摘要
通过力学性能、电导率测试和差示扫描量热法(DSC)、能谱分析(EDX)及光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)观察,分析研究了固溶处理对Al-Li-Cu-Mg-Ag-Zr合金组织与性能的影响。结果表明:当固溶时间为30 min时,随固溶温度升高,合金的拉伸强度和硬度先升高后降低,520℃固溶温度下合金的力学性能最好;520℃下,随固溶时间的延长,合金力学性能也呈现出先升高后降低的趋势;520℃/30 min固溶处理的合金能获得最佳时效组织模式,T1相数量多、尺寸细小、弥散分布,合金的综合力学性能最佳,在此固溶制度下合金的断裂机制呈现穿晶断裂和沿晶分层断裂的混合断裂模式;固溶温度为525℃时合金有局部过烧现象。
The effects of solution treatment on the microstructure and mechanical properties of Al-Li-Cu-Mg-Ag-Zr alloy were investigated by means of tensile test, conductivity test, differencial scanning calorimeter（ DSC）, energy dispersive X-ray（ EDX）, optical microscopy （ OM ）, scanning electron microscopy （ SEM ） and transmission electron microscopy （TEM）, respectively. The results show that the tensile strength and hardness increase first and then decrease with the increase of the solution temperature when the solution holding time is 30 minutes. The optimal mechanical properties of the alloy are reached at 520 ℃. When the alloy is treated at 520 ℃ for different time, the mechanical properties increase first and then decrease with the inorease of solution holding time. The alloy obtains the optimum pattern of microstructure with a large quantity of dispersive fine Tl phase and best mechanical properties when it is treated at 520 for 30 minutes. The fracture mechanism of the alloy is mixed fracture consisting of transgranular fracture and intergranular layered cracks. The alloy gets overburnt when the solution temperature is 525 ℃.
出处
《矿冶工程》
CAS
CSCD
北大核心
2011年第6期98-102,共5页
Mining and Metallurgical Engineering
基金
总装备部重点基金项目(6140506)
作者简介
王华（1985-），女，陕西宝鸡人，硕士研究生，从事铝锂合金基础性能研究。
通讯作者：尹登峰（1966-），男，湖南株洲人，副教授，博士，主要从事有色金属材料研究。
