Acoustic emission from particulate-reinforced metal matrix composites
- Univ. of Oxford (United Kingdom). Dept. of Materials
A systematic study of the effect of microstructural parameters on the fracture behavior 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 emissions 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 reinforcing 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.
- OSTI ID:
- 6185140
- Journal Information:
- Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 41:5; ISSN 0956-7151; ISSN AMATEB
- Country of Publication:
- United States
- Language:
- English
Similar Records
The effect of particulate fracture in determining fracture toughness of metal matrix composites
The effect of particulate fracture in determining fracture toughness of metal matrix composites
Related Subjects
360602 -- Other Materials-- Structure & Phase Studies
360603* -- Materials-- Properties
ALLOYS
ALUMINIUM ALLOYS
CARBIDES
CARBON COMPOUNDS
COMPOSITE MATERIALS
DUCTILITY
FRACTURE PROPERTIES
MATERIALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
REINFORCED MATERIALS
SILICON CARBIDES
SILICON COMPOUNDS
STRAINS
TENSILE PROPERTIES