1973铝合金铸态组织及均匀化退火组织研究  

Microstructure of As-cast and Homogenized 1973 Aluminum Alloy

作　　者：王正安[1,2] 汪明朴[1] 杨文超[1] 张茜[1] 盛晓菲[1] 李周[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]中南大学教育部有色金属材料科学与工程实验室,长沙410083

出　　处：《材料工程》2010年第5期56-63,共8页Journal of Materials Engineering

基　　金：国家"863"项目(2006AA03Z517)

摘　　要：采用光学金相显微镜、扫描电镜、X射线、DSC等分析手段研究了1973高强铝合金铸态和均匀化态的显微组织和成分分布。结果表明:合金铸态组织为枝晶结构,主要存在α-Al,MgZn2(η相)和Al2CuMg(S相),还存在少量的Al13(FeCu)4相。其中MgZn2相中固溶部分Al原子和Cu原子,Al2CuMg相中固溶分布Zn原子。该合金合适的均匀化处理工艺为470℃/24h。均匀化后,原铸态合金中的MgZn2(η相)和Al2CuMg(S相)回溶到基体,仅残留少量Al13(FeCu)4相和Al7Cu2Fe相,晶内析出大量弥散分布的球形Al3Zr粒子。The microstructure and the composition distribution of as-cast and homogenized 1973 alloy were studied by means of optical micrograph,scanning electron micrograph,X-ray diffractometry and DSC.The as-cast microstructure and the homogenizing temperatures of the alloy were determined.The results show that the as-cast microstructure is dendrite structure.It mainly consists of α-Al,MgZn2（η） phase and Al2CuMg（S） phase,and Al13（FeCu）4 phases were also observed.The η phase（MgZn2） dissolves aluminum and copper,and Al2CuMg phase shows solubility of zinc.The proper homogenizing process of this alloy is at 470℃ for 24h.After homogenization,η phase and S phase dissolve almost into the matrix,leaving a small amount Al13（FeCu）4 phase and Al7Cu2Fe phases only.A large number of Al3Zr phases with spheric shape were also observed,dispersing inside grains.

关 键 词：AL-ZN-MG-CU合金 均匀化 显微组织 

分 类 号：TG113.12[金属学及工艺—物理冶金]