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Related Experiment Video

Updated: Dec 18, 2025

Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis

Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis

Published on: March 29, 2016

Origin of micrometer-scale dislocation motion during hydrogen desorption.

Motomichi Koyama¹, Seyedeh Mohadeseh Taheri-Mousavi^2,3, Haoxue Yan²

¹Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan.

Science Advances

|June 18, 2020

Summary

Hydrogen desorption causes dislocation movement in high-strength metals. Grain boundary hydrogen segregation induces stresses, explaining hydrogen embrittlement mechanisms and informing future research.

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Last Updated: Dec 18, 2025

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Area of Science:

Materials Science
Metallurgy
Hydrogen Embrittlement

Background:

Hydrogen is a key energy carrier but causes significant embrittlement in high-strength metals.
Understanding hydrogen-defect interactions is crucial for mitigating this issue.

Purpose of the Study:

To investigate the mechanisms of hydrogen-induced embrittlement in metals.
To elucidate the role of hydrogen-defect interactions in material failure.

Main Methods:

In situ electron channeling contrast imaging under no external stress.
Molecular dynamics simulations.
Grand canonical Monte Carlo simulations.

Main Results:

Dislocations moved up to 1.5 μm during hydrogen desorption.
Grain boundary hydrogen segregation was found to induce long-range shear stresses and short-range atomic stress fluctuations.

Conclusions:

Hydrogen desorption can drive significant dislocation motion.
Grain boundary hydrogen segregation is a critical factor in hydrogen embrittlement.
These segregation effects must be widely considered in hydrogen research.