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运用金相显微镜、电子探针和X ray等手段分析了AZ61合金添加稀土元素Ce后铸态显微结构的变化。结果表明 ,Ce的加入细化了 β相和晶粒 ,并减少了 β相的量。Ce在AZ61合金中以呈块状和杆状Al4 Ce化合物的形式存在 ,这两种化合物熔点极高 ,几乎不溶于基体 ,有极少部分偏聚在晶界上。固溶处理后 ,AZ61合金中的 β (Mg12Al17)相几乎全部溶入基体 ;而加入稀土Ce后 ,AZ61合金中的Al4 Ce化合物几乎很少溶入基体。Ce的加入能够提高AZ61合金基体相的显微硬度 ,但幅度不大 ;而将其固溶处理后 ,Ce显著提高了AZ61合金的显微硬度。
The microstructure of the as-cast AZ61 alloy was analyzed by means of optical microscope, electron probe and X-ray diffraction. The results show that the addition of Ce refines the β phase and the grains and reduces the amount of β phase. Ce is present in the form of massive and rod-shaped Al 4 Ce compounds in the AZ61 alloy. These two compounds have very high melting points and hardly dissolve in the matrix, with very little segregation on the grain boundaries. After solution treatment, the β (Mg12Al17) phase in AZ61 alloy almost completely dissolves into the matrix. However, Al 4 Ce compound in AZ61 alloy hardly dissolves into the matrix after adding rare earth Ce. Ce addition can improve the microhardness of AZ61 alloy matrix phase, but the magnitude is not large; and its solution treatment, Ce significantly increased the microhardness of AZ61 alloy.