Direct observations of nucleation in a nondilute multicomponent alloy

Chantal K. Sudbrack*, Ronald D. Noebe, David N. Seidman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

64 Scopus citations

Abstract

The chemical pathways leading to γ′ (L 12) nucleation from nondilute Ni-5.2 Al-14.2 Cr at.%, γ (fcc), at 873 K are followed with radial distribution functions and isoconcentration surface analyses of direct-space atom-probe tomographic images. Although Cr atoms initially are randomly distributed, a distribution of congruent Ni3 Al short-range-order domains (SRO), R ≅0.6 nm, results from Al diffusion during quenching. Domain site occupancy develops as their number density increases leading to Al-rich phase separation by γ′ -nucleation, R =0.75 nm, after SRO occurs.

Original languageEnglish (US)
Article number212101
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume73
Issue number21
DOIs
StatePublished - 2006

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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