Thermal stability of FeAl intermetallics prepared by SHS sintering

The microstructural evolution of dense nanostructured FeAl produced by mechanical and field activation was investigated over a range of annealing temperature from room temperature to 750°C. In-situ and exsitu X-ray diffraction experiments were performed to determine the evolution of the crystallite...

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Bibliographic Details
Published in:International journal of self-propagating high-temperature synthesis 2008-09, Vol.17 (3), p.183-188
Main Authors: Paris, S., Pighini, C., Gaffet, E., Munir, Z. A., Bernard, F.
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Materials Science
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Summary:The microstructural evolution of dense nanostructured FeAl produced by mechanical and field activation was investigated over a range of annealing temperature from room temperature to 750°C. In-situ and exsitu X-ray diffraction experiments were performed to determine the evolution of the crystallite size and microdistorsion rate during annealing in an inert atmosphere. The results show the existence of two temperature domains: (i) below 500°C, the crystallite size remained relatively unaffected while the microdistorsions were eliminated and (ii) above 500°C, the crystallites exhibited significant growth leading to the destruction of the nanostructure. In addition, the microhardness changes versus the crystallite size was consistent with prediction of the Hall-Petch effect.
ISSN:1061-3862
1934-788X
DOI:10.3103/S1061386208030047