Abstract
Strain induced and excess strain-free surfaces of Nimonic-90 alloy were studied following N + 2 and 11B + ion implantation. The energy of the ions was 130 keV at a dose of 2.5 × 10 21 ions m -2. Techniques such as Auger electron spectroscopy and X-ray photoelectron spectroscopy were used to characterize the implanted layer. In the strain induced surface samples implanted with N + 2 and 11B + ions, a relative increase in surface hardness of ∼ 90% and 50% respectively was observed at a load of 19.62 mN. In the excess strain-free surface samples implanted with N 2 + and 11B + ions, at the same load, a relative increase of ∼ 110% and 60% respectively was observed. The possible correlation of increase in near surface hardness with nitride or boride formation is discussed.
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