摘要
采用自然时效72 h+120℃24 h+185℃105 min+90℃12 h+150℃12 h的新型分级时效热处理工艺,获得了综合性能优异的7B05铝合金挤压型材。研究表明,经分级时效处理后,型材晶内析出相主要为η′相、少量η平衡相和GP区,晶界析出相呈断续分布,无沉淀析出带宽度控制在100 nm左右;型材的抗拉强度、屈服强度和断后伸长率分别达到了373 MPa,324 MPa和16.4%,晶间腐蚀等级为2级。
7B05 aluminum alloy profile with excellent comprehensive properties was obtained after multi-stage aging treatment with an optimized new process,i.e.natural aging for 72 h+120℃/24 h+185℃/105 min+90℃/12 h+150℃/12 h.After treatment,the precipitation configuration in the alloy is dominated by m'phase and supplemented by GP+n phase,the grain boundary phase is discontinuously distributed,and the width of precipitation-free zone is controlled at about 100 nm.The tensile strength,yield strength and elongation after fracture reach 373 MPa,324 MPa and 16.4%respectively,and the intergranular corrosion grade is 2.
作者
王建军
张臻
邓运来
WANG Jianjun;ZHANG Zhen;DENG Yunlai(CRRC Qingdao Sifang Co.,Ltd.,Qingdao 266111,China;Central South University,Changsha 410083,China;School of Materials Science and Engineering,Central South University,Changsha 410083,China)
出处
《轻合金加工技术》
CAS
2024年第1期36-44,共9页
Light Alloy Fabrication Technology
基金
中国国家铁路集团有限公司科技研究开发计划(K2021J040)。
关键词
7B05铝合金
分级时效处理
力学性能
晶间腐蚀性能
7B05 aluminum alloy
multi-stage aging treatment
mechanical properties
intergranular corrosion properties
作者简介
第一作者:王建军(1986-),男,山东海阳人,博士,正高级工程师。
