Impact of Thermal Effects on Properties of Carbon-Magnesium Composites

Chernishova, T. A.; Kobeleva, L. I.; Tregubova, I. E.; Eremenko, V. I.

doi:10.1007/978-94-011-3676-1_74

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“…The two possible magnesium carbides-MgC 2 and Mg 2 C 3 -are highly reactive and thermally unstable. 13,14 The carbide MgC 2 has been reported in a carbon-fibre-reinforced pure Mg composite 15 but this has been questioned by Viala et al, 4 who report that carbon fibres exhibit an almost complete inertness to pure Mg between 700 and 1000 K.…”

Section: Introductionmentioning

confidence: 98%

Microstructural analysis of a carbon fibre reinforced AZ91D magnesium alloy composite

Russell-Stevens

Todd

Papakyriacou³

2005

Surface & Interface Analysis

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Interfacial regions in metal matrix composites are important in controlling the mechanical and thermal properties of these materials. An ultrahigh modulus fibre-reinforced magnesium alloy matrix composite has been studied, with particular attention paid to the interfacial and precipitate microstructures. Fibres were surface treated but uncoated prior to composite manufacture. Observations revealed that an interface consisting of polycrystalline magnesium oxide with occasional Mg 17 Al 12 (b) precipitate particles predominates. Discontinuous b particles formed at fibre surfaces, and continuous spherical and lamellar b precipitates nucleated at grain boundaries and fibre surfaces. High dislocation densities exist at the interface indicating matrix-yielding subsequent to manufacture and that a high mean residual compressive stress acts on fibres. The effect that the observed microstructural features has on composite properties and on interfacial bonding is discussed and compared to examples in the literature.

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