采用SEM,TEM及疲劳性能测试等分析测试手段,系统地研究了2E12 铝合金在室温空气、潮湿气体及盐雾环境下的疲劳裂纹扩展速率.结果发现2E12合金具有良好的疲劳性能,疲劳裂纹扩展速率优于国外的2524铝合金.利用修正的Paris公式分析腐蚀介质对合金的疲劳裂纹扩展性能影响轻重程度依次为:室温空气《潮湿气体《盐雾环境.不同环境条件下合金的疲劳裂纹形貌均表现微观裂纹扩展的晶界小平面、宏观裂纹扩展的疲劳条纹以及剪切撕裂的微观结构.在腐蚀环境下,宏观裂纹扩展表现出更多的脆性裂纹扩展特征,氢脆导致塑性区脆化及腐蚀诱导的阳极溶解是导致裂纹扩展性能降低的原因.
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