Cu、Li质量比及微量Sc、Ti元素添加对铝锂合金均匀化工艺的影响  

Effects of Cu-Li mass ratio and trace Sc, Ti addition on homogenization process of Al-Li alloy

作　　者：马晓光 曾元松 蔡彦岑 刘丹阳[2] 韩宝帅 徐严谨 MA Xiao-guang;ZENG Yuan-song;CAI Yan-cen;LIU Dan-yang;HAN Bao-shuai;XU Yan-jin(Department of Materials Application Research,AVIC Manufacturing Technology Institute,Beijing 100024,China;School of Materials Science and Engineering,Central South University,Changsha 410083,China)

机构地区：[1]中国航空制造技术研究院新材料技术研究中心,北京100024 [2]中南大学材料科学与工程学院,长沙410083

出　　处：《中国有色金属学报》2023年第8期2401-2415,共15页The Chinese Journal of Nonferrous Metals

基　　金：航空工业制造院青年基金资助项目(KS912024144)。

摘　　要：采用熔铸法制备了不同Cu和Li含量,Cu、Li质量比及Sc、Ti元素添加的铝锂合金,通过金相组织观察、阳极覆膜金相观察、DSC测试、扫描电镜(SEM)观察、EDS元素分析等研究Cu、Li含量及Sc、Ti元素添加对铝锂合金均匀化优化工艺规律的影响。结果表明:铸态合金中存在粗大Al_(2)Cu相,含Ag、Zr(Sc)的晶界Al-Cu相和晶界AlCuMnFe(Ti)难熔相三种成分粒子;铝锂合金中优选均匀化温度随着Cu含量的升高而提高,并随着Cu、Li质量比的升高而降低;Sc元素的添加有利于优选均匀化温度的降低;Sc、Ti元素的复合添加促进优选均匀化温度的提高。Al-Li alloys with different Cu,Li contents,Cu-Li mass ratio and addition of Sc or(and)Ti elements were prepared by melting and casting method.Through the observation of metallographic structure,metallographic observation of anode coating,DSC,scanning electron microscope(SEM)observation,EDS element analysis,the effects of Cu and Li content and addition of Sc or(and)Ti elements on the optimization process of Al-Li alloy homogenization were studied.The results show that three type component particles exist in the alloy:coarse Al_(2)Cu phase,grain boundary Al-Cu phase containing Ag and Zr(Sc)and grain boundary AlCuMnFe(Ti)refractory phase.The preferred homogenization temperature in Al-Li alloys decrease with Cu content increasing and Cu-Li mass ratio.The addition of the Sc element contributes to the preferable reduction of the homogenization temperature.The compound addition of Sc and Ti element is most preferable to increase the homogenization temperature.

关 键 词：铝锂合金 均匀化制度 Cu、Li质量比 Sc、Ti微合金化 

分 类 号：TG379[金属学及工艺—金属压力加工]