditions at applied loads of 3.5, 5, 10 and 20 N. The worn surfaces have been characterized using optical microscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy and microhardness measurements.