Abstract In this paper, Fe3Al (Fe–23Al–3Cr) alloys reinforced with in-situ TiC precipitates were fabricated using a combination of high-energy ball milling and vacuum hot-pressing sintering technology. The experiment found that the 1 × 10−3 Pa vacuum was the optimal preparation conditions of composites. The results show that in-situ TiC ceramic is an efficient method to improve the mechanical properties of Fe3Al/TiC composites. The hardness and compressive strength of the composite significant increases with in-situ TiC. And note that in-situ 50% TiC composite has the highest compressive strength (2572 MPa). By comparison, the compressive strength and hardness of all the in-situ composites (15%–50%) are not much different from that of the same contents of ex-situ TiC composites. The bending strength decrease with in-situ TiC content increase except that of in-situ 15%TiC composite, and it exhibits the highest bending strength (1941 MPa). In addition, the fracture toughness of the composites decreases significantly with increasing TiC content. The main reason is that the brittle ceramic TiC particles could act as obstacles for the ductility of Fe3Al alloys. The bending fracture mode transforms from tough fracture mode to brittle cleavage facets crack mode.

中文翻译：

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机械合金化和真空热压烧结技术原位TiC增强Fe3Al(Fe-23Al-3Cr)基复合材料的显微组织和力学行为

摘要 本文结合高能球磨和真空热压烧结技术制备了原位 TiC 沉淀增强的 Fe3Al (Fe-23Al-3Cr) 合金。实验发现1×10-3 Pa真空是复合材料的最佳制备条件。结果表明，原位TiC陶瓷是提高Fe3Al/TiC复合材料力学性能的有效方法。复合材料的硬度和抗压强度随着原位 TiC 显着增加。并注意原位 50% TiC 复合材料具有最高的抗压强度 (2572 MPa)。相比之下，所有原位复合材料（15%~50%）的抗压强度和硬度与相同含量的非原位 TiC 复合材料的抗压强度和硬度相差不大。除原位 15%TiC 复合材料外，抗弯强度随原位 TiC 含量的增加而降低，并表现出最高的抗弯强度（1941 MPa）。此外，复合材料的断裂韧性随着 TiC 含量的增加而显着降低。主要原因是脆性陶瓷 TiC 颗粒可能成为 Fe3Al 合金延展性的障碍。弯曲断裂模式从坚韧断裂模式转变为脆性解理面裂纹模式。