论文部分内容阅读
Effects of Nd on microstructure and mechanical properties of as-cast Mg-8Li-3Al alloy were investigated by OM,X-ray diffraction(XRD),EPMA,scanning electron microscopy(SEM) and energy dispersive spectroscopy(EDS).The results showed that the dendrites sizes of α phase were decreased by the Nd addition.When the amount of addition Nd was 1.6 wt.%,the alloy with the smallest α phase was obtained.The refining mechanism mainly owed to the increasing constitutional supercooling at the solidification front.Furthermore,the compound Al 2 Nd generated by the reaction of Al and Nd,which distributed at the phase boundary and inside β phase,could also restrain the growth of α phase.Nd could improve the tensile strength and elongation of Mg-8Li-3Al alloy,however,excessive Al 2 Nd might also become crack source and decrease the elongation.
Effects of Nd on microstructure and mechanical properties of as-cast Mg-8Li-3Al alloy were investigated by OM, X-ray diffraction (XRD), EPMA, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) that the dendrites sizes of α phase were decreased by the addition of Nd. The amount of addition of Nd was 1.6 wt.%, the alloy with the smallest α phase was obtained. The refining mechanism mainly owed to the increasing constitutional supercooling at the solidification front .Furthermore, the compound Al 2 Nd generated by the reaction of Al and Nd, which distributed at the phase boundary and inside β phase, could also restrain the growth of α phase. Nd could improve the tensile strength and elongation of Mg-8Li- 3Al alloy, however, excessive Al 2 Nd might also become crack source and decrease the elongation.