纯铝线强度和导电率反常制约现象及机制分析

Study on the phenomenon and the mechanism of the abnormal strength-electrical conductivity relation of the pure aluminum wire

在金属成形过程中,其强度和导电率通常呈现出明显的制约关系。然而,在工业纯铝拉丝加工过程中,不同道次的工业纯铝线的强度和导电率却呈现出了反常制约关系。通过对不同道次的工业纯铝线的强度和导电率的测试以及微观组织表征,揭示了工业纯铝线在拉丝成形加工过程中的反常制约机制。结果表明,晶粒在径向的细化以及在轴向的拉长有利于提高纯铝线的强度,同时也有利于改善其导电率;在拉丝过程中产生的<111>丝织构对强度有贡献且不影响导电率。因此,不同道次的工业纯铝线的强度和导电率实现了同步提升。这一研究成果对钢芯铝绞线用工业纯铝线的生产具有指导意义。

During the forming process of metal, strength and electrical conductivity are mutually conditioned. However, during the drawing process, the strength and the electrical conductivity of the commercially pure aluminum wire ＇after different passes of cold drawing exhibit an abnormal strength-electrical relation. The strength and the electrical conductivity of the commercially pure aluminum wire were tested, and additionally the microstructure of the commercially pure aluminum wire was also characterized, in order to reveal the mecha- nism of the abnormal strength-electrical conductivity relation. The results show that the re- finement of grains in radial direction favors the improvement of strength and the elongation of grains in the axial direction was also helpful for the electrical conductivity. Simultaneously,the 〈 111 〉 texture formed during the drawing process makes a positive contribution to the strength without affecting the electrical conductivity. Thus, the strength and the electrical conductivity were improved simultaneously. This result and its mechanism have great signifi- cance for guiding the production of the steel-reinforced aluminum conductor.