Abstract
The thermal evolution of Fe 2 N-type nitride precipitates in Fe metal obtained for N 2 + implantation is shown to be altered by post-bombardment ofa-particles at fluences of 1015 cm −2 . These effects as detected using 57 Fe Conversion Electron Mössbauer Spectroscopy are observed to depend on the type of nitride precipitate present when the a particles are implanted. In the two cases studied intermediate nitrogen rich phases (ε-Fe 3 N are detected in addition to the normal terminal phase γ′'-Fe 4 N. The terminal phase is also restored in the implanted zone at temperatures higher than normal when Fe 2 N-type precipitates arc present during a bombardment. § On leave at the Centre de Recherches Nucléaires, Strasbourg, France.
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