Funct. Mater. 2025; 32 (4): 586-594.

doi:https://doi.org/10.15407/fm32.04.586

Features of phase and structure formation in a titanium matrix composites reinforced with a multicomponent alloy of the Ti-Fe-Mn-Si-C(B) system

O. Baranovska1, A. Bondar1, G. Bagliuk1, D. Baranovskiy1, Ye. Kyryliuk1, A. Ahapov2, O. Olifan1, S. Korichev1

1 Frantsevich Institute for Problems of Materials Science National Academy of Science of Ukraine, Kyiv
2Technical Center of the National Academy of Science of Ukraine, Ukraine, Kyiv

Abstract: 

The work is dedicated to the study of phase and structural evolution in titanium matrix composites reinforced with a pre-synthesized master alloy of the TiH2 – FeSiMn – B4C system. The composite was fabricated using powder metallurgy techniques, employing PTM-1 grade titanium powder and a pre-synthesized TiH2 - FeSiMn - B4C master alloy in varying weight percentages (10, 20, and 30 wt. %) followed by vacuum sintering at 1100 – 1200 °C. The influence of sintering temperature and master alloying element concentration on porosity, microstructure, phase composition, and microhardness was analyzed. The composites sintered at 1200 °C exhibited lower porosity and higher microhardness due to intensified diffusion processes. SEM, XRD, and microprobe analysis confirmed the availability of reinforcing phases such as TiB, TiC0.5, and Ti5Si3B, and revealed a clear dependence of phase morphology and grain structure on the master alloy content. Microhardness increased with increasing reinforcement content and sintering temperature, reaching peak values of up to 12 GPa in regions enriched with high-modulus compounds in the composite with 30 wt.% master alloy.

Keywords: 
Titanium matrix composites, powder metallurgy, master alloy, high-modulus reinforcements, microstructure, α-Ti, β-Ti

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