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Microstructural analysis of a carbon fibre reinforced AZ91D magnesium alloy composite
Author(s) -
RussellStevens M.,
Todd R.,
Papakyriacou M.
Publication year - 2005
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.2026
Subject(s) - materials science , composite number , composite material , magnesium , microstructure , lamellar structure , magnesium alloy , alloy , metal matrix composite , crystallite , modulus , dislocation , metallurgy
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 (β) precipitate particles predominates. Discontinuous β particles formed at fibre surfaces, and continuous spherical and lamellar β 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. Copyright © 2005 John Wiley & Sons, Ltd.