摘要
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。
TiB2/ZA27 composite with different TiB2 particle content was synthesized by in-situ reaction. The effects of TiB2 particle content on the microstructure and mechanical properties of the composite were investigated. The results show that TiB2/ZA27 composite is composed of a-Al phase, η-Zn phase, 8-Cu7n4 phase and TiB2 particle, and there is no obvious Al3Ti and AlB2 phase appearing in the matrix. The in-situ TiB2 particles generate obvious refinement effect for a-Al phase, which can provide effective heterogeneity nucleation substratum for η-Zn phase and make grain size refine and number increase, and then, the distribution in the matrix changes. With the increase of TiB2 particles content, the sizes of a-Al phase and η-Zn phase decrease while the amount of a＋η eutectoid structure increases, then, the strength and hardness of the alloy obviously improve.
出处
《热加工工艺》
CSCD
北大核心
2016年第16期84-88,共5页
Hot Working Technology
基金
长沙市科技计划项目(K1406033-11)
