Two nitrogen alloying techniques are described by which the nitrogen concentration in Fe–2Al was increased from less than 0·1 wt-% in the original powder to approximately 2 wt-%. X-ray diffraction is used to characterise the nitrogen distribution within the powders. The nitrogen in mechanically processed powders was found to be interstitial while the nitrogen added during high pressure, high temperature diffusion produced second phase iron (or possibly iron-aluminium) nitride precipitates. PM/0624
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