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A study on the formation of iron aluminide (FeAl) from elemental powders

Sina, Hossein LU ; Corneliusson, J.; Turba, Krystof LU and Iyengar, Srinivasan LU (2015) In Journal of Alloys and Compounds 636. p.261-269
Abstract
The formation of iron aluminide (FeAl) during the heating of Fe-40 at.% Al powder mixture has been studied using a differential scanning calorimeter. The effect of particle size of the reactants, compaction of the powder mixtures as well as the heating rate on combustion behavior has been investigated. On heating compacted discs containing relatively coarser iron powder, DSC data show two consecutive exothermic peaks corresponding to precombustion and combustion reactions. The product formed during both these reactions is Fe2Al5 and there is a volume expansion in the sample. The precombustion reaction could be improved by a slower heating rate as well as a better surface coverage of iron particles using relatively finer aluminum powder.... (More)
The formation of iron aluminide (FeAl) during the heating of Fe-40 at.% Al powder mixture has been studied using a differential scanning calorimeter. The effect of particle size of the reactants, compaction of the powder mixtures as well as the heating rate on combustion behavior has been investigated. On heating compacted discs containing relatively coarser iron powder, DSC data show two consecutive exothermic peaks corresponding to precombustion and combustion reactions. The product formed during both these reactions is Fe2Al5 and there is a volume expansion in the sample. The precombustion reaction could be improved by a slower heating rate as well as a better surface coverage of iron particles using relatively finer aluminum powder. The combustion reaction was observed to be weaker after a strong precombustion stage. Heating the samples to 1000 degrees C resulted in the formation of a single and stable FeAl phase through the diffusional reaction between Fe2Al5 and residual iron. DSC results for compacted discs containing relatively finer iron powder and for the non-compacted samples showed a single combustion exotherm during heating, with Fe2Al5 as the product and traces of FeAl. X-ray diffraction and EDS data confirmed the formation of FeAl as the final product after heating these samples to 1000 degrees C. (C) 2015 Elsevier B.V. All rights reserved. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
keywords
Iron aluminide, Intermetallics, Ignition reaction, DSC, Onset, temperature
in
Journal of Alloys and Compounds
volume
636
pages
261 - 269
publisher
Elsevier
external identifiers
  • wos:000351836600043
  • scopus:84924291976
ISSN
0925-8388
DOI
10.1016/j.jallcom.2015.02.132
language
English
LU publication?
yes
id
4f04cd50-d0e9-40b0-8677-c2db9e29c531 (old id 5277706)
date added to LUP
2015-04-24 09:10:56
date last changed
2017-11-05 03:53:14
@article{4f04cd50-d0e9-40b0-8677-c2db9e29c531,
  abstract     = {The formation of iron aluminide (FeAl) during the heating of Fe-40 at.% Al powder mixture has been studied using a differential scanning calorimeter. The effect of particle size of the reactants, compaction of the powder mixtures as well as the heating rate on combustion behavior has been investigated. On heating compacted discs containing relatively coarser iron powder, DSC data show two consecutive exothermic peaks corresponding to precombustion and combustion reactions. The product formed during both these reactions is Fe2Al5 and there is a volume expansion in the sample. The precombustion reaction could be improved by a slower heating rate as well as a better surface coverage of iron particles using relatively finer aluminum powder. The combustion reaction was observed to be weaker after a strong precombustion stage. Heating the samples to 1000 degrees C resulted in the formation of a single and stable FeAl phase through the diffusional reaction between Fe2Al5 and residual iron. DSC results for compacted discs containing relatively finer iron powder and for the non-compacted samples showed a single combustion exotherm during heating, with Fe2Al5 as the product and traces of FeAl. X-ray diffraction and EDS data confirmed the formation of FeAl as the final product after heating these samples to 1000 degrees C. (C) 2015 Elsevier B.V. All rights reserved.},
  author       = {Sina, Hossein and Corneliusson, J. and Turba, Krystof and Iyengar, Srinivasan},
  issn         = {0925-8388},
  keyword      = {Iron aluminide,Intermetallics,Ignition reaction,DSC,Onset,temperature},
  language     = {eng},
  pages        = {261--269},
  publisher    = {Elsevier},
  series       = {Journal of Alloys and Compounds},
  title        = {A study on the formation of iron aluminide (FeAl) from elemental powders},
  url          = {http://dx.doi.org/10.1016/j.jallcom.2015.02.132},
  volume       = {636},
  year         = {2015},
}