【摘要】 研究了经多次冷拔或冷拔配合中间热处理制得的形变Cu11.5%Fe原位复合材料的组织、强度和导电性。用SEM和TEM观察分析了材料的组织结构。结果发现,形变量η≥5.37的形变Cu11.5%Fe原位复合材料的Fe树枝晶已成为细纤维状,在横截面呈薄片弯曲状。形变量越大,纤维越均匀细化。力学性能和电阻率测试结果发现,随形变量增加,强度提高,同时电阻率增大。中间热处理可在不损失强度的同时,明显降低电阻率。经3次中间热处理后,不同形变量下的材料电阻率均可下降约4.4μΩ·cm。几个较好的电导率和极限抗拉强度组合为:70.6%/659MPa(Φ0.8)、64.6%/752MPa(Φ0.5)和51.9%/880MPa(Φ0.2)。更多还原

【Abstract】 Structure, strength and electrical conductivity of Cu-11.5%Fe in situ composite obtained by cold drawing or cold drawing combined with intermediate heat treatments were investigated. The structures of the composites were examined by SEM and TEM. The results indicate that the Fe dendrites were drawn into fine ribbons and the Fe ribbons are curl and fold in cross-section at strain η≥ 5.37. The fine ribbons are finer and more uniform with the strain increasing. The experimental results show that the tensile strength and electrical resistivity increase with the increasing of deformation strain. After intermediate heat treatments, the strength remains, but the electrical resistivity decreases drastically. The electrical resistivity of the in situ composite with different strains can decrease (about ) 4.4 μΩ·cm after a series of intermediate heat treatments. The good combinations of the electrical conductivity and the tensile strength are the following: 70.6% IACS (International Annealed Copper Standard)/659MPa (Φ 0.8),64.6% IACS/752MPa (Φ 0.5) and 51.9% IACS/880MPa (Φ 0.2).更多还原