Verification of the generalised chemical potential for stress-driven hydrogen diffusion in nickel

A. Drexler*, S. He, V. Razumovskiy, L. Romaner, W. Ecker, R. Pippan

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Hydrogen embrittlement leads to time-dependent failure of structural components. Hydrogen absorption and diffusion contribute to the time dependency and are often treated by thermodynamic diffusion models, which consider the ideal-solution approach and spherical distortion of the lattice. The interaction of spherical lattice distortions with hydrostatic stress fields causes stress-driven hydrogen diffusion. In the present work, ab-initio calculations are used to verify and parametrise the stress dependency of the generalised chemical potential for hydrogen in nickel. Therefore, the partial molar volume for hydrogen in nickel is introduced. The assumption of linear elasticity and a linear dependency on the hydrostatic stress is sufficient to describe hydrogen diffusion on the macroscopic and mesoscopic scale. The work is concluded with hydrogen diffusion simulations, which reveal a minor influence of stress-driven hydrogen diffusion on the overall hydrogen distribution in nickel.
Original languageEnglish
Pages (from-to)513-523
Number of pages11
JournalPhilosophical Magazine / Letters
Volume100
Issue number11
DOIs
Publication statusPublished - 1 Nov 2020
Externally publishedYes

Keywords

  • DFT calculations
  • Hydrogen diffusion
  • hydrogen embrittlement
  • nickel
  • thermodynamic modelling

ASJC Scopus subject areas

  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Verification of the generalised chemical potential for stress-driven hydrogen diffusion in nickel'. Together they form a unique fingerprint.

Cite this