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Pressureless sintering and characterization of ▫$B_4C$▫, TiC and ▫$TiB_2$▫-particle-reinforced ▫$TiAl_3$▫ matrix composites = Sintranje in karakterizacija kompozitov na osnovi ▫$TiAl_3$▫, ojačanih z delci ▫$B_4C$▫, TiC in ▫$TiB_2$▫
Kevorkijan, Varužan ; Škapin, Srečo D.
Dense (>95% of theoretical density) TiAl3-based composites reinforced with 10-50 vol. % of B4C or TiC and 10-30 vol.% of TiB2 particles were successfully prepared by combining pressureless reaction ...synthesis and reaction sintering. The first step was formation of TiAl3 from the elemental powders by reaction between solid Ti and liquid Al (at 800 °C/1h and 1250 °C/3h in a static atmosphere of Ar with 4 vol. % H2). The reaction product obtained with a nominal composition of 88 vol. %TiAl3-10 vol. %Al-2 vol. % Ti, was milled and subsequently blended with the ceramic powders. The green compacts made from the blended powder mixture were reaction sintered at 1300 °C for 2 h in an Ar+4 vol. % H2-rich environment using a vacuum furnace. The morphology of the TiAl3 powders and the microstructure of the as-sintered composites were studied by scanning electron microscopy and X-ray diffraction analysis. The mechanical properties were measured by tensile tests performed at room temperature. In the case of reactive systems (TiAl3-B4C and TiAl3-TiC), densification proceeds via formation of various secondary bonding phases, whilst in non-reactive system (TiAl3-TiB2) the process seems to proceed by infiltration of molten aluminium into pores. In this respect, densification of TiAl3-TiB2 samples with more than 30 vol. % of ceramic particles was incomplete. Regarding the room temperature tensile properties of the composites, superior improvement was observed in TiAl3-B4C and TiAl3-TiCsamples with 50 vol. % of ceramic particles. However, in TiAl3-TiB2 samples the improvement was significantly lower due to the lack of chemical affinity (wetting) between ceramic reinforcement and TiAl3 matrix.
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