Three different rapidly solidified Ni-Mo-Fe-B alloys were produced by chill block melt spinning. The ribbons were pulverized, then consolidated by extrusion after being heated for 2 hours at 1100°C. The consolidated specimens were aged isochronally in the range of 400°C to 1100°C for 1 hour, and the age hardening behaviors were studied. Additionally, the extruded alloys were age hardened under an optimized heat treatment condition of 800°C for 4 hours. The microstructures, room and elevated temperature hardnesses, and wear properties of the alloys were evaluated for a possible application to high performance automotive engines.