Mg-6Li and Mg-6Li-1Y （wt.%） alloys were prepared using permanent model casting method, and microstructure and mechanical properties were investigated by means of X-ray diffraction （XRD）, scanning electron microsco...Mg-6Li and Mg-6Li-1Y （wt.%） alloys were prepared using permanent model casting method, and microstructure and mechanical properties were investigated by means of X-ray diffraction （XRD）, scanning electron microscopy （SEM）, optical microscopy （OM）, energy dis-persive spectrometry （EDS）, transmission electron microscopy （TEM）, etc. The results showed that α-Mg and ？-Li phases existed in both al-loys, and there was also Y-enriched phase in Mg-6Li-1Y alloy. The composition of Y-enriched phase was near to the maximal solid solubility of Y in α-Mg phase. The ultimate tensile strength and yield strength of Mg-6Li-1Y alloy were improved to 112 and 107 MPa, respectively. The elongation of Mg-6Li-1Y alloy was greatly enhanced to 32% at room temperature, which was about eight times as great as that of Mg-6Li alloy. The strengthening effects of Mg-6Li-1Y alloy were attributed to the solid solution effect and precipitates both introduced by Y.展开更多
基金supported by the National Natural Science Foundation of China for Creative Research Group (20921002)the Foundation for Science Program of Changchun City (08YJ09)
文摘Mg-6Li and Mg-6Li-1Y （wt.%） alloys were prepared using permanent model casting method, and microstructure and mechanical properties were investigated by means of X-ray diffraction （XRD）, scanning electron microscopy （SEM）, optical microscopy （OM）, energy dis-persive spectrometry （EDS）, transmission electron microscopy （TEM）, etc. The results showed that α-Mg and ？-Li phases existed in both al-loys, and there was also Y-enriched phase in Mg-6Li-1Y alloy. The composition of Y-enriched phase was near to the maximal solid solubility of Y in α-Mg phase. The ultimate tensile strength and yield strength of Mg-6Li-1Y alloy were improved to 112 and 107 MPa, respectively. The elongation of Mg-6Li-1Y alloy was greatly enhanced to 32% at room temperature, which was about eight times as great as that of Mg-6Li alloy. The strengthening effects of Mg-6Li-1Y alloy were attributed to the solid solution effect and precipitates both introduced by Y.
