【摘 要】
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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
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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 diffiaction (XRD),scanning electron microscopy (SEM),optical microscopy (OM),energy dispersive spectrometry (EDS),transmission electron microscopy (TEM),etc.The results showed that α-Mg and β-Li phases existed in both alloys,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.
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