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Abstract: Addition of Al can lead to the invalidation of KBF4 modification on the primary Mg2Si in Mg–5Si alloys and thus promote the preferred growth of the primary Mg2Si dendrite crystal. This may be due to the decrease or exhaustion of B in the melts by the formation of AlB x . [Copyright &y& Elsevier]

The effect of Al content on the self-propagating high-temperature synthesis (SHS) reaction of the Al–Ti–C preform in molten magnesium was investigated. As the Al content in the preforms was increased over the range of 20–40 wt.%, the TiC particulate sizes decreased from ∼5.0 to ∼1.0 μm. Microstructural characterization of the TiC/Mg (AZ91D) composite showed relatively uniform distribution of TiC particulates in the matrix material and the presence of minimal micro-porosity. [Copyright &y& Elsevier]