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Formation and properties of ta-y2o3, ta-zro2 and Ta TAC Nanocomposites

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Document pages: 12 pages

Abstract: Nanocrystalline tantalum ceramic composites were prepared by mechanical alloying and pulsed plasma sintering. Tantalum was used as the matrix, in which ceramic reinforcing phases with concentrations of 5, 10, 20 and 40 wt. were introduced. Oxides (Y2O3 and ZrO2) and carbides (TAC) are used as ceramic phases. Mechanical alloying leads to the formation of nanocrystals. Subsequent hot pressing in PPS mode leads to powder consolidation and formation of bulk nanocomposites. The average grain size of all bulk composites is 40   nm to 100   nm. In contrast, the average grain size of bulk nanocrystalline pure tantalum is about 170 nm   nm. The ceramic phase refined the grain size of TA nanocomposites. machinistcal properties were studied using the nanoindentation tests. The nanocomposites exhibit uniform load-displacement curves indicating good integrity and homogeneity of the samples. Out of the investigated components, the Ta-10 wt. TaC one has the highest hardness and a very high Young’s modulus (1398 HV and 336 GPa, resp.). For the Ta-oxide composites, Ta-20 wt. Y2O3 has the highest mechanical properties (1165 HV hardness and 231 GPa Young’s modulus).

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