Effect of Rare Earth Ce and Y on Microstructure and Electrical Conductivity of Cu-0.8Cr-0.2Zr Alloy AITranslate

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Chinese Library Classification Number:TG146.11[一般工业技术]

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To enhance the mechanical properties and electrical conductivity of Cu-Cr-Zr alloys and meet the requirements of new infrastructure for materials,this paper investigated the effects of single rare earth Ce,Y content and the mass ratio of mixed rare earth Ce/Y on the microstructure,mechanical properties,elec-trical conductivity and phase composition of Cu-0.8Cr-0.2Zr alloy.The results show that when single rare earth is added,with the increase in the content of rare earth Ce or Y,the microstructure of as-cast alloy first refines and then coarsens,and the hardness and electrical conductivity first increase and then decrease,with Y having a better effect than Ce on refining the microstructure and improving the hardness and elec-trical conductivity of the alloy.After adding mixed rare earth,the refinement effect of as-cast alloy micro-structure is better than that of adding single rare earth,but the hardness and electrical conductivity are lower than those of single rare earth alloy.The electrical conductivity of the alloy is higher when the Ce/Y mass ratio is higher,and the microstructure refinement effect and hardness of the alloy are better when the Ce/Y mass ratio is lower.Compared with as-cast alloy,rolling heat treatment further improves the micro-structure refinement,electrical conductivity and mechanical properties of the alloy.After rolling heat treat-ment,the alloy containing 0.5% Y has the best hardness and tensile strength,which are 132.38 HV and 485.33 MPa,respectively.The alloy containing 0.25% Ce and 0.25% Y has the best electrical conductivi-ty,which is 81.08% IACS.This study is beneficial for promoting the efficient and balanced utilization of Bayan Obo minerals and provides ideas for the industrial production and performance optimization of Cu-Cr-Zr alloy.