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On the Field Evaporation Behavior of a Model Ni-Al-Cr Superalloy Studied by Picosecond Pulsed-Laser Atom-Probe Tomography

Published online by Cambridge University Press:  06 November 2008

Yang Zhou ,
Christopher Booth-Morrison  and
David N. Seidman
Yang Zhou
Affiliation:
Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL 60208-3108, USA
Christopher Booth-Morrison
Affiliation:
Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL 60208-3108, USA
David N. Seidman*
Affiliation:
Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL 60208-3108, USA Northwestern UniversityCenter for Atom-Probe Tomography (NUCAPT), 2220 Campus Drive, Evanston, IL 60208-3108, USA
*
Corresponding author. E-mail: d-seidman@northwestern.edu
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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.

Keywords

pulsed-laser atom-probe tomographypost-ionizationpreferential evaporationnickel-based superalloys
Type
Microanalysis
Information
Microscopy and Microanalysis , Volume 14 , Issue 6 , December 2008 , pp. 571 - 580
Copyright
Copyright © Microscopy Society of America 2008

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