Abstract
In this study a hot isostatic pressing (HIP) furnace under high temperature and high nitrogen pressure is used to perform nitrogen diffusion in mechanically processed iron powders. After hipping, the γ′-Fe 4N phase is formed while unreacted b.c.c. iron also remains in the powder. The amount of γ′-Fe 4N is estimated by calculating the relative X-ray diffraction peak intensity. The latter amount increases with increasing milling time because of new surface formation and defect creation. The nitrogen diffusion into grains occurs for a minimum value of the HIP pressure, then the alloying of nitrogen with iron appears for a minimum temperature. Mössbauer and EXAFS analyses indicate that the iron nitride is mainly located at the surface of the powder grains.
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