剧烈塑性变形制备高强度高导电纯铜的研究

研究了纯铜多道次反复镦压剧烈塑性变形后的组织、力学性能及导电性能。结果表明,通过反复镦压能在保持试样原始形状和尺寸的情况下在材料内部累积很大的应变,实现材料组织的超细化,退火纯铜经B路线15道次反复镦压变形后,晶粒细化至亚微米级。随镦压次数的增加,纯铜的硬度和抗拉强度明显提高,抗拉强度达到459.1MPa,伸长率明显下降,但仍在20%以上。纯铜的导电率随镦压次数的增加而下降,但15道次镦压后仍然保持在91.7%IACS,说明反复镦压剧烈塑性变形工艺可以制备出具有高强度和良好导电性的块体纯铜材料。

Investigation of High Tensile Strength and High Electrical Conductivity Pure Copper Fabricated by Severe Plastic Deformation

Microstructure,mechanical property and electrical conductivity of pure copper fabricated by CCDC were investigated.The results show that large strain can be accumulated without changing the shape and dimension of the sample by CCDC,which leads to the grain refinement.The grain size is refined to submicrometer level after 15 passes CCDC through route B.The hardness and tensile strength improve obviously with increasing the number of CCDC.The tensile strength of the copper reaches to 459.1MPa.The elongation to failure of the material decreases,while it is still above 20%.The electrical conductivity decreases with increasing the CCDC number.But the electrical conductivity retains 91.7%IACS after 15 passes CCDC.The results indicate that bulk pure copper with high strength and excellent electrical conductivity can be fabricated by SPD process of CCDC.