Effect of Y on Microstructure and Properties of TiB2/Al–Zn–Mg–Cu–Zr
MA Zhifeng1,2, LIU Xing1,2, HUANG Jingcun3, HAN Yang3, WANG Yuxin3, LI Meng3, CHEN Ziyong3
(1. Institute of Aluminum Alloy, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China;
2. Beijing Engineering Research Center of Advanced Aluminum Alloys and Applications, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China;
3. Materials and Manufacturing Department of Beijing University of Technology, Beijing 100124, China
Rare earth Y has excellent refining effect on TiB2 particle reinforced composites, and can improve the performance damage caused by TiB2 particle clusters. It plays an important role in improving the comprehensive mechanical properties of composites. In this paper, 3% (mass fraction) TiB2/Al–Zn–Mg–Cu–Zr–Y composite plates were prepared by traditional casting and hot extrusion. The effects of Y content on the microstructure and mechanical properties of TiB2–reinforced aluminum matrix composites were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and tensile test at room temperature. The results show that the as-cast microstructure of composites can be refined by addition of Y, and the refining effect is the best when 0.1% Y (mass fraction) is added. The composite with 0.1% Y (mass fraction) has the best mechanical properties, with the ultimate tensile strength (UTS) of 729.85 MPa and the elongation (EL) of 8.06%. The addition of Y element leads to the formation of insoluble phase Al8Cu4Y(Zr) at the grain boundary, which can be broken and strengthened by hot extrusion. Excessive Al8Cu4Y(Zr) leads to the decrease of strength and plasticity of the material. TiB2 particles can increase the dislocation density in the matrix, and have the effect of dislocation strengthening and load transfer strengthening. GP II and η′ are the main nano-strengthening phases in the T6 state of the composites.
马志锋，刘行，黄景存，韩杨，王屿鑫，李萌，陈子勇. 稀土Y对TiB2/Al–Zn–Mg–Cu–Zr微观组织与性能的影响[J]. 航空制造技术, 2023, 66(23/24): 94-99.
MA Zhifeng, LIU Xing, HUANG Jingcun, HAN Yang, WANG Yuxin, LI Meng, CHEN Ziyong. Effect of Y on Microstructure and Properties of TiB2/Al–Zn–Mg–Cu–Zr[J]. Aeronautical Manufacturing Technology, 2023, 66(23/24): 94-99.
2023, 
