采用粉末原位合成工艺成功制备了新型Mg-50％Al4C3-xCe (x=2％、4％、6％、8％)中间合金,并利用x射线衍射(XRD)、扫描电镜(SEM)及能谱分析(EDS)对其进行物相鉴别和形貌分析.在AZ91D镁合金中加入1.2％(Mg-50％Al4C3-xCe)中间合金可明显细化枝晶组织,枝晶形貌由六重对称的树枝状演变为花瓣状,而且晶粒尺寸明显减小.当中间合金中Ce含量为6％时,合金的平均晶粒尺寸由基体合金的360 μm降至65 μm.显微组织的细化有利于合金的强韧性能及耐腐蚀性能的明显提高.%A novel Mg-50%AI4C3-xCe (x=2%, 4%, 6%, 8%) master alloy has been successfully fabricated by powder in situ synthesis process. Phase analysis and micro-morphology are analyzed by using of X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). Addition of 1.2%( Mg-50%AI4C3-xCe) to AZ91D magnesium alloy can obviously refine the α -Mg dendrite structure, and dendritic morphology transforms from the sixfold symmetrical structure into petal-like structure, grain size can be decreased apparently. The average grain size of AZ91D alloy with 1.2%(Mg-50%AI4C3-6%Ce) decreases from 360 μm to 65 μm. Microstructure refinement of AZ91D alloy is favorable to significant improvement of strength, hardness and corrosion resistance.
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