Mechanically activated synthesis studied by X-ray diffraction in the Fe–Al system

The nanocrystalline phase formation in the Fe–Al binary system induced by a new low temperature process, called ‘mechanically activated self-propagating high-temperature synthesis (MASHS)’, was investigated by X-ray diffraction (XRD) analysis. Some parameters of this alternative powder processing me...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 1999-04, Vol.262 (1), p.279-288
Main Authors: Charlot, F., Gaffet, E., Zeghmati, B., Bernard, F., Niepce, J.C.
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
FeAl intermetallic
Materials science
Materials synthesis
materials processing
Mechanical activation
Metals. Metallurgy
Methods of materials synthesis and materials processing
Nanostructure
Physics
Self-propagating reaction
X-ray diffraction
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Summary:The nanocrystalline phase formation in the Fe–Al binary system induced by a new low temperature process, called ‘mechanically activated self-propagating high-temperature synthesis (MASHS)’, was investigated by X-ray diffraction (XRD) analysis. Some parameters of this alternative powder processing method which associates a short ball milling duration (leading to nanoscale 3-D polyinterfaces of the elemental components) and a self-propagating high-temperature synthesis (SHS) reaction, were studied. Their influence on the solid (liquid) state kinetic paths of phase formation was characterized. The XRD profile line analysis shows that it is possible to synthesize, for example, an FeAl intermetallic compound possessing a nanostructure (40 nm) using the MASHS process. Moreover, an infrared camera revealed that the mechanical activation step implemented before the SHS process decreases the ignition temperature of the exothermic reaction (100 K) between pure Fe and Al, whatever the composition.
ISSN:0921-5093
1873-4936
DOI:10.1016/S0921-5093(98)01017-X