The interface microstructure
in alumina (FP) fibre/magnesium alloy composite M.Pfeifer, J.M. Rigsbee, K.K. Chawla
Journal of Materials Science, Volume 25, 1990, pages 1563 - 1567.
Abstract
The objective of the work was to characterize the interfacial reaction zone in the metal matrix composite system α-Al2O3 (FP)/Mg (ZE41A). The composite was fabricated by a liquid infiltration method. The reaction zone, a result of the reaction between magnesium in the alloy and the alumina fibres, was analysed for its morphology, chemistry, and crystallographic orientation using transmission electron microscopy. The results showed the reaction zone to be, on average, 100 nm wide and composed of MgO. The grains of the reaction zone ranged from less than 10 nm at the fibre/reaction zone interface to greater than 100 nm at the matrix/reaction zone interface. It is proposed that the growth of the reaction zone was controlled by a `seepage' mechanism involving infiltration of liquid magnesium between MgO crystals.
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