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Understanding hydrogen embrittlement in steels

Hydrogen at defects
This atom probe tomography dataset is a thin slice of a 3-Dimensional dataset that demonstrates how hydrogen (isotopically pure 2H in this case) segregates to dislocations in high-strength steels that are also rich in carbon highlighted by the heat map with red showing the highest concentration. 

Recorded on CAMECA 4000X SiTM at University of Sydney, Australia. Image courtesy of Dr. Chen.
Y-S. Chen et al. Observation of hydrogen trapping at dislocations, grain boundaries, and precipitates. Science, Vol 367, 171-175 (2020).