Abstract
Texture and crystallographic orientation relationships in arc-melted hypoeutectic and hypereutectic binary Nb-Si alloys are investigated. Electron backscattered diffraction (EBSD) is used here in conventional conditions, i.e., at relatively high spatial resolution (<1 µm) for ∼400×400 µm fields, as well as on very large fields (1.1×1.1 mm), at lower resolution, to get a statistical overview of the microstructure. In as-cast Nb-16Si and Nb-22Si alloys (compositions are in at. pct), [001]Nb3Si is found parallel to the local thermal gradient, with Nb3Si + Nb eutectic cells, giving rise to a microstructure similar to that obtained by directional solidification. In Nb-22Si alloy, the following orientation relationships between poles of metallic and silicide phases have been found: (111)Nb//(111)Nb3Si (as cast), (011)Nb//(011) α-Nb5Si3, and (111)Nb//(100) α-Nb5Si3 (heat treated at 1500 °C, 75 hours).
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This article is based on a presentation made in the symposium entitled “Beyond Nickel-Base Superalloys,” which took place March 14–18, 2004, at the TMS Spring meeting in Charlotte, NC, under the auspices of the SMD-Corrosion and Environmental Effects Committee, the SMD-High Temperature Alloys Committee, the SMD-Mechanical Behavior of Materials Committee, and the SMD-Refractory Metals Committee.
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Drawin, S., Boivin, D. & Petit, P. Microstructural properties of Nb-Si alloys investigated using EBSD at large and small scale. Metall Mater Trans A 36, 497–505 (2005). https://doi.org/10.1007/s11661-005-0163-7
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DOI: https://doi.org/10.1007/s11661-005-0163-7