Abstract
Multiprincipal alloys with better high temperature properties and irradiation resistance are being explored as potential candidates for nuclear applications. This work is aimed at investigating the effect of Nb addition on the phase stability of CrFeMoV alloy. Microstructure of the as cast CrFeMoNbV alloy showed a dendritic morphology. Microsegregation in the cast alloy has been understood on the basis of partition coefficient and difference in melting point of the constituent elements. Structural analysis through Precession Electron Diffraction (PED) and 3D Automated Diffraction Tomography (ADT-3D) showed the formation of HCP intermetallic Laves phase of Fe2Nb type in a BCC matrix. The formation of this dual phase structure has been understood through in depth empirical calculations and CALPHAD simulations. Addition of Nb is shown not only to increase the lattice strain through increase in atomic size difference, but also increases the enthalpy contribution, which favors the formation of intermetallic Laves phase.
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