On the field evaporation behavior of a model Ni-Al-Cr superalloy studied by picosecond pulsed-laser atom-probe tomography

Yang Zhou, Christopher Booth-Morrison, David N Seidman

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

The effects of varying the pulse energy of a picosecond laser used in the pulsed-laser atom-probe (PLAP) tomography of an as-quenched Ni-6.5 Al-9.5 Cr at.% alloy are assessed based on the quality of the mass spectra and the compositional accuracy of the technique. Compared to pulsed-voltage atom-probe tomography, PLAP tomography improves mass resolving power, decreases noise levels, and improves compositional accuracy. Experimental evidence suggests that Ni2+, Al2+, and Cr2+ ions are formed primarily by a thermally activated evaporation process, and not by post-ionization of the ions in the 1+ charge state. An analysis of the detected noise levels reveals that for properly chosen instrument parameters, there is no significant steady-state heating of the Ni-6.5 Al-9.5 Cr at.% tips during PLAP tomography.

Original languageEnglish (US)
Pages (from-to)571-580
Number of pages10
JournalMicroscopy and Microanalysis
Volume14
Issue number6
DOIs
StatePublished - Dec 1 2008

Keywords

  • Nickel-based superalloys
  • Post-ionization
  • Preferential evaporation
  • Pulsed-laser atom-probe tomography

ASJC Scopus subject areas

  • Instrumentation

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