Slip Band Distribution and Morphology in Cyclically Deformed Nickel Polycrystals with Ion Beam Mixed Surface Films

摘要

It is shown that surface modification by ion beam mixing produces potentially beneficial effects on cyclic deformation phenomena associated with fatigue crack initiation. The principal effects of the modifications are to suppress the formation of the notch-peak surface topography of persistent slip bands (PSBs) and inhibit the net extrusion of PSBs from the free surface. The dominant ''failure mode'' of the surface is changed from extrusion and notch formation to surface film rupture. (ERA citation 12:006822)