【作者】 曾立英； 毛小南； 戚运莲； 张鹏省； 张廷杰；

【Author】 Zeng Liying, Mao Xiaonan, Qi Yunlian, Zhang Pengsheng, Zhang Tingjie ( Titanium Alloy Research Center, Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China)

【机构】 西北有色金属研究院钛合金研究所；

【摘要】 探讨了添加粒子的形态对熔铸法制备的TiC粒子增强钛基复合材料力学性能与显微组织的影响。研究采用的TiC粒子增强的钛基复合材料是用预处理熔炼法(PIMP)工艺制备的。将二次真空自耗电弧熔炼的铸锭用常规方法锻造成Φ13 mm左右的棒材,在其上切取拉伸试样和蠕变试样,在800-1050℃温度范围内热处理1 h,空冷。测试复合材料的室温和高温拉伸以及蠕变性能。研究结果表明。TiC粒子在基体分布均匀。添加尺寸为5 μn以下的球形或近似球形TiC粒子时,粒子增强的钛基复合材料的综合性能优异,具有良好的热强性与室沮塑性匹配,直至650℃,复合材料仍具有良好的综合机械性能。更多还原

【Abstract】 Microstructures and properties of titanium matrix composite were studied. TiC particle reinforced titanium matrix composite was prepared by pre-treat-ment melting process (PTMP). The ingot produced by non-consumable vacuum arc remelting (VAR) furnace was conventionally forged into Φ13 mm bar. The tensile specimens and creep samples were cut from the forged bar, and were annealed at 800 - 1050 ℃for 1 h. The mechanical properties and creep properties of the as-annealed composite were examined in air at room and elevated temperatures respectively. The results indicate that most of the reinforcing particles made by SHS method are of rectangle-like shape, sphere-like shape or bar-like shape. The sizes of the particles vary from 3 μm to over 10 μm. After being added into titanium matrix, most of the reinforcing particles are sphere-like shape or near sphere-like shape, and distribute evenly in the matrix. The average size for the particle is about 5μm. The composite has high strength at elevated temperature and good ductility at ambient temperature, which possess favorite comprehensive properties even at 650℃.更多还原