Abstract
Recently published research works showed that the mechanical properties of particulate reinforced metal matrix composites (MMC`s) are strongly affected by damage. It is accepted that such development of microstructural deterioration is related to reinforcement integrity (i.e. particulate cracking or matrix/reinforcement interface debonding) and that it takes place well before the final material collapse. Damage in composites can be measured by metallographic observations or by indirect methods such as by monitoring the elastic modulus changes as affected by the strain experienced. For monolithic metallic alloys, acoustic emission (AE) techniques are a useful tool for the detailed analysis of damage mechanisms and of their evolution during tensile and fatigue testing. The present paper is concerned with microstructural damage that occurs during tensile testing of MMC`s. Damage progression during loading was measured by acoustic emission technique on a Al{sub 2}O{sub 3}-Al particulate composite and on the corresponding unreinforced alloy considered for comparison purposes.
Published Version
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