|Atom Probe Tomography for the Observation of Hydrogen in Materials: A Review
|Chen, Yi Sheng
Liu, Pang Yu
Marceau, Ross K.W.
Cairney, Julie M.
|atom probe tomography | hydride | hydrogen embrittlement | hydrogen mapping | hydrogen trapping | metals
|Microscopy and Microanalysis
Atom probe tomography (APT) is an emerging microscopy technique that has high sensitivity for hydrogen with sub-nanometre-scale spatial resolution, which makes it a unique method to investigate the atomic-scale distribution of hydrogen at interfaces and defects in materials. This article introduces the basics of APT-based hydrogen analysis, particularly the challenge of distinguishing a hydrogen background signal in APT by using hydrogen isotopes, along with strategies to yield high-quality analysis. This article also reviews several important findings on hydrogen distribution in a range of materials, including both structural alloys and functional materials, enabled by using APT. Limitations and future opportunities for hydrogen analysis by APT are also discussed.
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