第36卷第11期 北京科技大学学报 Vol.36 No.11 2014年11月 Journal of University of Science and Technology Beijing Now.2014 先进高强韧AI-Zn-Mg-Cu合金凝固和均匀化组织及 相构成 舒文祥)，侯陇刚，刘君城区，刘俊涛2，张济山”，庄林忠 1)北京科技大学新金属材料国家重点实验室，北京100083 2)北京有色金属研究总院有色金属材料制备加工国家重点实验室，北京100088 通信作者，E-mail:liujuncheng9401@gmail..com 摘要采用热力学计算与实验相结合的方法，研究了两种高强韧A-Z-Mg一Cu合金铸态及均匀化态的显微组织和相构 成.铸态A合金主要由Mg(Zn,Al,Cu),相和少量AL,Cu相组成，而铸态B合金仅含Mg(Zn,Al,Cu),相.热力学计算显示，A 和B两种合金的实际凝固过程介于Lever Rule和Scheil Model两种模拟结果之间，由于合金成分不同而导致的铸态A和B合 金中各相含量差异与Scheil Model模拟所得到的各相摩尔分数变化规律基本一致.经常规工业均匀化处理(460℃保温24h), 铸态A和B合金中存在的Mg(Z,Al,Cu),或AL,Cu相均能充分回溶，并得到单相a(AI)基体，这与热力学计算所得到的Al- Zm-MgCu四元系统在7.5%Zn条件下460℃等温相图相符合. 关键词铝合金：热力学计算：凝固：均匀化：相图 分类号TG146.21 Microstructure and phase components of as-cast and homogenized advanced Al-Zn-Mg-Cu alloys with high strength and toughness SHU Wen-xiang",HOU Long-gang,LIU Jun-cheng,LIU Jun-tao,ZHANG Ji-shan,ZHUANG Lin-zhong 1)State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083.China 2)State Key Laboratory for Fabrication and Processes of Nonferrous Metals,General Research Institute for Nonferrous Metals,Beijing 100088,China Corresponding author,E-mail:liujuncheng9401@gmail.com ABSTRACT The microstructure and phase components of as-east and homogenized Al-Zn-Mg-Cu alloys with high strength and toughness were studied by combining thermodynamic calculation with experiments.It is found the secondary phases presented in as-cast alloy A are Mg(Zn,Al,Cu)2 and a small amount of Al Cu:however,only Mg(Zn,Al,Cu)2 is found in as-east alloy B.Thermodynam- ic calculation results show that the real solidification paths of alloys A and B fall between simulations by the Lever rule and the Scheil model,and the differences in content of phases in the two as-cast alloys are consistent with the regularity of the calculated mole fraction of phases formed after solidification in the Scheil model.Mg(Zn,Al,Cu),or Al,Cu phase in as-cast alloys A and B can be dissolved completely after conventional homogenization treatment (holding at 460 C for 24 h),single a(Al)phase can be obtained,and this is consistent with the calculated isothermal section of the Al-Zn-Mg-Cu phase diagram with 7.5%Zn at 460C. KEY WORDS aluminum alloys;thermodynamic calculations;solidification:homogenization:phase diagrams A1-Zn-MgCu合金因具有高比强度、较好的耐7075、7050和7055高强铝合金.然而，随着新一代 腐蚀和疲劳性能而被广泛用于航空航天领域，如大飞机的发展，这些合金由于淬火敏感性相对较高 收稿日期：201409一16 基金项目：中央高校基本科研业务费专项资金资助项目(FRF-TD-12001):国家高技术研究发展计划资助项目(2013AA032403) DOI:10.13374/j.issn1001-053x.2014.11.016:http://journals.ustb.edu.cn第 36 卷 第 11 期 2014 年 11 月 北京科技大学学报 Journal of University of Science and Technology Beijing Vol． 36 No． 11 Nov． 