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采用6种不同的冷拔和退火工艺制备了铝合金导线,研究了退火工艺和冷拔变形对合金显微组织、电导率和力学性能的影响,并对比分析了后续中间退火和炉冷方式对合金最终电导率的影响。结果表明,拉拔至3.5 mm进行350℃中间退火然后拉拔至?2.5 mm的拉拔工艺得到的电导率最大;随着冷拔后中间退火温度的升高,合金导线的抗拉强度降低而塑性升高,且冷拔至?3.5 mm时试样的中间退火对性能的影响更为明显;冷拔和中间退火态合金导线中的物相都主要为α-Al、Al Fe、AlFeSi和AlFeSiMn相;随着退火温度的升高,空冷和炉冷方式下合金导线的电导率都表现为先增加而后降低的趋势,在退火温度为330℃时取得最大值。
Six kinds of cold drawing and annealing processes were used to prepare the aluminum alloy wire. The effects of annealing process and cold drawing deformation on the microstructure, electrical conductivity and mechanical properties of the alloy were studied. The effects of subsequent intermediate annealing and furnace cooling methods Effect of alloy final conductivity. The results show that the electrical conductivity obtained after drawing to 3.5 mm for intermediate annealing at 350 ° C and then drawing to 2.5 mm is the highest. With the increase of intermediate annealing temperature after cold drawing, the tensile strength of the alloy wire decreases The plasticity increases, and the influence of intermediate annealing on the properties is more obvious when cold-drawing to 3.5 mm. The phases of cold drawn and intermediate annealed alloy wires are mainly α-Al, AlFe, AlFeSi and AlFeSiMn Phase. With the increase of annealing temperature, the conductivities of the alloy wires increased firstly and then decreased with air cooling and furnace cooling, and reached the maximum value when the annealing temperature was 330 ℃.