Hydrogen diffusion in nanocrystalline nickel indicating a structural change within the grain boundaries after annealing
- Univ. Goettingen (Germany). Inst. fuer Metallphysik
As a consequence of the enlarged solubility and diffusivity H-permeation occurs predominantly via grain boundaries in nanocrystalline Ni at room temperature. Annealing the corresponding Ni-samples at 1,000 C leads to considerable grain growth and most of the H-permeation takes place through the grains. In the present study the authors report on measurements of hydrogen diffusivity and permeability in nanocrystalline Ni-samples which were annealed at temperatures between 200 and 800 C. The authors determined grain growth for the various annealing temperatures, too, in order to demonstrate that the change from grain boundary transport to bulk transport is due to a structural change within the network of grain boundaries and not due to a decrease in the area density of boundaries.
- OSTI ID:
- 540903
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 8 Vol. 37; ISSN 1359-6462; ISSN SCMAF7
- Country of Publication:
- United States
- Language:
- English
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