Abstract
Nickel-chromium (Ni-12Cr, wt.%) andcobalt-chromium (Co-12Cr, wt.%) alloys were ionimplanted with 150 keV yttrium to fluences that rangedbetween 2 × 1016 and 1 ×1017 ions/cm2. The influence ofthe implantation on the microstructure of the alloy wasdetermined. The effect of the highest dose implantationon the alloys' oxidation response at 1000°C, 48 hrwas measured. Both alloys contained an amorphous surface phase as a result of this fluence and one ofthe effects of oxidation was to recrystallize theamorphized alloy in the first few minutes of oxidation.The lower doses of 2 × 1016ions/cm2 were sufficient to cause amorphization of both the Ni-12Cr andthe Co-12Cr. The implantation reduced the isothermalmass gain by a factor of 25% for the Ni-12Cr, but had anegligible effect on the Co-12Cr alloy. Short-term oxidation experiments at 600°C showed viatransmission electron microscopy that, in the absence ofthe yttrium implant, the Ni-12Cr alloy forms NiO in thefirst minute of oxidation and the Co-12Cr alloy forms CoO and CoCr2O4.The implanted Ni-12Cr, on the other hand (1 ×1017Y+/cm2), formsrecrystallized Ni-Cr, Y2O3, andNiO in the near-surface region, while the implantedCo-12Cr alloy forms CoO, CoCr2O4, and a recrystallized intermetallic alloy fromthe amorphized region.
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Hampikian, J.M. The Effects of Reactive-Element, Ion-Implantation-Induced Amorphous Layers on the Oxidation of Co-12Cr and Ni-12Cr Alloys. Oxidation of Metals 50, 123–138 (1998). https://doi.org/10.1023/A:1018828002557
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DOI: https://doi.org/10.1023/A:1018828002557