摘要
采用显微分析技术和统计分析方法研究了Al-6Zn-2Mg-2Cu合金经固溶+T6或T76时效处理后的显微组织和在腐蚀环境下的晶间腐蚀行为及腐蚀深度的动力学。结果表明:T76时效后,第二相细小弥散分布在晶粒内部,体积分数较大,且在其晶界处也有析出物分布,晶粒尺寸更为细小;经T6时效后的合金,第二相颗粒较大,呈分布于晶内;与经T6处理后的相比较,经T76时效后的合金具有更强的抗晶间腐蚀性能;经T76、T6时效处理后,合金的晶间腐蚀随时间变化曲线分别为:y=6.43898x^(0.43698)、y=7.72673x^(0.43702)。
Microstructure,intergranular corrosion behavior and kinetics of corrosion depth under corrosive environment of Al-6Zn-2Mg-2Cu alloy after solid solution and T6 or T76 aging treatments were studied by microscopic analysis technique and statistical analysis method.The results show that after T76 aging treatment,the fine dispersion of the second phase of the alloy is distributed in the grain interior,its volume fraction is larger,and the second phase with fine grain size also distributes at the grain boundaries. The second phase particles of the alloy are larger after T6 aging treatment,which are distributed in the grain. The alloy has stronger resistance to intergranular corrosion after T76 aging treatment compared with T6 aging treatment. The variation curves of intergranular corrosion of the alloy after T76 and T6 aging treatments with time are y = 6. 43898x^（0. 43698）,y = 7. 72673x^（0. 43702）,respectively.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2016年第12期62-66,共5页
Transactions of Materials and Heat Treatment
基金
辽宁省自然科学基金项目(2013020083)
关键词
超高强铝合金
热处理
显微组织
晶间腐蚀
析出相
ultrahigh strength aluminum alloys
heat treatment
microstructure
intergranular corrosion
precipitated phase
