摘要
采用拉伸试验、电导率测量、光学显微镜及透射电镜等手段,研究超厚7085铝合金板的时效制度。结果表明：最佳时效制度为110℃×6 h＋160℃×9 h,该工艺下合金L、LT及ST向抗拉强度分别为524、516及513 MPa,屈服强度分别为489、483及477 MPa,伸长率分别为11.25%,10.25%及4.75%,应力腐蚀敏感因子值为198,满足标准AMS4403要求。合金板的显微组织由大量细小的亚晶及再结晶晶粒组成,时效析出相主要为η＇。
Aging process of ultra-thickness 7085 aluminum alloy plate was investigated by tensile test,electrical conductivity measurement,optical microscopy and transmission electron microscopy. The results show that the best aging process is 110 ℃ × 6 h ＋ 160 ℃ × 9 h,which leads to the tensile strength being 524,516 and 513 MPa,the yield strength being 489,483 and 477 MPa,the elongation rates being 11. 25%,10. 25% and 4. 75% in the L,LT and ST orientation,respectively. The value of stress corrosion sensitivity factor is 198. The above properties meets the requirements of standard AMS4403. The microstructure of the alloy plate consists of a large number of fine subgrains and recrystallized,and the aging precipitate phase is mainly η＇.
出处
《金属热处理》
CAS
CSCD
北大核心
2018年第1期179-183,共5页
Heat Treatment of Metals
基金
国家国际科技合作专项(2014DFA50210)
广西科学研究与技术开发计划(桂科合(1599005-2-6))
关键词
7085铝合金
双级时效
组织
力学性能
7085 aluminum alloy
two-step aging
microstructure
mechanical properties
