Dry sliding wear behavior of Fe–28Al and Fe–28Al–10Ti alloys

Dry or unlubricated sliding wear tests were carried on Fe–28Al and Fe–28Al–10Ti alloys produced by hot isostatic pressing (HIP) of powders. Since the Ti addition was found to lower both the wear rate and the coefficient of friction significantly, most of the detailed experiments were carried out on Fe–28Al–10Ti. The wear rate increased with the increase in applied load, speed and temperature, while the steady-state values of the coefficients of friction were affected little by them. Plastic deformation and the delamination or peeling-off of surface layers from the wear track were found to be the basic mechanisms in the mild sliding conditions (low load and speed) and in the severe ones (high load and speed), respectively. The wear rate was found to have a clear correlation with the strain-hardening rate but neither with the hardness nor with the yield strength. This implies that the wear properties may be related more keenly with dynamic mechanical properties than static ones.