分级时效对7B05铝合金型材组织性能的影响
Microstructure and properties of 7B05 aluminum alloy after multi-stage aging treatment
王建军 1张臻 2邓运来3
作者信息
- 1. 中车青岛四方机车车辆股份有限公司,山东青岛 266111
- 2. 中南大学,湖南长沙 410083
- 3. 中南大学材料科学与工程学院,湖南长沙 410083
- 折叠
摘要
采用自然时效72h+120℃24h+185℃105min+90℃12h+150℃12h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ŋ'相、少量ŋ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.
Abstract
7B05 aluminum alloy profile with excellent comprehensive properties was ob-tained 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 ŋ'phase and supplemented by GP+ŋ phase,the grain boundary phase is discontinuously distributed,and the width of precipita-tion-free zone is controlled at about 100 nm.The tensile strength,yield strength and elonga-tion after fracture reach 373 MPa,324 MPa and 16.4％respectively,and the intergranular corrosion grade is 2.
关键词
7B05铝合金/分级时效处理/力学性能/晶间腐蚀性能Key words
7B05 aluminum alloy/multi-stage aging treatment/mechanical properties/intergranular corrosion properties引用本文复制引用
基金项目
中国国家铁路集团有限公司科技研发计划(K2021J040)
出版年
2024
NETL
NSTL
万方数据