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运用光学显微镜、扫描电镜和透射电镜研究了冷拉拔铝合金Al-0.7Fe-0.2Cu在不同退火处理制度下的微观组织结构演变,并分析了其对电导率和力学性能的影响。结果表明:300℃退火,初生相Al(Fe,Cu)中Cu元素部分回溶于基体,500℃退火,Cu元素几乎完全回溶于基体;冷拉拔Al-0.7Fe-0.2Cu丝材再结晶温度为300～350℃;450℃长时间退火后,再结晶晶粒长大不明显,但有极少量的晶粒出现异常长大现象,这主要是因为Al(Fe,Cu)相分布不均匀对晶粒长大的影响;其电导率在250℃×2h条件下退火达到最大值;超过350℃长时间退火其抗拉强度趋于稳定,伸长率降低。冷拉拔合金在350℃×2h退火处理制度下,拥有最优异的导电性能和力学性能。
The microstructural evolution of Al-0.7Fe-0.2Cu alloy under different annealing conditions was investigated by optical microscope, scanning electron microscope and transmission electron microscope. The effects of Al-0.7Fe-0.2Cu on electrical conductivity and mechanical properties were also analyzed. The results show that the Cu element in the primary phase Al (Fe, Cu) is partly dissolved in the matrix and annealed at 500 ℃, and the Cu element is almost completely dissolved in the matrix after annealing at 300 ℃. The Al-0.7Fe-0.2Cu wire The crystallization temperature is 300-350 ℃. After annealing at 450 ℃ for a long time, the grain growth of recrystallization is not obvious but a very small amount of grain growth occurs abnormally. This is mainly because the phase distribution of Al (Fe, Cu) Uniform on the grain growth; its conductivity at 250 ℃ × 2h annealed to reach the maximum value; more than 350 ℃ annealing for a long time its tensile strength tends to be stable, the elongation decreased. Cold-drawn alloy has the most excellent conductivity and mechanical properties under the annealing treatment of 350 ℃ × 2h.