Mechanical properties,corrosion behavior and microstructure evolution of zinc and scandium co-strengthened 5xxx alloy

作     者：Yanlin Pan Yue Xu Di Zhang Jishan Zhang Guxin Zhou Yujing Lang Yanlin Pan;Yue Xu;Di Zhang;Jishan Zhang;Guxin Zhou;Yujing Lang

作者机构：China Academy of Ordnance Science Ningbo BranchNingbo315103China State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing100083China 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2023年第41卷第11期

页      面：1819-1826,I0006页

核心收录：

学科分类：08[工学] 0806[工学-冶金工程] 0804[工学-仪器科学与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：Project supported by the National Natural Science Foundation of China (51971019 51571013)。 

主　　题：Al-Mg-Zn Scandium Mechanical properties Intergranular corrosion Transmission electron microscopy(TEM) Rare earths 

摘      要：Nowadays,it is a challenge to improve the strength of 5xxx aluminium alloy while maintaining its distinctive properties.To address this,the Zn and Sc modified high strength 5xxx aluminium alloys with good intergranular corrosion resistance were prepared through chill casting,and the effects of minor Sc on mechanical properties,corrosion behavior and microstructure evolution of Al-5.0Mg-3.0Zn alloys were systematically investigated.The results show that the Sc containing alloy has high number density and small size of intragranular precipitates,combined with the solid solution strengthening of Sc and the Al_(3)(Sc_(1-x),Zr_(x))second phase strengthening,the strength of Al-5.0Mg-3.0Zn-0.1Sc alloy is obviously enhanced.Meanwhile,the intergranular corrosion resistance of the Sc containing alloy is also improved due to the formation of a large number of low angle grain boundaries and the weakening of the continuity of precipitated phases along the grain boundaries.