Effects of Nd on microstructure and mechanical properties of as-cast Mg-8Li-3Al alloy |
| |
Authors: | LIMing HAO Hai ZHANG Aimin SONG Yingde ZHANG Xingguo |
| |
Affiliation: | School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China |
| |
Abstract: | 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. |
| |
Keywords: | Mg-Li-Al alloy Nd grain refinement microstructure mechanical properties rare earths |
本文献已被 CNKI 维普 ScienceDirect 等数据库收录! |
|