Mechanical properties of QE22 magnesium alloy based composites
Zdeněk Drozd, Zuzanka Trojanová, Aleš Jäger Charles University, Faculty of Mathematics and Physics, Ke Karlovu 3 (5), 121 16 Prague 2
Annals 4 No. 10, 2004 pages 137-142
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abstract Mechanical properties of two magnesium alloy based composites were studied. Composite with QE22 matrix reinforced by 20 vol.% of Al2O3 short fibres and hybrid composite (QE22 + 5 vol.% Al2O3 fibres and 15 vol.% SiC particles) were deformed in compression at temperatures from RT up to 400°C. Two types of specimens were investigated - one with fibres plane oriented parallel to the stress axis and the other with perpendicular fibres plane orientation. Temperature dependencies of the characteristic stresses σ 02 and σ max were studied. Mechanical properties of composite materials were compared with the monolithic QE22 matrix alloy. Optical and scanning electron microscopy were used for study of microstructure of materials. Possible hardening and softening mechanisms are discussed. Key words: composite, hybrid composite, hardening, softening