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用真空水冷铜坩埚感应熔炼炉离心浇注工艺和熔模精密铸造技术,制备Nb丝增韧Ti Al/Ti5Si3(Ti-40Al-5Si)基复合材料,对其进行真空退火处理。通过SEM、万能试验机等测试复合材料的显微结构、冲击性能、抗弯性能以及界面层显微硬度的分布情况。结果表明:Nb丝与基体结合良好,复合材料界面层组织为σ相、γ相及T2相,复合材料冲击性能较Ti Al/Ti5Si3基体有较大的提高,抗弯强度较基体下降但Nb丝延缓了其断裂;退火处理后,复合材料界面反应层中合金元素分布更加均匀,显微硬度及冲击性能比铸态时分别增加约7.8%、22.87%。
The Ti wire toughening Ti Al / Ti5Si3 (Ti-40Al-5Si) matrix composites were prepared by centrifugal casting process with vacuum water-cooled copper crucible induction melting furnace and investment precision casting technology, and then annealed in vacuum. The microstructure, impact properties, flexural properties and micro-hardness distribution of the interface layer were tested by SEM and universal testing machine. The results show that Nb wirebonded well with the matrix. The interfacial microstructure of the composites is σ phase, γ phase and T2 phase. The impact properties of the composite are better than that of Ti Al / Ti5Si3 matrix, but the flexural strength is lower than that of matrix Delayed the fracture. After annealing, the alloying elements in the interface layer of the composite material were more evenly distributed, and the microhardness and impact properties increased by about 7.8% and 22.87%, respectively.