等温退火对8030铝合金导线组织性能的影响

Effect of isothermal annealing on microstructure and properties of 8030 aluminum alloy wire

研究了不同等温退火工艺对8030铝合金导线组织及性能的影响。结果表明:等温退火前后合金均由α-Al基体和Al6Fe相组成。在同一等温温度下,随着等温时间的延长组织逐渐趋于均匀化;同一等温时间下,随着等温温度的升高,组织趋于均匀化的时间缩短。经过等温退火处理后铝合金导线的导电率均有所提高,在470℃均匀化退火24 h后再经240℃等温4 h,合金导电率达到最高值57. 21%IACS,比未经热处理试样的导电率提高了2. 4%IACS。经过等温退火处理后铝合金导线的硬度及抗拉强度均有所降低,塑性大幅度提高。在470℃均匀化退火24 h后再经260℃等温8 h,合金的伸长率最高可达23. 64%。热处理前后合金均为塑性断裂。

Effects of different isothermal annealing processes on the microstructure and properties of 8030 aluminum alloy wire were studied.The results show that the aluminum alloy wires are both composed of α-Al matrix and Al6Fe phase before and after the isothermal annealing.After the isothermal annealing,at the same isothermal temperature,the microstructure gradually becomes uniform with the extension of the isothermal time. Under the same isothermal time,as the isothermal temperature increases,the isothermal time at which the structure tends to be uniform is shortened. After isothermal annealing,the electrical conductivity of aluminum alloy wires is improved. After uniform annealing at470 ℃ for 24 h and then at 240 ℃ for 4 h,the electrical conductivity of the alloy reaches the highest value of 57. 21% IACS,which is 2. 4%IACS higher than that of the untreated samples. After the isothermal annealing,the hardness and tensile strength of the aluminum alloy wire are reduced,but the plasticity is greatly improved. After annealing at 470 ℃ for 24 h and then isothermal treated at 260 ℃ for 8 h,the elongation of the alloy is up to 23. 64 %. Before and after heat treatment,the alloys before and after heat treatment are both plastic fracture.