Abstract
An atom probe field ion microscopy characterization has been performed on a ∑9 grain boundary in an Fe-45at%Cr alloy that was aged for 500 h at 500°C. This boundary was decorated with a semicontinuous film of chromium nitride precipitates. The interior of the grains consisted of an ultrafine mixture of chromium-enriched α phase that were produced by spinodal decomposition. The scale of this isotropic α-α' microstructure was found to be constant up to the grain boundary. A 5 to 10 nm thick chromium-depleted zone that was denuded in the α' phase was observed adjacent to the chromium nitride precipitates.
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