航空材料学报2011，Vol.31Issue(2)：13-17,5.DOI:10.3969/j.issn.1005-5053.2011.2.003
均匀化处理对7A55铝合金组织与性能的影响
Effects of Homogenization Treatment on Microstructure and Properties of 7A55 Aluminum Alloy
摘要
Abstract
The effect of single homogenization treatment and two-stage homogenization treatment on microstructure and properties of the as-cast 7A55 aluminum alloy were investigated. The results show that the residual eutectic structure is still more after single homogenization treatment at 450℃. After 450℃/60h homogenization treatment, the area fraction of residual eutectic decreases from 15.2％ to 7.2％ , and hardness reduces from 72HRB to 60HRB, whereas elongation increases from 2. 1％ to 11.2％. The non-equilibrium eutectic significantly reduces after 450℃/60h + 470℃ two-stage homogenization. It is found that a large number of equilibrium phase is precipitated during cooling. After 450℃/60h + 470℃/12h two-stage homogenization, the area fraction of residual eutectic is only 2.3％,and hardness is reduced by about 17HRB compared to the as-cast alloy. In the meanwhile ,the elongation is 15.3％. According to the experimental results, the proper homogenization treatment of 7A55 aluminum alloy is 450℃/60h + 470℃/12h.关键词
7A55铝合金/均匀化/共晶组织/保温时间Key words
7A55 aluminum alloy/ homogenization/ eutectic structure/ holding time分类
金属材料引用本文复制引用
李忠盛,潘复生,吴护林,陈韵如..均匀化处理对7A55铝合金组织与性能的影响[J].航空材料学报,2011,31(2):13-17,5.基金项目
预先研究(51312050107) （51312050107）
重庆市科技攻关计划(2009AC4015) （2009AC4015）
