Abstract
This study synthesized and characterized the Ti-48Al-2Cr-2 Nb-based composite reinforced by B4C addition, which was produced by spark plasma sintering. The grain size of composites decreased significantly from 225 ± 5 µm to 51 ± 5 µm with the increase of B4C content, mainly due to the pinning effect of in-situ generated TiB2 and Ti2AlC particles at grain boundaries, which limited the rapid grain growth of the matrix. With the addition of B4C, the volume fraction of Ti2AlC increased from 3.0% to 7.4%, with an average size of approximately 5 µm. The ultimate tensile strength and total fracture elongation of the Ti-48Al-2Cr-2 Nb alloy were 482.9 MPa and 10.2% at 800 ℃, correspondingly. With 0.3 wt% addition of B4C, B4C/Ti-48Al-2Cr-2 Nb composite exhibited superior strength (579.5 MPa) and ductility (12.6%) at the same tensile temperature. The reinforced strength of the composite was mainly attributed to the grain refinement and precipitation strengthening.
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