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Fracture toughness of microsphere Al2O3-Al particulate metal matrix composites

Journal Article


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. © 2008 Elsevier Ltd. All rights reserved.

Publication Date


  • 2008

Citation


  • Park, B. G., Crosky, A. G., & Hellier, A. K. (2008). Fracture toughness of microsphere Al2O3-Al particulate metal matrix composites. Composites Part B: Engineering, 39(7-8), 1270-1279. doi:10.1016/j.compositesb.2008.01.005

Scopus Eid


  • 2-s2.0-49849089855

Start Page


  • 1270

End Page


  • 1279

Volume


  • 39

Issue


  • 7-8

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. © 2008 Elsevier Ltd. All rights reserved.

Publication Date


  • 2008

Citation


  • Park, B. G., Crosky, A. G., & Hellier, A. K. (2008). Fracture toughness of microsphere Al2O3-Al particulate metal matrix composites. Composites Part B: Engineering, 39(7-8), 1270-1279. doi:10.1016/j.compositesb.2008.01.005

Scopus Eid


  • 2-s2.0-49849089855

Start Page


  • 1270

End Page


  • 1279

Volume


  • 39

Issue


  • 7-8