Abstract
The effect of aluminum and boron ion implantation on strain-controlled (low cycle) and stress-controlled (high cycle) fatigue behavior of polycrystalline copper was investigated. The cyclic stress-strain, strain-life and stress-life relations, cyclic slip and crack nucleation behavior of implanted copper are compared with those of unimplanted copper. Under strain control, ion-implanted samples show a lower degree of cyclic hardening and longer fatigue lives than their non-implanted counterparts. Aluminum implantation has a larger effect than boron implantation. Under stress control the fatigue life and the fatigue limit are observed to increase for the aluminum-implanted samples compared with their non-implanted counterparts. These changes in fatigue behavior are associated with changes in deformation behavior in the surface region and surface residual stresses created by ion implantation.
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