The fabrication of magnesium alloy metal-matrix composites (MMCs) and the mechanical properties of the sandwich
formed with this material were investigated. Magnesium alloy composites containing various volume percentage of 0.99,
2.91, 4.76 and 9.09 % silicon-carbide (SiC) particles were prepared by molten metal mixing and machined as the
faceplate of the sandwich. The particle had been dispersed by the injecting of the argon gas from a stainless pipe. Optical
microscopic examination, hardness and tensile test were carried out. The sandwich was combined by the hot press
method and studied by bending test. It is observed that the hardness of MMCs increases, but its strength decreases with
increasing volume percentage of silicon-carbide particle, according to the results of hardness and bending test. It can be
found that the specific strength and specific bending strength of sandwich composites fabricated with the faceplates of
magnesium alloy added SiC reinforcements are a little higher than that sandwich with the aluminum alloy faceplates, but
less than that of sandwich with magnesium alloy.
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