On the structure and chemistry of Ni3Al on an atomic scale via atom-probe field-ion microscopy

G. P.E.M. Van Bakel, K. Hariharan, David N Seidman*

*Corresponding author for this work

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

The atom-probe field-ion microscope (APFIM) is employed to study the structure and chemistry of boron-doped Ni3Al on an atomic scale. In this study annealed melt-extracted wire specimens were analyzed using time-of-flight mass spectroscopy along the 〈100〉 direction exposing the 100 fundamental and superlattice planes. Not only is the depth resolution equal to the interplanar spacing of 0.18 nm, but the transitions between these planes are unambiguously identified by characteristic changes in the field-evaporation rate. The identification of the plane transitions allows, for the first time, to precisely count the number of detected atoms per plane in this material. The extent of the interruption associated with the transition from a pure nickel plane to a mixed nickel-aluminum plane is not significantly different from the reverse transition. From the small number of Al atoms encountered in the supposed pure Ni planes and the symmetry of the cubic system, it is inferred that variations in the measured composition of the mixed planes are not a result of actual composition fluctuations in this alloy, as has been previously argued.

Original languageEnglish (US)
Pages (from-to)95-105
Number of pages11
JournalApplied Surface Science
Volume90
Issue number1
DOIs
StatePublished - Jan 1 1995

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ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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