Coarsening kinetics and strengthening mechanisms of core-shell nanoscale precipitates in Al-Li-Yb-Er-Sc-Zr alloy  

作　　者：Yang Wang Shun Zhang Ruizhi Wu Nodir Turakhodjaev Legan Hou Jinghuai Zhang Sergey Betsofen 

机构地区：[1]Key Laboratory of Superlight Materials&1 Surface Technology,Ministry of Education,Harbin Engineering University,Harbin 150001,China [2]College of Science,Heihe University,Heihe 164300,China [3]Department of Machine Building,Tashkent State Technical University,Tashkent 100056,Uzbekistan [4]Moscow Aviation Institute,National Research University,Moscow 109383,Russia

出　　处：《Journal of Materials Science & Technology》2021年第2期197-203,共7页材料科学技术（英文版）

基　　金：supported financially by the National Natural Science Foundation of China(Nos.51671063,51771060,51871068 and 51971071);the Domain Foundation of Equipment Advance Research of 13th Five-year Plan(No.61409220118);the Fundamental Research Funds for the Central Universities(No.HEUCFG201834);the Harbin City Application Technology Research and Development Project(Nos.2015RQXXJ001 and 2017RAQXJ032);the Ph.D.Student Research and Innovation Fund of the Fundamental Research Funds for the Central Universities(No.3072019GIP1013)。

摘　　要：The tailored nanoparticles with a complex core/shell structure can satisfy a variety of demands, such as lattice misfit, shearability and coarsening resistance. In this research, core-shell nanoscale Al3(Yb, Er, Sc,Zr, Li) composite particles were precipitated in Al-2 Li-0.1 Yb-0.1 Er-0.1 Sc-0.1 Zr(wt%) alloy through the double-aging treatment, in which the core was(Yb, Er, Sc, Zr)-rich formed at 300°C and the shell was Li-rich formed at 150°C. The coarsening kinetics and precipitate size distributions(PSDs) of Al3(Yb, Er, Sc,Zr, Li) particles aged at 150°C previously aged at 300°C for 24 h showed a better fit to the relation of 2∝ kt and normal distribution, indicating that the coarsening of precipitates was controlled by interface reaction, not diffusion. The Orowan bypass strengthening was operative mechanism at 150°C.

关 键 词：Al-Li alloys Aging Core-shell structure Coarsening kinetics Strengthening mechanisms 

分 类 号：TG146.21[一般工业技术—材料科学与工程]