Inhibiting segregation enabled outstanding combination of mechanical and corrosion properties in precipitation-strengthened aluminum alloys

作     者：Fang Li Geng Chen Sijun Chen Changjun Zhu Kanghua Chen Fang Li;Geng Chen;Sijun Chen;Changjun Zhu;Kanghua Chen

作者机构：Powder Metallurgy Research InstituteCentral South UniversityChangsha 410083China Light Alloy Research InstituteCentral South UniversityChangsha 410083China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2024年第179卷第12期

页      面：240-250页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financial support of National Key Research and Development Program of China(No.2021YFF0600504) State Key Laboratory of High-Performance Complex Manufacturing of Central South University(No.ZZYJKT2020-03) 

主　　题：Precipitation-strengthened aluminum alloys Precipitate-free zone Grain boundary precipitation Mechanical properties Corrosion resistance 

摘      要：Segregation of solutes to grain boundary(GB)is the dominant restriction on enhancement of mechanical properties and corrosion resistance during aging in precipitation-strengthened aluminum ***,we innovatively introduce the cyclic deformation by the vibration during aging to eliminate the GB segre-gation,resulting in the formation of the narrow precipitate-free zone(PFZ)widths near the GB,as well as the fine and discontinuous grain boundary precipitations(GBPs).Compared with the traditional peak-aging,the 2014 aluminum alloy treated by thermal cooperative vibration aging(TCVA)exhibits a superb combination of impact toughness and corrosion resistance,and retains the strength and *** ad-dition,the atomic simulations show that TCVA generates numerous vacancies near the GB,but does not change the dislocation density with the increase of cycle *** results indicate that the vacancy significantly promotes the nucleation and growth of precipitates in the vicinity of GB,resulting in the narrow PFZs and fine discontinuous *** present work provides the fundamental knowledge and method to inhibit the equilibrium segregation of solutes to GB during aging,and further realizes the precipitation-strengthened aluminum alloys with excellent mechanical and corrosion properties.