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Effects of heat treatment on the mechanical properties of SiCp/6061 Al composite

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Abstract

Metal-matrix composites have been receiving considerable attention as light-weight materials for use in many advanced technology applications. Silicon carbide (SiC) particles and whiskers have several advantages over other discontinuous reinforcements. Studies have shown that heat treatment can change the mechanical properties of metal-matrix composites.

Modified heat treatments were developed for SiCp/6061 Al composites through a series of heat treatment with varied solution temperatures and aging time. Mechanical tests were conducted to determine the mechanical properties of the composites in three conditions; as-received, annealed, and heat treated. The modified heat treatments resulted in increases in the yield strength of up to 12% over the manufacturer’s reported yield strength for the standard T6 heat treatment. The trends which occur during heat treatment of SiCp/6061 Al are simular to those which occur during heat treatment of aluminum alloys. In addition, the relationship between the mechanical properties and the heat treatment parameters was documented. Throughout this study, the values of elastic modules were rather erratic compared to the strength values. Scanning Electron Microscope fractographic analysis revealed various fracture initiation sites, such as particle clusters and iron inclusions.

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Aldun, D., Martin, P. & Sun, J. Effects of heat treatment on the mechanical properties of SiCp/6061 Al composite. JMEP 1, 615–624 (1992). https://doi.org/10.1007/BF02649243

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Keywords

  • Aging Time
  • Solution Temperature
  • Aluminum Composite
  • Composite Sheet
  • Standard Heat Treatment