Nitrogen addition to iron powder by mechanical alloying |
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Authors: | James C Rawers Dale Govier and Randy Doan |
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Affiliation: | US Department of Energy, Albany Research Center, Albany, 97321 Oregon, USA |
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Abstract: | Nitrogen was alloyed into iron (a) by mechanical processing in a nitrogen gas environment, and (b) by mechanically alloying with iron-nitride powders to characterize resulting nano-structure and nitrogen distribution. Although the infused nitrogen concentration was significantly greater than the thermodynamic equilibrium solubility of iron, no nitrides formed, even for nitrogen concentrations as high as 4.1 wt.% However, a bct Fe phase did form. Lattice expansion calculations indicate that the sum of the interstitial bcc-Fe and bct Fe nitrogen concentrations was significantly less than the total measured nitrogen concentration. A considerable portion of the mechanically infused nitrogen was determined to be associated with nanograin boundaries. |
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Keywords: | Iron Mechanical alloying Nitrogen |
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