Calcia-alumina fibre-reinforced Al 7075 alloy composites produced by melt-infiltration: Interfacial wetting and reaction

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Abstract

Inviscid melt-spun calcia alumina (CA) fibre-reinforced aluminium 7075 alloy matrix composites were produced at 700 and 927°C by using a melt-infiltration method. Interfacial wetting and chemical reaction of the composites were investigated by using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD). The composites processed at 700°C showed interfacial wetting and magnesium accumulation at the interfacial region. The composites processed at 927°C showed the formation of a 15 μm thick interphase region as well as excellent interfacial wetting. EDS analysis gave averaged compositions of this interface region at 63.5 at % Al and 31.5 at % Mg, which corresponds to the composition of spinel, MgAl2O4. The formation of spinel at the interface was confirmed by XRD analysis on the CA fibres separated from the composites.

Original languageEnglish
Pages (from-to)1069-1073
Number of pages5
JournalJournal of Materials Science
Volume32
Issue number4
DOIs
Publication statusPublished - 1997 Jan 1
Externally publishedYes

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ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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