First principles calculations of beryllium stability in zirconium surfaces

Abhinav C.P. Jain, Dallas R. Trinkle

Research output: Contribution to journalArticle

Abstract

High-temperature oxidation of zircaloys poses a serious safety risk for nuclear fuel cladding applications, thus driving the search for oxidation resistant alloys. Ellingham diagrams suggest preferential oxidation of beryllium over zirconium, but the atomic-scale behavior of Be near Zr surfaces is unknown. We perform first principle calculations using density functional theory to investigate the stability of Be at possible sites in the Zr surfaces and bulk. Our calculations predict that Be favors substitutional sites and prefers to segregate to the surface layers. Charge density analysis shows charge redistribution around the solute atom in substitutional sites which leads to increased bonding and explains the high stability of these sites. The calculated surface segregation energy suggests that Be migrates towards the surface at high temperatures, which could enhance oxidation resistance.

Original languageEnglish (US)
Pages (from-to)359-368
Number of pages10
JournalActa Materialia
Volume122
DOIs
StatePublished - Jan 1 2017

Keywords

  • Electronic structure
  • First-principles calculation
  • Surface segregation
  • Zirconium
  • Zirconium alloys

ASJC Scopus subject areas

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

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