Ajenifuja, EmmanuelPopoola, Abimbola PatriciaPopoola, Olawale2024-08-052024-08-052024-07-090268-3768 (P)1433-3015 (E)https://hdl.handle.net/20.500.14519/461Cobalt-based ternary superalloys were prepared from the consolidation of high purity cobalt, tungsten and tantalum elemental powder using spark plasma sintering technique. The composition of the alloys was fixed, so also were the sintering pressure (50 MPa) and heating rate (150 °C/min). However, the samples sintering temperatures were varied from 800 to 1400 °C, with holding time of 10 and 15 min. The microstructure, phase and crystallographic characterizations were done using scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDS), optical microscopy and X-ray diffraction spectroscopy. Mechanical properties of the Co-alloys were evaluated using Vickers microhardness analytical data. Sintering data analysis indicates a two-step major and minor densification modes in the samples, and morphological images show evolution in the microstructure based on varied sintering parameters. Phase partitioning due to spinodal decomposition was observed in the alloys (1000 to 1400 °C). Crystallographic peak intensities were observed to increase with sintering temperature up to 1200 °C, whereas structural amorphization occur at 1400 °C. The microhardness improved from 358.74 to 594.64 HV for sintered alloy at 1200 °C. Alloy samples sintered at 1200 °C and of 10 min dwelling time have optimum mechanical property.enAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/Co-w-taTernary alloysSpinodal decompositionSpark plasma sinteringMicrostructureMicrohardnessArticle