Acoustic emission from particulate-reinforced metal matrix composites

A systematic study of the effect of microstructural parameters on the fracture behaviour of silicon carbide particle reinforced aluminium matrix composites has been carried out. Acoustic emissions have been monitored during tensile testing, giving the size and number of emmissions as a function of s...

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Bibliographic Details
Published in:Acta metallurgica et materialia 1993-05, Vol.41 (5), p.1431-1445
Main Authors: Mummery, P.M., Derby, B., Scruby, C.B.
Format: Article
Language:English
Subjects:
360602 - Other Materials- Structure & Phase Studies
360603 - Materials- Properties
ALLOYS
ALUMINIUM ALLOYS
Applied sciences
CARBIDES
CARBON COMPOUNDS
COMPOSITE MATERIALS
DUCTILITY
Exact sciences and technology
FRACTURE PROPERTIES
Fractures
MATERIALS
MATERIALS SCIENCE
MECHANICAL PROPERTIES
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
MICROSTRUCTURE
REINFORCED MATERIALS
SILICON CARBIDES
SILICON COMPOUNDS
STRAINS
TENSILE PROPERTIES
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Summary:A systematic study of the effect of microstructural parameters on the fracture behaviour of silicon carbide particle reinforced aluminium matrix composites has been carried out. Acoustic emissions have been monitored during tensile testing, giving the size and number of emmissions as a function of strain. This has been shown to be simply related to the rate of void nucleation at the reinforcing phase. Both particle fracture and particle/matrix decohesion mechanisms can be detected. Void nucleation was observed from the onset of plastic deformation and a linear relationship between damage initiation rate and strain was found. The rate of emission increased with reiforcing particle size and volume fraction but was independent of matrix alloy composition and heat treatment. These results show that the failure strain of particulate metal matrix composites is not controlled solely by the onset of void nucleation at the reinforcing phase. Local failure processes in the matrix are shown to promote void coalescence and dominate the ductility. However, suppression of void nucleation at the particles increases the ductility. It is suggested that a critical number of fractured particles is required before failure.
ISSN:0956-7151
1873-2879
DOI:10.1016/0956-7151(93)90252-N