ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
α-Fe powder has been ball milled at room temperature in an anhydrous ammonia atmosphere for various times. The composition and structure of milled powders was investigated using x-ray diffraction spectroscopy, Mössbauer spectroscopy, combustion elemental analysis, and thermal analysis. A high temperature reaction sequence was observed during milling in the nitrogen composition range from 3.75 to 5.56 wt %. The nitriding reaction sequence has been established as a function of milling time. An increase of nitrogen in the powder with an increase of milling time produces a progression to iron nitride phases richer in nitrogen. A distinct similarity is found between nitriding reaction processes during high-energy ball milling and nitrogen ion implantation into iron. Additionally, an inverse (dissociation) reaction sequence is observed during thermal treatments of ball-milled iron powders. © 1996 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.361822
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