Effect of Ce addition on microstructure of Mg-9Li alloy

Ce元素对Mg-9Li合金显微组织的影响(英文)

The as-cast and as-extruded Mg-9Li, Mg-9Li-0.3Ce alloys were respectively prepared through a simple alloying process and hot extrusion. The microstructures of these alloys were investigated by optical microscope （OM）, scanning electron microscope （SEM）, X-ray diffractometer （XRD） and energy dispersive spectrometer （EDS）. The results indicate that Ce addition produces a strong grain refining effect in Mg-9Li alloy. The grain size of the as-extruded alloy reduces abruptly from 88.2 μm to 10.5 μm when the addition of Ce is 0.36%. Mg12Ce is verified and exists inside the grains or at the grain boundaries, thus possibly pins up grain boundaries and restrains the grain growth.

通过合金化和热挤压制备铸态及挤压态的Mg-9Li和Mg-9Li-0.3Ce合金,通过光学显微镜和扫描电镜观察结合能谱分析以及XRD分析对这一系列合金的微观组织进行研究。结果表明:Ce的添加对Mg-9Li合金有很好的晶粒细化效果,当Ce的添加量达到0.36%时,挤压态合金的尺寸从未添加的88.2μm减小至10.5μm,Mg12Ce存在于晶粒内或晶界处,因此认为Mg12Ce可能聚集在晶界处从而阻碍晶粒的长大。