Effects of in-situZrB_2 nanoparticles and scandium on microstructure and mechanical property of 7N01 aluminum alloy  

作　　者：Xizhou Kai Yuhui Wang Ruikun Chen Yanjie Peng Anjun Shi Ran Tao Xiangfeng Liang Guirong Li Gang Chen Xiaojing Xu Yutao Zhao 

机构地区：[1]School of Material Science and Engineering,Jiangsu University,Zhenjiang,212013,China [2]Institute for Advanced Manufacturing and Modern Equipment Technology,Jiangsu University,Zhenjiang,212013,China

出　　处：《Journal of Rare Earths》2024年第3期612-620,I0007,共10页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(U20A20274,52071158,51701085,U1664254);the Six Talents Peak Project of Jiangsu Province(2018-XCL-202);the Open Funds of SKLMMC of SJTU(MMC-KF18-16);the Jiangsu Province Key Laboratory of High-end Structural Materials(HSM1803,1902)。

摘　　要：In this study, the in-situ synthesized ZrB_(2) nanoparticles and rare earth Sc were introduced to enhance the strength and ductility of 7N01 aluminum alloy, via the generation of high-melting and uniform nanodispersoids. The microstructure and mechanical property evolution of the prepared composites and the interaction between ZrB_(2) and Sc were studied in detail. The microstructure investigation shows that the introduction of rare earth scandium(Sc) can promote the distribution of ZrB_(2) nanoparticles, by improving their wettability to the Al melt. Meanwhile, the addition of rare earth Sc also modifies the coarse Al Zn Mg Mn Fe precipitated phases, refines the matrix grains and generates high-melting Al_3(Sc,Zr)/Al_3Sc nanodispersoids. Tensile tests of the composites show that with the combinatorial introduction of ZrB_(2) and Sc, the strength and ductility of the composites are improved simultaneously compared with the corresponding 7N01 alloy, ZrB_(2) /7N01 composite and Sc/7N01 alloy. And the optimum contents of ZrB_(2) and Sc are 3 wt% and 0.2 wt% in this study. The yield strength, ultimate strength and elongation of(3 wt% ZrB_(2) +0.2 wt% Sc)/7N01 composite are 477 MPa, 506 MPa and 9.8%, increased about 18.1%, 12.2%and 38% compared to 7N01 alloy. Furthermore, the cooperation strengthening mechanisms of ZrB_(2) and Sc are also discussed.

关 键 词：7N01 aluminum alloy In-situ ZrB_(2)nanoparticles Rare earth Sc Microstructure Mechanical property Mechanism 

分 类 号：TG146.21[一般工业技术—材料科学与工程]