Abstract
Tungsten fiber-reinforced tungsten (Wf/W) composites are a promising plasma-facing material, and the microstructure at the interface between W fibers and the W matrix greatly impacts performance. In this study, a new kind of Wf/W-Y2O3 composites was developed with the addition of Y2O3 particles to the W matrix in order to modify the interface microstructure between W fibers and the matrix. The microstructure and mechanical properties of these composites were investigated through sintering at temperatures ranging from 1500 °C to 1800 °C. The Y2O3 particles with a face-centered cubic crystal structure were formed at the interface between W fibers and the matrix, which is beneficial for weakening the bonding strength. The Wf/W-Y2O3 composites exhibited pseudo-plasticity at low sintering temperatures, which show the highest bending strength (261 MPa) and fracture energy (6.66 KJ/m2) at 1600 °C. The grains in W particles become the recrystallized nuclei on the surface of W fiber through the bonding of W powder and W fibers. Then, these recrystallized nuclei grow into W fibers by migration of bonding boundaries. However, the Y2O3 particles in the W powder can inhibit the migration of grain boundaries, thereby suppressing the abnormal grain growth behavior at the surface of W fiber.
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