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论文类型： 期刊论文

发表时间： 2012-05-01

发表刊物： JOURNAL OF RARE EARTHS

收录刊物： SCIE、EI、ISTIC

卷号： 30

期号： 5

页面范围： 492-496

ISSN号： 1002-0721

关键字： Mg-Li-Al alloy; Nd; grain refinement; microstructure; mechanical properties; rare earths

摘要： 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 alpha phase were decreased by the Nd addition. When the amount of addition Nd was 1.6 wt.%, the alloy with the smallest alpha phase was obtained. The refining mechanism mainly owed to the increasing constitutional supercooling at the solidification front. Furthermore, the compound Al2Nd generated by the reaction of Al and Nd, which distributed at the phase boundary and inside beta phase, could also restrain the growth of alpha phase. Nd could improve the tensile strength and elongation of Mg-8Li-3Al alloy, however, excessive Al2Nd might also become crack source and decrease the elongation.