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High-temperature phase transformations of iron anhydrous ammonia system realized by ball milling at room temperature

Version 2 2024-06-03, 13:32
Version 1 2017-05-16, 15:59
journal contribution
posted on 2024-06-03, 13:32 authored by Ying (Ian) ChenYing (Ian) Chen, JS Williams, GM Wang
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.

History

Journal

Journal of applied physics

Volume

79

Pagination

3956-3962

Location

Melville, N.Y.

ISSN

0021-8979

Language

eng

Publication classification

CN.1 Other journal article

Copyright notice

[1996, AIP Publishing]

Issue

8

Publisher

AIP Publishing,

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