In situ time-resolved diffraction coupled with a thermal I.R. camera to study mechanically activated SHS reaction: Case of Fe-Al binary system

Journal Article · Fri Jan 15 04:00:00 EST 1999 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(98)00368-1· OSTI ID:329060

Charlot, F ^[1]; Bernard, F; Niepce, J C ^[1]; Gaffet, E ^[2]; Klein, D ^[3]

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1. CNRS, Dijon (France). Lab. de Recherches sur la Reactivite des Solides
2. UPR CNRS, Belfort (France)
3. LMIT Pole Univ. Belfort-Montbeliard, Montbeliard (France)

Mechanically activated self-propagating high-temperature synthesis (MASHS) provides an attractive practical alternative to the conventional methods of producing intermetallic compounds, such as iron aluminides. This process involves mainly the combination of two steps; the first step, a mechanical activation, where pure elemental (Fe + Al) powders were co-milled inside a planetary mill, for a short time at given frequency and energy shocks and, the second step, a self-propagating high-temperature synthesis (SHS) reaction, which uses the exothermicity of the Fe + Al reaction. Once ignited with an external source, these reactions become self-sustained and propagate to completion within seconds. The combustion front directly leads to the formation of a nanometric Fe-Al intermetallic with a relative density of 70--80%. To understand this self-sustained reaction, an in situ study in real time was investigated on samples which differ by the shock power during milling and the compaction pressure (porosity). When the combustion front goes through the sample, the time-resolved X-ray diffraction experiment (TRXRD) using synchrotron radiation coupled with an infrared thermography allows the in situ study of the phase formation and the temperature evolution during the MASHs process.

• OSTI ID: 329060
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 2 Vol. 47; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CHEMICAL REACTIONS
INTERMETALLIC COMPOUNDS
IRON ALLOYS
MILLING
PHASE STUDIES
REACTION HEAT
X-RAY DIFFRACTION