首页|Influence of cerium and yttrium addition on strength and electrical conductivity of pure aluminum alloys

Influence of cerium and yttrium addition on strength and electrical conductivity of pure aluminum alloys

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To develop pure aluminum alloys with high conductivity and strength,Al-0.2Ce and Al-0.2Ce-0.1Y alloys were prepared by rolling and annealing processes in this study.The effects of trace rare earth elements on the strength and electrical conductivity of the pure aluminum alloys were investigated.It is revealed that the addition of Ce and Y to pure aluminum can effectively enhance the strength and electrical conductivity of the alloys.In Al-0.2Ce,the addition of Ce can effectively refine the grain size of α-Al,with an average grain size of 90.68 μm in the as-cast state.The grain size of the alloy is further reduced to 87.55 μm by the simultaneous addition of Y.The synergistic addition of Ce and Y changes the properties of the alloy.The addition of Ce and Y also produces the Al11Ce3 and Al3Y second phases,which have coherent relationship with α-Al.The two-dimensional mismatch degree was calculated to be only 4.43％and 0.85％,respectively,which can provide a certain amount of nucleation substrate for α-Al in the in-cubation stage.The interfacial match between the L12 structure of Al3Y and α-Al was calculated using first-principles simulations.The results indicate that Al3Y has a strong bonding effect with α-Al.Nano-scale second phases at grain boundaries can be effective in reducing resistivity due to dislocation motion.Nanoscale second phases with better matching interfaces to the substrate have no positive effect on the scattering motion of electrons.

Pure aluminumRare earthsImpurity purificationFirst-principles calculationsStrength-conductivity contradiction

Guojian Lin、Lu Li、Zhengwei Guo、Xianjun Jia、Xiao Wang、Zhentao Yuan、Guoxing Zhang、Yun Zhan、Quan Shan、Zulai Li

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Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming,650093,China

Research Center for Analysis and Measurement,Kunming University of Science and Technology,Kunming,650093,China

City College,Kunming University of Science and Technology,Kunming,650051,China

Major Science and Technology Projects in Yunnan ProvinceCentral Governmentled Local Science and Technology Development ProjectYunnan Applied Basic Research ProjectYunnan Key Research and Development ProgramNational and Local Joint Engineering Laboratory of Advanced Metal Solidification Forming and Equipment TechnologyAnalytic and Testing Research Centre of Yunnan,Kunming University of Science and Technology,Kunming,China

202202AG050011202207AB110003202101AT070123202103AF140004

2024

10.1016/j.jre.2023.09.019

稀土学报(英文版)
中国稀土学会

稀土学报(英文版)

CSTPCDEI
影响因子：1.3
ISSN：1002-0721
年,卷(期)：2024.42(3)
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