Solute concentrations and stresses in nanograined H-Pd solid solution

Hang Ren, Xusheng Yang, Yao Gao, Tong Yi Zhang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

8 Citations (Scopus)

Abstract

In the present work, we applied the Gibbs-approach-based adsorption isotherm for nanograined polycrystals to H-Pd solid solutions. Using the published experimental data of lattice strain and sample strain of the nanograined Pd, with an average grain size of 10 nm and in thermodynamic equilibrium with an H2partial pressure, we determined H concentrations and stresses, as a function of the H2partial pressure, in both grains and grain boundaries. More importantly, we determined the intrinsic properties of grain boundaries, such as the grain boundary bulk modulus, the grain boundary excess thickness, and the difference in chemical potential between grains and grain boundaries. With the determined intrinsic properties, the Gibbs-approach-based adsorption isotherm predicted the segregation of H in grain boundaries of nanograined Pd with an average grain size of 5 nm. The predication was verified by other reported experimental data.
Original languageEnglish
Pages (from-to)5487-5495
Number of pages9
JournalActa Materialia
Volume61
Issue number14
DOIs
Publication statusPublished - 1 Jan 2013
Externally publishedYes

Keywords

  • Concentration
  • Nanograined materials
  • Palladium-hydrogen
  • Stress

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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