采用拉伸试验、电导率测试、晶间腐蚀实验、金相显微镜观察等方法研究不同时效制度对7A85高强铝合金的力学性能和晶间腐蚀性能的影响.研究结果表明:时效温度为110~140℃时,7A85铝合金的电导率随着时效温度的升高而增加,晶间腐蚀深度逐渐变浅,合金的抗晶间腐蚀性能提高;在120℃时效温度下,时效时间为30 h时达到第1个峰值硬度;在时效温度为120℃时,电导率随着时效时间的延长而增加,合金的晶间腐蚀深度减小,即合金的晶间腐蚀敏感性随时间的延长而降低.经过470℃/2 h +120℃/30 h时效工艺处理后,7A85铝合金的抗拉伸强度为710.3MPa,屈服强度为655.46MPa,伸长率为11.25%,电导率为30.7%IACS,平均晶间腐蚀深度为0.100 mm;该热处理制度可以使合金在保持良好力学性能的同时,有高的耐晶间腐蚀性能.
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