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A 3×3 matrix of samples has been ion implanted with nitrogen at low-to-high doses and low-to-high current densities (dose rates). All samples show surface exfoliation which results in a loss of the implanted nitrogen and a consequent loss of the wear-resistant properties—a condition of over-implantation reminiscent of that observed with metal ion implantation. There is an uptake of post-implantation...
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