Effects of Ce addition on microstructure,castability(fluidity and hot tearing sensitivity),mechanical properties and electric conductivity of commercial purity aluminum(CP-AI) were investigated through microstructure ...Effects of Ce addition on microstructure,castability(fluidity and hot tearing sensitivity),mechanical properties and electric conductivity of commercial purity aluminum(CP-AI) were investigated through microstructure observation and performance tests.Results show that adding Ce in a CP-AI can considerably refine the grains,and has an important influence on the amount,crystallographic forms,and distribution of secondary phases.Addition of Ce also has a large impact on the fluidity and hot tearing sensitivity(HTS) of the CP-AI.With the addition of Ce from 0.1wt.%to 0.5wt.%,the fluidity of CP-AI is first increased remarkably and then decreased,and the HTS has an opposite response.The best castability of the studied alloys appears to be at 0.2wt.%-0.3wt.%Ce addition.The remarkable improvement in castability is attributed to the considerable refinement of grain structure.Ce addition can also lead to a significant rise in electric conductivity.The maximum conductivity of the as-cast CP-AI is 59.7%IACS with an addition of 0.2wt.%Ce.The T7 heat treatment can further improves the conductivity to 60.7%IACS.The Ce-induced evolution of the secondary phases is believed to be the mechanism for it.展开更多
基金This work is supported by Jiangsu Key Laboratory for Advanced Metallic Materials,China(No.BM2007204)the Fundamental Research Funds for the Central Universities,China(No.2242016k40011).
基金Project(BM2007204)supported by the Jiangsu Key Laboratory of Advanced Metallic Materials,ChinaProject(2242016K40011)supported by the Fundamental Research Funds for the Central Universities,China
基金the GM Research Foundation,China(No.GAC2094)Jiangsu Key Laboratory of Advanced Metallic Materials,China(No.BM2007204)the Fundamental Research Funds for the Central Universities,China(No.2242016K40011)。
基金supported by GM Research Foundation under contract No.GB1279-NV
文摘Effects of Ce addition on microstructure,castability(fluidity and hot tearing sensitivity),mechanical properties and electric conductivity of commercial purity aluminum(CP-AI) were investigated through microstructure observation and performance tests.Results show that adding Ce in a CP-AI can considerably refine the grains,and has an important influence on the amount,crystallographic forms,and distribution of secondary phases.Addition of Ce also has a large impact on the fluidity and hot tearing sensitivity(HTS) of the CP-AI.With the addition of Ce from 0.1wt.%to 0.5wt.%,the fluidity of CP-AI is first increased remarkably and then decreased,and the HTS has an opposite response.The best castability of the studied alloys appears to be at 0.2wt.%-0.3wt.%Ce addition.The remarkable improvement in castability is attributed to the considerable refinement of grain structure.Ce addition can also lead to a significant rise in electric conductivity.The maximum conductivity of the as-cast CP-AI is 59.7%IACS with an addition of 0.2wt.%Ce.The T7 heat treatment can further improves the conductivity to 60.7%IACS.The Ce-induced evolution of the secondary phases is believed to be the mechanism for it.
