In this work the tribological properties of powder aluminium alloys (Al + Al 2 O 3 , Al + C) and cast aluminium were investigated after nitrogen implantation (energy 30 keV, implantation dose 2 10 1 7 ions cm - 2 ). Phase analysis of the surface modified layer was conducted using X-ray diffraction. Auger electron spectroscopy measurements were also performed to obtain composition and depth profiles of the implanted layer. It was found that implantation led to an increase in the initial friction coefficient of the powder alloy Al + C and cast aluminium. The formation of the AlON phase in the surface layer took place during implantation, according to data of the phase and element composition analysis.