Co-continuous Al/Al2O3 composite produced by liquid displacement reaction: Relationship between microstructure and mechanical behavior

Co-continuous 63%Al2O3/37%Al(Si) composite, known as C4 composite, was produced by submersion of silica glass specimens in a molten metal bath. The effect of temperature and composition of the metal bath on the reactive penetration rate was investigated. An infiltration speed exceeding 2 mm/h, incre...

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Bibliographic Details
Published inJournal of materials science Vol. 38; no. 17; pp. 3567 - 3577
Main Authors LA VECCHIA, G. M, BADINI, C, PUPPO, D, D'ERRICO, F
Format Journal Article
LanguageEnglish
Published Heidelberg Springer 01.09.2003
Springer Nature B.V
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Summary:Co-continuous 63%Al2O3/37%Al(Si) composite, known as C4 composite, was produced by submersion of silica glass specimens in a molten metal bath. The effect of temperature and composition of the metal bath on the reactive penetration rate was investigated. An infiltration speed exceeding 2 mm/h, increasing with temperature, and suitable for practical applications, was observed above 1100°C. Mechanical properties of C4 specimens were measured, at room temperature, and related to composite microstructure. This latter was investigated by optical and scanning electron microscopy, electron probe microanalysis, X-ray diffraction and porosimetry.The strong interfacial bonds between metal and ceramic resulted in low thermal expansion, high stiffness, and good compression and bending strength. On the contrary, the composite showed a rather poor tensile strength, due to a high ceramic percentage and, partially, to porosity. In spite of the low ductility shown by the investigated composite, the metal network provides a toughening effect, which resulted in a ductile micro-mechanism of fracture, localized in the zones characterized by the presence of the metal matrix.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0022-2461
1573-4803
DOI:10.1023/A:1025613011787