| Record |
| Title |
Zhou, Yang; Booth-Morrison, Christopher; Seidman, David N. |
Year |
On the field-evaporation behavior of a model Ni-Al-Cr superalloy studied by picosecond pulsed-laser atom probe tomography |
Abbreviated Journal |
Journal Article |
| Issue |
2008 |
Keywords |
Microscopy and Microanalysis |
| Address |
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| Thesis |
14 |
| Place of Publication |
06 |
Language |
571-580 |
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| Series Title |
The effects of varying the laser pulse-energy of a picosecond laser used in pulsed-laser atom- probe (PLAP) tomography of an as-quenched Ni-6.24 Al- 9.64 Cr at.% are assessed based on the quality of the mass spectra and the compositional accuracy of the technique. PLAP tomography improves mass resolution, increases the signal-to-noise (S/N) ratio, and improves compositional accuracy, compared to pulsed-voltage atom-probe tomography (APT). Experimental evidence suggests that Ni2+, Al2+ and Cr2+ ions are formed by post-ionization of singly charged ions, as well as by a thermally-activated evaporation process. An analysis of the detected noise levels reveals that there is no significant steady-state heating of the Ni-6.24 Al- 9.64 Cr at.% tips during PLAP tomography for properly chosen instrument parameters. |
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NU @ m-krug @ |
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10216 |
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