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Transmission Kikuchi Diffraction Mapping Induces Structural Damage in Atom Probe Specimens.

Authors :
Gault B
Khanchandani H
Prithiv TS
Antonov S
Britton TB
Source :
Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada [Microsc Microanal] 2023 Jun 09; Vol. 29 (3), pp. 1026-1036.
Publication Year :
2023

Abstract

Measuring local chemistry of specific crystallographic features by atom probe tomography (APT) is facilitated by using transmission Kikuchi diffraction (TKD) to help position them sufficiently close to the apex of the needle-shaped specimen. However, possible structural damage associated to the energetic electrons used to perform TKD is rarely considered and is hence not well-understood. Here, in two case studies, we evidence damage in APT specimens from TKD mapping. First, we analyze a solid solution, metastable β-Ti-12Mo alloy, in which the Mo is expected to be homogenously distributed. Following TKD, APT reveals a planar segregation of Mo among other elements. Second, specimens were prepared near Σ3 twin boundaries in a high manganese twinning-induced plasticity steel, and subsequently charged with deuterium gas. Beyond a similar planar segregation, voids containing a high concentration of deuterium, i.e., bubbles, are detected in the specimen on which TKD was performed. Both examples showcase damage from TKD mapping leading to artefacts in the distribution of solutes. We propose that the structural damage is created by surface species, including H and C, subjected to recoil from incoming energetic electrons during mapping, thereby getting implanted and causing cascades of structural damage in the sample.<br />Competing Interests: Conflict of Interest The authors declare that they have no competing interest.<br /> (© The Author(s) 2023. Published by Oxford University Press on behalf of the Microscopy Society of America.)

Details

Language :
English
ISSN :
1435-8115
Volume :
29
Issue :
3
Database :
MEDLINE
Journal :
Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
Publication Type :
Academic Journal
Accession number :
37749672
Full Text :
https://doi.org/10.1093/micmic/ozad029