Abstract
The formation, distribution, and surface morphology of persistent slip band (PSB) structures have been studied in polycrystalline nickel with ion beam microalloyed Ni-Al surface layers. Both supersaturated solid solutions of Al in Ni andγ-γ′ dual-phase structures were formed on surfaces of low cycle fatigue specimens by ion beam mixing vapor-deposited Ni and Al layers, using 1 × 1016 ions/cm2 of Kr+ at 0.5 MeV. When cycled to saturation at constant plastic strain ranges between 6 × 10-5 and 7 × 10-3, ion beam modified specimens showed a retardation in the appearance of PSB's at the surface, and a reduction in their numbers and intensities at cyclic saturation. Slip bands that eventually emerged at ion beam modified surfaces displayed morphological features which differed sharply from the PSB notch-peak topographies usually found in fatigued fcc metals. Further, it was found that subsurface strain localization occurred in the presence of the modified surface layer, generating PSB's in the bulk which extended to the underside of the layer, but did not penetrate it. This behavior may be understood in terms of the resistance of the surface layer to plastic deformation, and the localized stresses produced in the surface film as a result of subsurface strain localization.
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Formerly with The University of Michigan at Ann Arbor
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Grummon, D.S., Jones, J.W. & Was, G.S. Fatigue damage accumulation in nickel modified by ion beam surface microalloying. Metall Trans A 19, 2775–2788 (1988). https://doi.org/10.1007/BF02645812
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DOI: https://doi.org/10.1007/BF02645812