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- W2079246271 abstract "Vanadium alloyed C15 Laves phase based on NbCr2 and phase equilibria in the Nb–Cr–V system have been studied, focusing on the physical metallurgy and defect structures of the C15 phase. Based on the Nb–Cr–V phase diagram established in this work, the defect structure/mechanism in the ternary C15 Laves phase is investigated using a combination of metallography, SEM/EDS, TEM/ALCHEMI, and X-ray powder diffraction. It is found that the C15 phase field of NbCr2 is extended by V alloying up to more than 30 at.% V and V substitutes exclusively on the Cr site instead of the Nb site, although the atomic sizes of the constituent elements indicate rCr<rV<rNb. The lattice constants of the ternary C15 phase Nb(Cr,V)2 increase linearly with increasing V content. The electronic structure and total energy of the C15 intermetallic phase NbCr2 have been calculated using the linear muffin tin orbital (LMTO) method with the atomic sphere approximation (ASA). The electronic band structure and density of electronic states were obtained. The formation and stability of the ternary C15 Laves phase Nb(Cr,V)2, the defect structure/mechanism, and the compositional dependence of the lattice constants are elucidated using a combination of geometric and electronic considerations. These results indicate that the electronic factor may also play an important role, in addition to the atomic size rule, in determining the alloying behavior and the defect structure/mechanism of C15 Laves phases based on NbCr2." @default.
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- W2079246271 date "1998-03-01" @default.
- W2079246271 modified "2023-10-06" @default.
- W2079246271 title "Phase stability and defect structure of the C15 laves phase Nb(Cr,V)2" @default.
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- W2079246271 doi "https://doi.org/10.1016/s1359-6454(97)00291-7" @default.
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