Differences in the microstructure of iron mechanically processed powder alloyed with interstitial and substitutional elements
- Old Dominion University, Norfolk VA
Mechanically processing iron powder with interstitial and substitutional elements resulted in different microstructures (grain size, rms-strains, and phases) depending upon the alloying composition. Alloying iron powder with substitutional elements (approximately 4 at% Al, Cr, Nb, and Ti) resulted in a microstructure similar to mechanically processed iron powder: grain size ≈7nm, local, rms strain ≈0.5%, and bcc-Fe nanograins. Small reductions in grain size and increase in rms strain occurred with increasing radius of the substitute alloy atoms. Substitutional atoms were not uniformly distributed throughout the bcc-Fe matrix, but were distributed in clusters within the nanosgrains and/or as a thin coating on the grain boundaries. Alloying iron powder with interstitial elements (4–8 at% C and N) resulted in significantly different microstructures: decrease in grain size and increase in rms-strain occurred with inceasing the interstitial concentration and a bct-Fe nanograin phase developed. Interstitial atoms were also predominately distributed in clusters and/ or in a thin region along or in the grain boundaries of the iron nanograins.
- Research Organization:
- Albany Research Center (ARC), Albany, OR (United States)
- Sponsoring Organization:
- USDOE - Office of Fossil Energy (FE)
- DOE Contract Number:
- None cited
- OSTI ID:
- 923367
- Report Number(s):
- DOE/ARC-1997-017; TRN: US200804%%1090
- Journal Information:
- NanoStructured Materials, Vol. 9, Issue 1-8; Conference: Third International Conference on Nanostructured Materials (NANO’96), Kona, HI, July 8-12,1996; ISSN 0965-9773
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
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