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  • Room temperature and high-t...
    Bahador, Abdollah; Yurtsever, Ayhan; Amrin, Astuty; Kariya, Shota; Umeda, Junko; Shen, Jianghua; Chen, Biao; Fukuma, Takeshi; Kondoh, Katsuyoshi

    Materials & design, August 2022, 2022-08-00, 2022-08-01, Letnik: 220
    Journal Article

    Display omitted •Novel Ti-4Fe-3W/2TiC composite utilizing spark plasma sintering and hot extrusion.•Extruded composite at α+β exhibited yield strength of 1215 MPa at room temperature.•Extruded composite at β showed a consistent strength at high temperatures.•TiC dispersion was identical, while α morphology of the alloy matrixes was different. Considering the high strength of titanium matrix composites (TMCs) at room and elevated temperatures, the aim of this study was to develop novel TMC Ti-4Fe-3W/2TiC (wt%) utilizing powder metallurgy and subsequent extrusion at different temperatures: the two-phase (α+β) and pure β phase regions. The TiC particle dispersion was almost identical in both composites with variation in the size distribution. However, there was a significant difference in the morphology of the α phase in the matrix. The α+β-extruded composite exhibited globular αp (grain size: 0.7 μm); in contrast, the β-extruded phase showed acicular αs (grain size: 1.5 μm). Additionally, α-Ti was the predominant phase in contact with TiC particles due to the semi-coherent relationship between these two phases. A remarkably high yield strength (1215 MPa) was achieved at room temperature in the α+β -extruded composite, while the β-extruded composite exhibited consistently improved strength at high temperatures. Morphological characterization using atomic force microscopy (AFM) revealed the β phase was slightly harder than the α phase, probably due to the solid solution of Fe and W that predominant in the β phase.