Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 68, Issue 5, Pages 1136-1143Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2007.06.013
Keywords
metal matrix composites; mechanical properties; anisotropy; elastic properties; ultrasonics
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Innovative metal/ceramic composites produced by melt infiltration of ceramic preforms prepared by a freeze-casting technique are examined in this study. These composites exhibit a characteristic hierarchical structure: On a mesoscopic length scale, lamellar domains with sizes up to several millimetres are observed. The aim of the present study was to analyze the anisotropic elastic properties of such a composite on different length scales. Experimental studies were carried out on samples containing about 44% alumina ceramic and 56% aluminium-based alloy (Al-12Si). Ultrasonic wave velocity measurements were carried out on macroscopic poly-domain samples as well as on miniature single-domain samples. The elastic constants derived from these measurements are discussed in light of elasticity models established for lamellar and for fibrous composites. (c) 2007 Elsevier Ltd. All rights reserved.
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