Fibre-matrix interactions during fabrication of Al2O3Mg metal matrix composites

B. Hallstedt, Z. K. Liu, J. Ågren

Research output: Contribution to journalArticle

65 Citations (Scopus)

Abstract

The reactions between alumina fibres and magnesium matrix in metal matrix composites at 1000 K are investigated theoretically and experimentally. The diffusivities of aluminium in layers of spinel and magnesia are estimated and found to be exceedingly low. It is thus concluded that diffusional growth of such layers in the boundary between matrix and fibres will not occur during the casting of the composite. The reaction between amorphous SiO2 binder and magnesium is further discussed and it is concluded that this may proceed at a considerable rate. Composites cast by means of liquid infiltration are studied metallographically by optical microscopy, scanning electron microscopy and transmission electron microscopy/scanning transmission electron microscopy equipped for microanalysis. The observations are in general agreement with the theoretical results, indicating that the reaction between binder and liquid magnesium is the only important one during fabrication of the composite. It is found that the binder transforms almost completely to a very-fine-grained magnesia and that silicon is dissolved in the molten matrix and precipitated as Mg2Si upon cooling.

Original languageEnglish (US)
Pages (from-to)135-145
Number of pages11
JournalMaterials Science and Engineering A
Volume129
Issue number1
DOIs
StatePublished - Oct 1990

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metal matrix composites
magnesium
Metals
Magnesium Oxide
Magnesium
Binders
Fabrication
fabrication
composite materials
fibers
Fibers
Magnesia
Composite materials
matrices
transmission electron microscopy
scanning electron microscopy
interactions
infiltration
liquids
Transmission electron microscopy

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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title = "Fibre-matrix interactions during fabrication of Al2O3Mg metal matrix composites",
abstract = "The reactions between alumina fibres and magnesium matrix in metal matrix composites at 1000 K are investigated theoretically and experimentally. The diffusivities of aluminium in layers of spinel and magnesia are estimated and found to be exceedingly low. It is thus concluded that diffusional growth of such layers in the boundary between matrix and fibres will not occur during the casting of the composite. The reaction between amorphous SiO2 binder and magnesium is further discussed and it is concluded that this may proceed at a considerable rate. Composites cast by means of liquid infiltration are studied metallographically by optical microscopy, scanning electron microscopy and transmission electron microscopy/scanning transmission electron microscopy equipped for microanalysis. The observations are in general agreement with the theoretical results, indicating that the reaction between binder and liquid magnesium is the only important one during fabrication of the composite. It is found that the binder transforms almost completely to a very-fine-grained magnesia and that silicon is dissolved in the molten matrix and precipitated as Mg2Si upon cooling.",
author = "B. Hallstedt and Liu, {Z. K.} and J. {\AA}gren",
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}

Fibre-matrix interactions during fabrication of Al2O3Mg metal matrix composites. / Hallstedt, B.; Liu, Z. K.; Ågren, J.

In: Materials Science and Engineering A, Vol. 129, No. 1, 10.1990, p. 135-145.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Fibre-matrix interactions during fabrication of Al2O3Mg metal matrix composites

AU - Hallstedt, B.

AU - Liu, Z. K.

AU - Ågren, J.

PY - 1990/10

Y1 - 1990/10

N2 - The reactions between alumina fibres and magnesium matrix in metal matrix composites at 1000 K are investigated theoretically and experimentally. The diffusivities of aluminium in layers of spinel and magnesia are estimated and found to be exceedingly low. It is thus concluded that diffusional growth of such layers in the boundary between matrix and fibres will not occur during the casting of the composite. The reaction between amorphous SiO2 binder and magnesium is further discussed and it is concluded that this may proceed at a considerable rate. Composites cast by means of liquid infiltration are studied metallographically by optical microscopy, scanning electron microscopy and transmission electron microscopy/scanning transmission electron microscopy equipped for microanalysis. The observations are in general agreement with the theoretical results, indicating that the reaction between binder and liquid magnesium is the only important one during fabrication of the composite. It is found that the binder transforms almost completely to a very-fine-grained magnesia and that silicon is dissolved in the molten matrix and precipitated as Mg2Si upon cooling.

AB - The reactions between alumina fibres and magnesium matrix in metal matrix composites at 1000 K are investigated theoretically and experimentally. The diffusivities of aluminium in layers of spinel and magnesia are estimated and found to be exceedingly low. It is thus concluded that diffusional growth of such layers in the boundary between matrix and fibres will not occur during the casting of the composite. The reaction between amorphous SiO2 binder and magnesium is further discussed and it is concluded that this may proceed at a considerable rate. Composites cast by means of liquid infiltration are studied metallographically by optical microscopy, scanning electron microscopy and transmission electron microscopy/scanning transmission electron microscopy equipped for microanalysis. The observations are in general agreement with the theoretical results, indicating that the reaction between binder and liquid magnesium is the only important one during fabrication of the composite. It is found that the binder transforms almost completely to a very-fine-grained magnesia and that silicon is dissolved in the molten matrix and precipitated as Mg2Si upon cooling.

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