Fracture toughness of microsphere Al2O3–Al particulate metal matrix composites |
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| Authors: | BG Park AG Crosky AK Hellier |
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| Affiliation: | aNational Research Laboratory, School of Materials Science and Engineering, Pusan National University, San 30, Jangjeon-dong, Keumjung-gu, Busan 609-735, Republic of Korea;bSchool of Materials Science and Engineering, The University of New South Wales, Sydney, NSW 2052, Australia;cInstitute of Materials Engineering, Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai, NSW 2234, Australia |
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| Abstract: | The fracture toughness and behaviour of COMRAL-85TM, a 6061 aluminium–magnesium–silicon alloy reinforced with 20 vol% Al2O3-based polycrystalline ceramic microspheres, and manufactured by a liquid metallurgy route, have been investigated. Fracture toughness tests were performed using short rod and short bar (chevron-notch) specimens machined from extruded 19 mm diameter rod, heat treated to the T6 condition. The fracture toughness in the R–L orientation was found to be lower than in the C–R or L–R orientations owing to the presence of particle-free bands in the extrusion direction. Short rod tests were also conducted for the R–L orientation on six powder metallurgy composites with particle volume fractions ranging between 5% and 30%. It was found that the fracture toughness decreased progressively with particle volume fraction, but at a decreasing rate. A detailed examination of the fracture behaviour was made for both the liquid metallurgy and powder metallurgy processed composites. |
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| Keywords: | A Metal matrix composites (MMCs) Particle-reinforcement B Fracture toughness D Fractography |
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