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

作     者：Guojian Lin Lu Li Zhengwei Guo Xianjun Jia Xiao Wang Zhentao Yuan Guoxing Zhang Yun Zhan Quan Shan Zulai Li Guojian Lin;Lu Li;Zhengwei Guo;Xianjun Jia;Xiao Wang;Zhentao Yuan;Guoxing Zhang;Yun Zhan;Quan Shan;Zulai Li

作者机构：Faculty of Materials Science and EngineeringKunming University of Science and TechnologyKunming650093China Research Center for Analysis and MeasurementKunming University of Science and TechnologyKunming650093China City CollegeKunming University of Science and TechnologyKunming650051China 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2024年第42卷第3期

页      面：600-611,I0006页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：Project supported by the Major Science and Technology Projects in Yunnan Province(202202AG050011) Central Government-led Local Science and Technology Development Project(202207AB110003) Yunnan Applied Basic Research Project(202101AT070123) Yunnan Key Research and Development Program(202103AF140004) 

主　　题：Pure aluminum Rare earths Impurity purification First-principles calculations Strength-conductivity contradiction 

摘      要：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 a-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 Al_(11)Ce_(3) and Al_(3)Y second phases, which have coherent relationship with a-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 a-Al in the incubation stage. The interfacial match between the L1_(2)structure of Al_(3)Y and a-Al was calculated using first-principles simulations. The results indicate that Al_(3)Y has a strong bonding effect with a-Al. Nanoscale second phases at grain boundaries can be effective in reducing resistivity due to dislocation *** second phases with better matching interfaces to the substrate have no positive effect on the scattering motion of electrons.