Mechanical properties of innovative metal/ceramic composites based on freeze-cast ceramic preforms
This article provides an overview of recent research carried out about the mechanical properties of an innovative metal/ceramic composite fabricated by squeeze-casting liquid Al-12Si in freeze-cast alumina preforms. The composite consists of domains made of alternating metallic and ceramic lamellae. Elastic and elastic-plastic deformation behavior and mechanism of internal load transfer under external compressive stresses in individual domains with different orientations were studied. Results show that the stiffness is highest along the freezing direction and lowest along the direction perpendicular to it. When compressed along directions parallel to freezing direction, the composite is strong and brittle. When compressed along other directions, the behavior is controlled by the soft metallic alloy. Studies of internal load transfer under external compressive stress along different directions show that the mechanism of internal load transfer differs significantly when loading direction changes from that along the freezing direction to the direction perpendicular to it.
KeywordsMetal Matrix Composite Lamella Spacing Domain Orientation Ceramic Preform Freezing Direction
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- 2.Chawla N, Chawla KK (2006) Metal matrix composites. Springer, New YorkGoogle Scholar
- 3.Lloyd DJ (1997) in Mallick PK (ed) Composites Engineering Handbook, Marcel Dekker Inc.Google Scholar
- 6.Mattern A (2005) Metall-Keramik-Verbundwerkstoffe mit Isotropen und Anisotropen Al2O3 Verstärkungen. Dissertation: Universität Karlsruhe (TH)Google Scholar
- 8.Wanner A (1998) Elastic moduli measurements of extremely porous ceramic materials by ultrasonic phase spectroscopy. Mater. Sci. Engg. A248: 35 – 43Google Scholar