Mechanical properties and thermal stability of 7055 Al alloy by minor Sc addition

作     者：Chong-Yu Liu Guang-Biao Teng Zong-Yi Ma Li-Li Wei Wen-Biao Zhou Hong-Feng Huang Hai-Quan Qi Chong-Yu Liu;Guang-Biao Teng;Zong-Yi Ma;Li-Li Wei;Wen-Biao Zhou;Hong-Feng Huang;Hai-Quan Qi

作者机构：Key Laboratory of New Processing Technology for Nonferrous Metal and MaterialsMinistry of EducationGuilin University of TechnologyGuilin 541004China Shenyang National Laboratory for Materials ScienceInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016China Alnan Aluminium Co.LtdNanning 530000China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2020年第39卷第6期

页      面：725-732页

核心收录：

学科分类：08[工学] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0702[理学-物理学] 

基　　金：financially supported by the National Natural Science Foundation of China(No.51601045) the Research Program of Science and Technology of Guangxi(No.GKAB16380021) the Guangxi“Bagui”Teams for Innovation and Research。 

主　　题：Al alloy Sc addition Microstructure Mechanical properties 

摘      要：This study investigated the effect of 0.25 wt%Sc addition on the microstructure and mechanical properties of AA 7055 alloy.The addition of Sc obviously refined the grains of AA 7055 alloy during casting,homogenizing,rolling,solution,and aging treatments due to the formation of primary and precipitate Al3(Sc,Zr)phase.The recrystallization and precipitation of AA 7055 alloy were inhibited during heat treatments by Sc addition.The Sccontaining AA 7055 alloy exhibited higher thermal stability than AA 7055 alloy during homogenizing treatment,because of the grain boundary pinning effect of nano-sized Al3(Sc,Zr)particles.Given its structure characteristics such as fine grains,fineη′phase,and lessηphase,AA 7055 alloy with added Sc showed good mechanical properties after aging at 120℃for 24 h,with an ultimate tensile strength(UTS)of 679 MPa and elongation(EL)of 14%.This work provides an effective strategy to fabricate AlZn-Mg(-Cu)series(7 xxx)alloys with excellent mechanical properties.