On the control of the residual porosity in iron aluminides processed by reactive squeeze-infiltration of aluminium into a preform of steel fibres

Tiberghien, D;Lapin, J.;Ryelandt, Sophie;Delannay, Francis
(2002) Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing — Vol. 323, n° 1-2, p. 427-435 (2002)

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Authors
  • Tiberghien, D
    Author
  • Lapin, J.
    Author
  • Ryelandt, SophieUCLouvain
    Author
  • Delannay, Francisorcid-logoUCLouvain
    Author
Abstract
An original approach for the synthesis of iron aluminides of the type FeAl1-x is presented, based on the use of a squeeze-casting equipment for inducing the reactive infiltration of Al into a porous preform made by sintering continuous Fe-based fibres. The casting is subsequently homogenised by heat treatment in the solid state. Preforms with fibre volume fractions ranging between 40 and 80% (fractions that correspond to stoichiometries close to FeAl and Fe3Al. respectively) are prepared using steel-wool fibres with various diameters. Small fibre diameters and high processing temperatures are found to be beneficial for obtaining, after squeeze casting a low-porosity material with a large amount of uniformly distributed reaction compounds. However, the preform thickness that can be properly infiltrated is limited to about 6 mm. The homogenisation of the intermetallic phase is complete after only 5 h at 1000 degreesC. A major problem to be solved is the heterogeneity of the porosity distribution in the sample after homogenisation. This heterogeneity results from an insufficiently uniform distribution of the fibre volume fraction. (C) 2002 Elsevier Science B.V. All rights reserved.
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Tiberghien, D., Lapin, J., Ryelandt, S., & Delannay, F. (2002). On the control of the residual porosity in iron aluminides processed by reactive squeeze-infiltration of aluminium into a preform of steel fibres. Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing, 323(1-2), 427-435. https://doi.org/10.1016/S0921-5093(01)01379-X (Original work published 2002)