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在深冷条件下对铜线进行了拉丝变形。研究了深冷变形过程中不同拉丝模直径对铜线组织性能的影响规律及其机制。结果表明,一些亚晶、孪晶、微结构等在变形后期不断产生;铜线抗拉强度随拉丝模具直径的减小而急剧增大,其伸长率则不断下降;铜线电导率随拉丝模具直径的减小则出现了先降后升的变化趋势,其原因是晶粒的变细导致晶界和晶体内缺陷增加,使得电传输时自由电子散射增加而降低了电导率;而在变形后期,组织中孪晶数量的增多降低了自由电子的散射,铜线电导率增加。
Under the conditions of cold drawing of copper wire drawing deformation. The influence of different drawing die diameter on the microstructure and properties of copper wire during cryogenic deformation was studied. The results show that some of the subgrain, twin and microstructure are continuously produced in the late stage of deformation. The tensile strength of copper wire increases sharply with the decrease of the diameter of wire drawing dies, while its elongation decreases. The conductivity of copper wire increases with wire drawing The decrease of die diameter leads to the trend of decreasing firstly and then increasing. The reason is that the grain refinement leads to the increase of grain boundary and intracrystalline defects, which leads to the increase of free electron scattering during electric transport and the decrease of electric conductivity. Later, the increase in the number of twins in the tissue reduced the scattering of free electrons and the copper conductivity increased.