2014 先进高强韧 Al--Zn--Mg--Cu 合金凝固和均匀化组织及 相构成 舒文祥1) ，侯陇刚1) ，刘君城1) ，刘俊涛1，2) ，张济山1) ，庄林忠1) 1) 北京科技大学新金属材料国家重点实验室，北京 100083 2) 北京有色金属研究总院有色金属材料制备加工国家重点实验室，北京 100088  通信作者，E-mail: liujuncheng9401@ gmail． com 摘 要 采用热力学计算与实验相结合的方法，研究了两种高强韧 Al--Zn--Mg--Cu 合金铸态及均匀化态的显微组织和相构 成． 铸态 A 合金主要由 Mg( Zn，Al，Cu) 2相和少量 Al2Cu 相组成，而铸态 B 合金仅含 Mg( Zn，Al，Cu) 2相． 热力学计算显示，A 和 B 两种合金的实际凝固过程介于 Lever Ｒule 和 Scheil Model 两种模拟结果之间，由于合金成分不同而导致的铸态 A 和 B 合 金中各相含量差异与 Scheil Model 模拟所得到的各相摩尔分数变化规律基本一致． 经常规工业均匀化处理( 460 ℃保温 24 h) ， 铸态 A 和 B 合金中存在的 Mg( Zn，Al，Cu) 2或 Al2Cu 相均能充分回溶，并得到单相 α( Al) 基体，这与热力学计算所得到的Al-- Zn--Mg--Cu 四元系统在 7. 5% Zn 条件下 460 ℃等温相图相符合． 关键词 铝合金; 热力学计算; 凝固; 均匀化; 相图 分类号 TG146. 2 + 1 Microstructure and phase components of as-cast and homogenized advanced Al--Zn--Mg--Cu alloys with high strength and toughness SHU Wen-xiang1) ，HOU Long-gang1) ，LIU Jun-cheng1)  ，LIU Jun-tao1，2) ，ZHANG Ji-shan1) ，ZHUANG Lin-zhong1) 1) State Key Laboratory for Advanced Metals and Materials，University of Science and Technology Beijing，Beijing 100083，China 2) State Key Laboratory for Fabrication and Processes of Nonferrous Metals，General Ｒesearch Institute for Nonferrous Metals，Beijing 100088，China  Corresponding author，E-mail: liujuncheng9401@ gmail． com ABSTＲACT The microstructure and phase components of as-cast and homogenized Al--Zn--Mg--Cu alloys with high strength and toughness were studied by combining thermodynamic calculation with experiments． It is found the secondary phases presented in as-cast alloy A are Mg( Zn，Al，Cu) 2 and a small amount of Al2Cu; however，only Mg( Zn，Al，Cu) 2 is found in as-cast alloy B． Thermodynam￾ic calculation results show that the real solidification paths of alloys A and B fall between simulations by the Lever rule and the Scheil model，and the differences in content of phases in the two as-cast alloys are consistent with the regularity of the calculated mole fraction of phases formed after solidification in the Scheil model． Mg( Zn，Al，Cu) 2 or Al2Cu phase in as-cast alloys A and B can be dissolved completely after conventional homogenization treatment ( holding at 460 ℃ for 24 h) ，single α( Al) phase can be obtained，and this is consistent with the calculated isothermal section of the Al--Zn--Mg--Cu phase diagram with 7. 5% Zn at 460 ℃ ． KEY WOＲDS aluminum alloys; thermodynamic calculations; solidification; homogenization; phase diagrams 收稿日期: 2014--09--16 基金项目: 中央高校基本科研业务费专项资金资助项目( FＲF--TD--12--001) ; 国家高技术研究发展计划资助项目( 2013AA032403) DOI: 10． 13374 /j． issn1001--053x． 2014． 11． 016; http: / /journals． ustb． edu． cn Al--Zn--Mg--Cu 合金因具有高比强度、较好的耐 腐蚀和疲劳性能而被广泛用于航空航天领域，如 7075、7050 和 7055 高强铝合金． 然而，随着新一代 大飞机的发展，这些合金由于淬火敏感性相对较高