Mg-5Li-xSn （x=0.15, 0.25 and 0.65, mass fraction） alloys were prepared. The microstructures of these alloys were investigated through optical microscope （OM）, scanning electron microscope （SEM）, X-ray diffractom...Mg-5Li-xSn （x=0.15, 0.25 and 0.65, mass fraction） alloys were prepared. The microstructures of these alloys were investigated through optical microscope （OM）, scanning electron microscope （SEM）, X-ray diffractometer （XRD） and energy dispersive spectrometer （EDS）. The results indicate that Sn additions produce a strong grain refinement effect on Mg-5Li alloy. The mean grain size of as-cast Mg-Li alloys with Sn is reduced remarkably from 556 μm to 345 μm, and that of the as-extruded alloys is reduced from 33 μm to 23 μm when the Sn content increases from 0.15% to 0.65%. The near net-like Mg2Sn phase in the as-cast alloys is verified at the grain boundaries. After extrusion, the granular Mg2Sn phase mainly exists inside the grains and thus can act as nucleation sites of α-Mg grains during the dynamic recrystallization and make the microstructure finer.展开更多
基金Projects (51171212, 50725413) supported by the National Natural Science Foundation of ChinaProject (2007CB613706) supported by the National Basic Research Program of China+1 种基金Project (2009AA03Z507) supported by the National High-tech Research Program of ChinaProjects (2010CSTC-BJLKR, CSTC2010AA4048) supported by Chongqing Science and Technology Commission, China
文摘Mg-5Li-xSn （x=0.15, 0.25 and 0.65, mass fraction） alloys were prepared. The microstructures of these alloys were investigated through optical microscope （OM）, scanning electron microscope （SEM）, X-ray diffractometer （XRD） and energy dispersive spectrometer （EDS）. The results indicate that Sn additions produce a strong grain refinement effect on Mg-5Li alloy. The mean grain size of as-cast Mg-Li alloys with Sn is reduced remarkably from 556 μm to 345 μm, and that of the as-extruded alloys is reduced from 33 μm to 23 μm when the Sn content increases from 0.15% to 0.65%. The near net-like Mg2Sn phase in the as-cast alloys is verified at the grain boundaries. After extrusion, the granular Mg2Sn phase mainly exists inside the grains and thus can act as nucleation sites of α-Mg grains during the dynamic recrystallization and make the microstructure finer.
