摘要
研究了不同应变速率下5B70铝合金的拉伸断口。结果表明:随着应变速率的增加,合金的断后伸长率下降。断口分析表明,应变速率越低,断口中的韧窝数量多且深度深,表现出明显的高韧性断裂。随着应变速率的增加,出现准解理面,合金偏向于脆性断裂。随着应变速率的增加,合金断口侧面晶粒伸长减小,析出相的数量减少。
Tensile fractures of 5 B70 aluminum alloy at different strain rates were investigated.The results show that as the strain rate increases,the elongation of the alloy decreases.Fracture analysis shows that the lower the strain rate,the greater are the number of dimples in the fracture and the deeper depth,showing obvious high ductile fracture.With the increase of strain rate,the quasi-cleavage plane appears,the alloy is biased towards brittle fracture.Secondary cracks also occur at lower strain rates.As the strain rate increases,the grain elongation on the side of the alloy fracture decreases,and a fine precipitate phase appears.
作者
周巍
姜锋
赖松柏
方杰
童蒙蒙
Zhou Wei;Jiang Feng;Lai Songbai;Fang Jie;Tong Mengmeng(Light Alloy Research Institute,Central South University,Changsha Hunan 410083,China;Science and Technology on High Strength Structural Materials Laboratory,Changsha Hunan 410083,China;School of Materials Science and Engineering,Central South University,Changsha Hunan 410083,China;Beijing Institute of Manned Space System Engineering,China Academy of Space Technology,Beijing 100094,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2020年第3期231-234,共4页
Heat Treatment of Metals
关键词
5B70铝合金
应变速率
显微组织
准解理断裂
断口分析
5B70 aluminum alloy
strain rate
microstructure
quasi-cleavage fracture
fracture analysis
作者简介
周巍(1993-),男,硕士研究生,主要从事5B70铝合金研究,E-mail:jfeng2@csu.edu.cn;通讯作者:姜锋,教授,博士,主要从事高性能有色金属新材料(铝钪合金、铜铬锆合金、铁基合金等)研究,E-mail:jfeng@csu.edu.cn。
