Compression behaviour of magnesium-eutectic mixture layered composite
Andrzej Dziadoń, Renata Mola Politechnika Świętokrzyska, Katedra Metaloznawstwa i Technologii Materiałowych, al. 1000-lecia PP 7, 25-314 Kielce, Poland
Quarterly No. 4, 2008 pages 364-368
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abstract Magnesium-eutectic mixture (Mg17Al12 and solid solution of aluminium in magnesium) layered composite has been prepared by sintering magnesium and aluminium sheets. Samples of the composite with different thickness ratio of the magnesium layers to the layers containing eutectic mixture were examined in the compression test. Experiment was performed to compare the strain behaviour and strength properties of composites loaded parallel or perpendicular to the layers. According to microscopic observations in both cases crack initiation occurred in the layers of eutectic mixture. Cracks were spreading along or across the layers depending on the load direction. The composites loaded parallel to layers exhibit extremely low plasticity because with cracking of layers containing eutectic mixture, catastrophic fracture of specimen was observed. Composites compressing perpendicular to layers show some plastic flow to failure despite splitting of the eutectic mixture layers. In this case cracks of layers containing eutectic mixture were arrested at the magnesium. With increase of thickness ratio layers containing eutectic mixture to layers of magnesium increases the yield strength of composites. During compression test delamination of the layers of composite was not observed. Keywords: metal-intermetallic layered composite, magnesium, compression test