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对建筑用6061铝合金进行了不同温度的均匀化退火处理,采用光学显微镜(OM)、扫描电镜(SEM)和能谱仪(EDS)对比分析了铸态和热处理态6061合金的显微组织的变化,研究了6061合金热处理前后的电导率和力学性能变化规律。结果表明,半连续铸造6061铝合金中的主要物相为α-Al基体、Mg_2Si、β-AlFeSi相和α-Al_(12)(FeMn)_3Si_2相;均匀化退火温度超过580℃时,6061铝合金开始发生过烧现象;随着均匀化退火温度升高,合金的屈服强度、抗拉强度、伸长率和断面收缩率都表现为先增加而后降低的趋势,在均匀化退火温度为575℃时取得最大值;6061铝合金适宜的均匀化退火温度为575℃。
The 6061 aluminum alloy for construction was homogenized and annealed at different temperatures. The microstructure of as-cast and heat-treated 6061 alloy was analyzed by optical microscope (OM), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) The changes of electrical conductivity and mechanical properties of 6061 alloy before and after heat treatment were studied. The results show that the main phases of semi-continuous casting 6061 aluminum alloy are α-Al matrix, Mg_2Si, β-AlFeSi phase and α-Al_ (12) (FeMn) _3Si_2 phase. When homogenization annealing temperature exceeds 580 ℃, With the homogenization annealing temperature increasing, the yield strength, tensile strength, elongation and reduction of area of alloy showed the trend of first increasing and then decreasing. When the homogenization annealing temperature was 575 ℃ When the maximum value; 6061 aluminum alloy suitable annealing temperature of 575 ℃.