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采用原位反应法制备出不同颗粒含量的TiB_2/ZA27复合材料,研究了TiB_2颗粒含量对TiB_2/ZA27复合材料组织及性能的影响。结果表明,TiB_2/ZA27复合材料主要由α-Al相、η-Zn相、ε-CuZn_4相和TiB_2粒子组成,不存在明显的Al_3Ti和AlB_2相;原位生成的TiB_2颗粒对α-Al相产生明显的细化效果,为η-Zn相提供了更多的形核基底,使其晶粒细化、数量增加,在基体中的分布形态改变。随TiB_2颗粒含量的增加,α-Al相和η-Zn相的尺寸减小,α+η共析组织数量增加,材料的强度和硬度得到显著提高。
The in-situ reaction method was used to prepare TiB 2 / ZA27 composites with different particle contents. The effects of TiB 2 content on the microstructure and properties of TiB 2 / ZA27 composites were studied. The results show that TiB 2 / ZA27 composites consist mainly of α-Al phase, η-Zn phase, ε-CuZn 4 phase and TiB 2 particles. There are no obvious Al 3 Ti and AlB 2 phases. TiB 2 particles generated in situ generate α-Al phase The obvious refinement effect provides more nucleation base for the η-Zn phase, which leads to the grain refinement and the increase of the number. The morphology of the distribution changes in the matrix. As the content of TiB 2 particles increases, the size of α-Al phase and η-Zn phase decreases, and the number of α + η eutectoid structure increases, and the strength and hardness of the material increase significantly.