Effects of boron on water dissociation and surface diffusivity of hydrogen on Ni3(Al,Ti)(110) single crystal surfaces

J. Wang, Y. W. Chung*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

The interaction between water vapor (D2O) and boron-modified Ni3(Al,Ti)(110) was investigated using temperature-programmed desorption and X-ray photoelectron spectroscopy. Boron dosing was performed using a solid-state boron ion source. Results showed that boron reacts with water to form hydroxyls at temperatures as low as 130 K. D2 desorption occurs at ∼950 K from boron-modified Ni3(Al,Ti)(110), indicating strong B-D bonding. Surface diffusion coefficients of atomic D, obtained from dissociation of water, on clean and boron-modified Ni3(Al,Ti)(110) surfaces were measured at 270 K with electron-stimulated desorption. The surface diffusion coefficient of atomic D on 0.05 monolayer boron-modified surface is about 10 times smaller than that on the boron-free surface. This slower diffusion of atomic hydrogen may explain why boron improves the ductility of polycrystalline Ni3Al in moist environments.

Original languageEnglish (US)
Pages (from-to)349-354
Number of pages6
JournalIntermetallics
Volume9
Issue number4
DOIs
StatePublished - Apr 2001

Keywords

  • A. Nickel aluminides, based on NiAl
  • B. Brittleness and ductility
  • B. Diffusion
  • B. Environmental embrittlement
  • B. Surface properties

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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