Abstract
Laves-phase intermetallics are of potential interest for use as high temperature structural materials, of which NbCr2-based C15-structured Laves phases are particularly attractive. Vanadium-alloyed NbCr2 Laves phases have been studied. The defect mechanism of a ternary Laves phase is crucial to understanding its physical metallurgy and deformation behavior. It is suggested based on the Nb-Cr-V phase diagram and first-principles total energy and electronic structure calculations for NbCr2 that V should occupy the B sites in C15-structured AB2. In this paper, ALCHEMI is employed to examine this assumption for one composition of a V-alloyed NbCr2 Cl5 Laves phase.A Nb-Cr-V alloy of composition Nb33Cr42V25 was prepared by arc-melting followed by annealing at 1400°C for 120 h. Specimens were prepared for microanalysis by cutting 3 mm discs followed by dimpling and ion milling. Energy-dispersive X-ray (EDX) spectra were acquired with a Philips CM30 operating at 300 kV and equipped with a Kevex Quantum detector. Fourteen spectra were collected near <014> over a range of {400} excitations between symmetry and beyond {12 0 0}.
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Schedule a callMore From: Proceedings, annual meeting, Electron Microscopy Society of America
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