The role of hydrogen diffusion and desorption in moisture-induced embrittlement in intermetallics doped with alloying elements

Yanfeng Chen, Yip Wah Chung*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

A statistical model was developed to explain effects of alloying elements on moisture-induced embrittlement in intermetallics. This model shows that if alloying elements have strong binding to atomic hydrogen, they may suppress moisture-induced embrittlement by slowing hydrogen diffusion even at low alloying element concentrations. The concentration needed to effectively slow down the diffusion process decreases with temperature. Grain boundary segregation is not a necessary condition to suppress embrittlement as long as the alloying element binds to hydrogen sufficiently strongly and its concentration is above a certain level. In the other extreme, when the binding of hydrogen to the surface is so weak that hydrogen desorption occurs simultaneously as surface diffusion, the model demonstrates that above a certain desorption rate, there may be not enough hydrogen diffusing to the crack tip to cause embrittlement.

Original languageEnglish (US)
Pages (from-to)551-554
Number of pages4
JournalIntermetallics
Volume11
Issue number6
DOIs
StatePublished - Jun 2003

Keywords

  • B. Bonding
  • B. Diffusion
  • B. Hydrogen embrittlement
  • B. Surface properties
  • E. Atomistic simulations

ASJC Scopus subject areas

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

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