摘要
通过金相显微分析(OM)、扫描电镜观察(SEM)、透射电镜观察(TEM)、X射线衍射(XRD)、显微硬度测试、拉伸性能测试和断裂韧性测试,研究不同时效制度对2050铝锂合金组织及性能的影响。结果表明:2050铝锂合金的最佳时效制度为(145℃,80 h)。T8态合金峰时效的主要析出相为T_1相和S相,其中主要强化相为尺寸细小弥散分布的T_1相,合金强化效果较好。实验合金经时效处理后存在明显的各向异性,合金沿轧制方向的屈服强度和抗拉强度最高。随着时效温度升高,合金断裂韧性下降。
The effects of aging process on the microstructure and properties of 2050 Al-Cu-Li alloy were investigated by optical microscopy,scanning electron microscopy,transmission electron microscopy,hardness tests,tensile properties tests and fracture toughness tests.The results show that the optimum aging treatment is determined as(145℃,80 h).The main precipates of the alloy in T8 temper are T1 phase and S phase at peak aging.The number of S phase is very small and the main strengthenning phase is T1 phase and the strengthening effect is better.The anisotropy during aging treatment for 2050 Al-Li alloy shows that,the yield strength and tensile strength of rolling orientation are the highest.With the increase of temperature,the fracture toughness of alloy decreases.
作者
李红英
王小雨
余玮琛
LI Hong-ying;WANG Xiao-yu;YU Wei-chen(School of Materials Science and Engineering,Central South University,Changsha 410083,China;Key Laboratory of Nonferrous Metal Materials Science and Engineering,Ministry of Education,Central South University,Changsha 410083,China;Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Center,Central South University,Changsha 410083,China;Science and Technology on High Strength Structural Materials Laboratory,Changsha 410083,China)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2018年第12期2433-2440,共8页
The Chinese Journal of Nonferrous Metals
