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The influence of Nb powder sizes and morphologies (equiaxed and flaky powders) on fracture behaviour of the Nb-16Si alloy and a Nb-16Si-22Ti-2Al-2Hf-7Cr alloy with a Nb/Nb5Si3 microstructure fabricated via spark plasma sintering (SPS) was investigated. A decrease in the Nb powder size from 78.8μm to 4.9μm led to a fine-grain (9.9μm) Nb matrix plus a Nb5Si3 island microstructure, which changed fracture...
The microstructure, deformation and fracture behaviour of a Nb-20Si-24Ti-2Al-2Cr alloy with a ductile/stiffening NbSS/Nb5Si3 structure prepared by spark plasma sintering (SPS) and arc melting (AM) techniques were investigated. An ultra-fine NbSS/Nb5Si3 microstructure, approximately ~2μm in phase size, was obtained when this Nb-Si based alloy powder prepared by the plasma rotating electrode atomization...
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