采用拉伸试验、晶间腐蚀试验、金相及透射电镜观察,研究双级时效对6061铝合金拉伸性能和晶间腐蚀性能的影响.结果表明:6061铝合金经(180 ℃, 8 h)的T6峰值时效,抗拉强度和屈服强度分别为356 Mpa和331.6 Mpa,伸长率为13.7%,但出现严重的晶间腐蚀,腐蚀深度约为270 (m.在T6峰值时效的基础上进一步升高温度和延长时间进行二级时效,合金强度总体上呈逐渐降低趋势,电导率逐渐上升,腐蚀类型也由晶间腐蚀逐渐转变为点蚀,腐蚀深度明显变浅.对于6061铝合金,最佳双级时效工艺为(180 ℃, 8 h)+(210 ℃, 2 h),抗拉强度为348.4 Mpa,屈服强度为320.3 Mpa,伸长率为11.3%,腐蚀类型为轻微点蚀,腐蚀深度约为50μm.
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