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对球磨后的粉末在1350°C保温2 h进行反应烧结,制备Ti-45Al-10Nb合金。对烧结坯料的显微组织,尤其对相组成,晶粒尺寸及颗粒的分布进行细致研究。结果表明,在此烧结条件下,材料的显微组织主要由Ti2Al C颗粒强化的双相γ+α2组织组成,相对于传统Ti Al基合金,该合金呈现出细小、均匀的显微组织。在细晶区,γ相和α2相的平均晶粒尺寸分别为(2.3±0.05)和(5.6±0.05)μm。此外,合金中存在大量位错,且γ相中的位错密度远高于α2相中的位错密度,对位错形成机理进行分析。
The ball-milled powder was incubated at 1350 ° C. for 2 h to prepare a Ti-45Al-10Nb alloy. The microstructure of the sintered billet, in particular, phase composition, grain size and particle distribution for careful study. The results show that under the sintering conditions, the microstructure of the material is mainly composed of Ti2AlC particles strengthened dual phase γ + α2 microstructure, showing a small, uniform microstructure compared with the conventional TiAl-based alloy. In the fine grain region, the average grain sizes of γ phase and α2 phase were (2.3 ± 0.05) and (5.6 ± 0.05) μm, respectively. In addition, a large number of dislocations exist in the alloy, and the dislocation density in the γ phase is much higher than that in the α2 phase, and the dislocation formation mechanism is analyzed.