The uniformity of the flow structure of the extruded copper bars has a significant impact on the mechanical and electrical conductivity properties of the material.A finite element simulation was conducted on the conti...The uniformity of the flow structure of the extruded copper bars has a significant impact on the mechanical and electrical conductivity properties of the material.A finite element simulation was conducted on the continuous equal-channel angular extrusion(C-ECAP)-extended extrusion process of pure copper.The material rheology during the deformation process was studied through experiments,and the variation laws of strain hardening and mechanical anisotropy were analyzed.The results show that the ultra-fine grain structure formed by C-ECAP can effectively suppress the turbulence of the material in the expansion zone and form a polycrystalline structure in the retarding zone.The texture type in the expansion zone is mainly{110}<112>brass texture and{110}<110>Goss texture;annealing twins and{001}<100>cubic weaves appear in the central region;and{110}<100>Goss texture and{110}<111>texture appear in the extrusion region.After deformation,the grain size of the copper bars gradually increases from the center to the periphery,the hardness of the copper busbar decreases first and then slowly increases along the extrusion direction,and the electrical conductivity continues to increase.The texture features,strain state,and expansion chamber structure are the main reasons for the non-uniform flow and anisotropy of the material.展开更多
基金supported by Gansu Provincial Department of Education Industrial Support Program Project(Grant No.2025CYZC‐069)Central Government‐guided Local Science and Technology Development Fund Project(Grant No.25ZYJE002)National Natural Science Foundation of China(Grant Nos.51861022 and 51261016).
文摘The uniformity of the flow structure of the extruded copper bars has a significant impact on the mechanical and electrical conductivity properties of the material.A finite element simulation was conducted on the continuous equal-channel angular extrusion(C-ECAP)-extended extrusion process of pure copper.The material rheology during the deformation process was studied through experiments,and the variation laws of strain hardening and mechanical anisotropy were analyzed.The results show that the ultra-fine grain structure formed by C-ECAP can effectively suppress the turbulence of the material in the expansion zone and form a polycrystalline structure in the retarding zone.The texture type in the expansion zone is mainly{110}<112>brass texture and{110}<110>Goss texture;annealing twins and{001}<100>cubic weaves appear in the central region;and{110}<100>Goss texture and{110}<111>texture appear in the extrusion region.After deformation,the grain size of the copper bars gradually increases from the center to the periphery,the hardness of the copper busbar decreases first and then slowly increases along the extrusion direction,and the electrical conductivity continues to increase.The texture features,strain state,and expansion chamber structure are the main reasons for the non-uniform flow and anisotropy of the material.
