【摘要】 为在提高钢芯铝绞线导电率的同时兼顾其机械强度，选用L3高导电率硬铝线作为原材料，对冷拉拔后的铝单线进行265℃半退火处理，系统考察了退火时间对其导电率、抗拉强度及断裂伸长率的影响。结果表明，随退火时间延长，铝单线导电率由62.8%IACS升至约63.8%IACS；抗拉强度由185 MPa降低至约110 MPa，但仍大于100 MPa；断裂伸长率较原始状态提高近5倍。整个退火过程处于“回复—再结晶”的过渡态。随退火时间延长，导线内部〈1 1 1〉∥Z轴织构减少、位错密度较初始状态减小，晶界散射强度降低，导电率得到改善；期间释放大量应力能，损失了一定的抗拉强度。综合考虑导电率、强度和塑性，推荐钢芯铝绞线选用L3高导电率硬铝线，采用260—270℃、90—120min的半退火工艺，以制备兼具较高导电率和足够强度的半硬铝导线。更多还原

【Abstract】 To improve the conductivity of aluminum conductor steel-reinforced while maintaining sufficient mechanical strength, L3 high-conductivity hard aluminum wire was selected as the starting material and subjected to semi-annealing at 265 °C after cold drawing. The effects of annealing time on the electrical and mechanical properties of the single wires were systematically investigated. The results show that the electrical conductivity of L3 aluminum single wire is enhanced from 62.8 %IACS up to approximately 63.8 %IACS with prolonged annealing time. The tensile strength decreases from about 185 MPa to about 110 MPa but still remains above 100 MPa, while the elongation at break increases by nearly five times. The entire annealing process remains in a recovery-recrystallization transition state. With prolonged annealing time, the <111> // Z-axis texture within L3 aluminum single wire diminishes, the dislocation density decreases relative to the initial state, the grain boundary scattering intensity is reduced, and the electrical conductivity is consequently improved. A large amount of strain energy is released during the process, resulting in a certain loss of tensile strength. Considering conductivity, strength and ductility comprehensively, a semi-annealing process of 260–270 °C for 90–120 min is recommended for L3 high-conductivity hard aluminum wire used in ACSR to obtain semi-hard aluminum conductors with high conductivity and sufficient strength.更多还原