用放射性同位素~(141)Ce及有机电解液低温电解法测定Ce在工业纯铝(A_1级)中的合金化量,并用电子探针,涂敷法自射线照相及自射线照相-扫描电镜法研究Ce在Al中的分布.实验结果表明,Al中的大部分Ce以合金化状态存在.Al中的Ce促使Si更多地富集于晶界.随着Ce含量的增加,Al中出现CeAl_4及Ce_5Si_3化合物,并在晶界出现共晶网组织.在退火与不退火的铸态铝中Ce在晶界与枝晶界有较明显的富集.
The alloyed amount of Ce in aluminum of commercial purity has been deter-mined by using radioactive isotope ~(14)Ce and by the method of low tempera-ture electrolysis in organic electrolyte.The distribution of alloying Ce in the Alhas also been detected by means of EPMA,autoradiography and autoradiographySEM.Results showed that the most of Ce in Al is in an alloying state and im-pels the enrichment of Si along grain boundaries.The compounds of CeAl_4 andCe_5Si_3 in the Al as well as the eutectic network structure at grain boundary arefound with the increasing of the amount of Ce contained.The Ce is obviouslyenriched itself along the grain and dendrite boundaries in the as-cast Al withor without annealing.
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