Microstructure evolution of Al-5wt. %Cu based alloy under compound Strengthening

2018 4th International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Li, Min^1 ; Cai, Lanrong^1 ; Liu, Shijie^1

Key Laboratory of Tianjin High Speed Cutting and Precision Machining, Tianjing University of Technology and Education, Tianjin

300222, China^1

关键词: Al-5wt.%Cu based alloys;    Grain size;    Hexagonal lattice;    Micro-structure evolutions;    Partial remelting;    Quantitative metallography;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/252/2/022122/pdf
DOI  :  10.1088/1755-1315/252/2/022122

来源: IOP

【 摘 要 】

The effects of yttrium(Y) additions (0, 0.05, and 0.1wt. %) and partial remelting treatment on microstructure, grain size, phase composition of Al-5wt. %Cu based alloy were investigated in the present work. The microstructure and phase composition of samples were examined by optical microscopy (OM), scanning electron microscopy (SEM), and transmission electron microscope (TEM). We demonstrate that the AlCuY phase which had hexagonal lattice structure was precipitated by adding Y. Especially, Y+ returns refines the grain size, decreases the quantity of eutectic on grain boundaries, and narrows the crystallization range. Quantitative metallography shows that the grain size is reduced to about 25μm for alloys with 0.1 wt. %Y+20wt. %R.