The invention relates to a method for the formation of a high-strength and wear-resistant composite layer on the surface of an aluminium-alloy substrate made from an applied metal filler. Said metal filier comprises an alloy or a powder mixture containing aluminium, silicon, and at least 15 wt. % iron. The alloy or powder mixture arranged on the surface of the aluminium-alloy substrate is fused with a surface component of the aluminium-alloy substrate, by means of irradiating the alloy or powder mixture with a laser.