研究了高温预析出对Al-zn-Mg-Cu系7055合金的应力腐蚀、晶问腐蚀和剥蚀行为以及时效硬化的影响,并通过对预析出/时效组织的透射电镜观察,阐述了预析出对7055合金各种腐蚀行为和时效硬化的影响.组织观察及腐蚀性能和力学性能测试结果表明;高温预析出处理可使7055合金抗应力腐蚀性能得到明显改善,合金应力腐蚀开裂界限应力强度因子KISCC由7.4 MPa·m1/2提高至9.8 MPa·m1/2,合金抗拉强度仍能保持在680 MPa左右.经高温预析出处理后的7055合金晶间腐蚀、剥蚀敏感性降低,7055合金的剥蚀等级由EC降为EA-.同时,高温预析出处理使晶界析出相粗化显著、离散度增大,晶界平衡析出相的Cu含量为60.18 at%,且晶界析出相Cu含量提高.
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