Al-6Zn-2Mg-2Cu合金热处理后的拉伸与晶间腐蚀性能  

Tensile and intergranular corrosion properties of Al-6Zn-2Mg-2Cu alloy after heat treatments

作　　者：杨林[1] 高菁[1] 陶欣慈 林立[1] 陈立佳[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870

出　　处：《沈阳工业大学学报》2017年第1期17-21,共5页Journal of Shenyang University of Technology

基　　金：辽宁省自然科学基金资助项目(2013020083)

摘　　要：为了研究不同时效处理对Al-6Zn-2Mg-2Cu合金性能的影响,研究了强化固溶后T6和T76时效处理对Al-6Zn-2M g-2Cu合金硬度、拉伸性能与晶间腐蚀性能的影响.结果表明,强化固溶后与经过T6时效处理的合金相比,T76时效处理后合金的硬度并无明显变化,但合金的抗拉强度下降了4.39%,伸长率则明显上升.经T6和T76时效处理后,合金的晶间腐蚀等级均为4级.两种时效状态下合金腐蚀速率均在0~1.5 h范围内急剧增大,之后开始下降.经过强化固溶与T76时效处理后,合金的抗晶间腐蚀性能得到明显改善.In order to study the effect of different aging treatments on the properties of Al-6Zn-2Mg-2Cu alloy,the effect of T6 and T76 aging treatments after the strengthening solid solution on the hardness,tensile properties and intergranular corrosion properties of Al-6Zn-2Mg-2Cu alloy was investigated.The results show that after the strengthening solid solution,the hardness of the alloy with T76 aging treatment has no obvious change compared with that subjected to the T6 aging treatment.However,the tensile strength of the alloy decreases by 4.39%,while the elongation significantly increases.After the T6 and T76 aging treatments,the grade of intergranular corrosion of the alloy is both four grade.The corrosion rate of the alloy under two aging conditions increases rapidly within the range from 0 h to 1.5 h,and then starts to decrease.After the strengthening solid solution and T76 aging treatment,the intergranular corrosion resistance of the alloy gets obviously improved.

关 键 词：Al-6Zn-2Mg-2Cu合金 强化固溶 时效 显微组织 拉伸性能 晶间腐蚀 腐蚀动力学 拟合方程 

分 类 号：TG174.33[金属学及工艺—金属表面处理]