Metastable phase formation and enhanced diffusion in f.c.c. alloys under high dose, high flux nitrogen implantation at high and low ion energies

作者: DL Williamson , Orhan Ozturk , Rong Wei , Paul J Wilbur

DOI: 10.1016/S0257-8972(94)80003-0

关键词: IonNitridingMetastabilityAlloyAusteniteCrystallographyMaterials scienceIon implantationConversion electron mössbauer spectroscopyAnalytical chemistrySolid solution

摘要: The use of elevated target temperatures near 400 °C during high flux ion implantation N2+ at energies ranging from 60 keV to 0.4 leads a metastable, f.c.c. nitrogen solid solution phase induced in austenitic (f.c.c.) Cr-containing stainless steels. This has not been produced an Ni-Fe alloy containing no Cr. Penetration depths the N are significantly larger than expected on basis known diffusion coefficients steels or pure f.c.c.-Fe. X-ray diffraction data suggest unusual differences penetration and concentration depending grain orientation. Consideration is given possible residual stresses by expansion lattice anisotropic elastic constants for amount interstitial approaches 40 at.% under lower energy, higher conditions, but only (200) crystallographic planes parallel surface. N-expanded with highest found conversion electron Mossbauer spectroscopy be magnetic AISI 304 310 A comparison our results those related methods such as conventional plasma nitriding pulsed made demonstrate that observed metastable often other provided appropriate processing times used. similar various consistent thermal solubility enhanced metastability associated low Cr mobility below about 450 strong N-Cr bond. Evidence vacancy-enhanced we see present advantage using 2 these producing surfaces optimized tribological behavior based extremely strength, phase.

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