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借助DSC、SEM、EDS等手段分析了均匀化热处理工艺参数对6061铝合金组织与力学性能的影响规律。结果表明:铸态6061铝合金中析出相主要包括Mg_2Si、β-Al_5FeSi、β-Al5(FeMn)Si及少量的α-Al_(12)(FeMn)_3Si_2。随均匀化加热温度升高,铸态合金枝晶网状组织变得不连续,且基体逐渐析出大量弥散相。当均匀化温度超过580℃时,基体出现复熔球,即合金出现过烧现象。加热温度在550~590℃范围内,合金的强度和塑性随均匀化加热温度的升高,呈先增大后减小的趋势,在575℃时达到最佳值;延长保温时间,合金的强度增大,而塑性则先减小后增大。
The effects of the parameters of homogenization heat treatment on the microstructure and mechanical properties of 6061 aluminum alloy were analyzed by means of DSC, SEM and EDS. The results show that the precipitated phases in cast 6061 aluminum alloy mainly include Mg 2 Si, β-Al 5 FeSi, β-Al 5 (FeMn) Si and a small amount of α-Al 12 FeMn 3 Si 2. With the homogenization heating temperature increases, as-cast alloy dendrite network becomes discontinuous, and the matrix gradually precipitated a large number of dispersed phase. When the homogenization temperature exceeds 580 ℃, the matrix appears reflow ball, that is, the alloy appeared over-burning phenomenon. When the heating temperature is in the range of 550-590 ℃, the strength and ductility of the alloy increase with the increase of the heating temperature, and then increase and then decrease, reaching the best value at 575 ℃. Extending the holding time, the strength of the alloy Increase, while plasticity decreases first and then increases.