Colossal super saturation of oxygen at the iron-aluminum interfaces fabricated using solid state welding

N. Sridharan*, D. Isheim, D. N. Seidman, S. S. Babu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Solid state joining is achieved in three steps, (i) interface asperity deformation, (ii) oxide dispersion, followed by (iii) atomic contact and bonding. Atomically clean metallic surfaces without an oxide layer bond spontaneously. Despite its importance the oxide dispersion mechanism is not well studied. In this work the first ever atom probe study of iron-aluminum solid state welds show that the oxygen concentration at the interface is 20 at.%. This is significantly lower than any equilibrium oxide concentration. We therefore propose that the high-strain rate deformation at the interfaces renders the oxide unstable resulting in the observed concentration of oxygen.

Original languageEnglish (US)
Pages (from-to)196-199
Number of pages4
JournalScripta Materialia
Volume130
DOIs
StatePublished - Mar 15 2017

Keywords

  • Atom probe tomography
  • Oxide dispersion
  • Solid state welding

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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