Abstract
Recently, Mg-Zn-Y alloy containing icosahedral quasicrystalline (I-phase) has attracted significant interest because it has enhanced strength and ductility at ambient temperature and at elevated temperature. However, the thermal stable I-phase with chemical composition of Mg3YZn6was formed as a coarse eutectic pocket structure in the α-Mg matrix during conventional solidification in Mg-Zn-Y alloy system. The influence of AlTiC master alloy on the morphology and amounts of I-phase in Mg-Zn-Y alloy have been investigated in this study. The microstructure and constituent phases are characterized from optical microscope (OM), X-ray diffraction (XRD) and field emission gun scanning electron microscopy (FEG-SEM). It is found that the addition of AlTiC master alloy not only can change the morphology of the I-phase, but also can increase the amount of the I-phase. The formation and growth mechanism of the I-phase have been discussed. On the other hand, the grains are also refined. It may be attributed to the combined effect of TiC and Al4C3particles, because TiC and Al4C3particles can act as heterogeneous nucleation cores of α-Mg grains. The effect of AlTiC master alloy on the ultimate tensile strength (UTS) and the elongation to failure (EL) is also discussed.
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