Diffusion and segregation of niobium in fcc-nickel - Archive ouverte HAL Access content directly
Journal Articles Journal of Physics: Condensed Matter Year : 2012

Diffusion and segregation of niobium in fcc-nickel

Abstract

Niobium is one of the major alloying elements, among the refractory elements, contributing to the strengthening of superalloys. Consequently, data about its behavior and its migration mechanism in fcc-Ni are essential knowledge to understand and control the strengthening in such alloys. We present in this work Nb interactions, solubility and diffusion in Ni performed by using the GGA approximation of the density functional theory. The substituted site is found to be the most favorable configuration in comparison to the tetrahedral and octahedral sites. The effect of temperature on solubility is discussed taking into account the thermal expansion of the lattice parameter and the vibrational contribution. Its diffusion mechanism is also discussed and compared to the literature. We finally discuss the segregation of Nb atoms on a 65-(012) symmetric tilt grain boundary.

Keywords

Fichier principal
Vignette du fichier
connetable_14070.pdf (643.65 Ko) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-01170517 , version 1 (01-07-2015)

Identifiers

Cite

Damien Connétable, Benoît Ter-Ovanessian, Eric Andrieu. Diffusion and segregation of niobium in fcc-nickel. Journal of Physics: Condensed Matter, 2012, vol. 24 (n° 9), pp. 1-5. ⟨10.1088/0953-8984/24/9/095010⟩. ⟨hal-01170517⟩
57 View
696 Download

Altmetric

Share

Gmail Facebook X LinkedIn More