Reactividad entre whiskers de a-SiC y aluminio durante el procesado por vía líquida de materiales compuestos de matriz metálica
- A. Ureña
- J.M. Gómez de Salazar
- P. Rodrigo
- L. Gil
- E. E. Martínez
- J. L. Baldonedo
ISSN: 0366-3175
Year of publication: 1999
Volume: 38
Issue: 3
Pages: 193-199
Type: Article
More publications in: Boletín de la Sociedad Española de Cerámica y Vidrio
Abstract
The reactivity between a-SiC whiskers and an aluminium alloy (Al-Cu-Mg), both present in a metal matrix composite, has been studied when such matrix is in molten state. Using mainly transmission electron microscopy (TEM) and electron microdiffraction (ED), the nature and morphology of the reaction products generated at the a-SiC/aluminium interface, when this last melts under different condition which simulate casting and welding procedures for metal matrix composites, have been characterised. Both the formation of Al4C3 aggregates with platelet morphology generated by dissolution-reaction mechanisms, and aciculate crystals of the same carbide form by complete dissolution of the a-SiC whiskers and later Al4C3 precipitation into the molten aluminium. Ternary Al-Si carbides with high chemical stability have been also identified by TEMED (b-Al4SiC4), being its formation related with higher energetic conditions than for the Al4C3.