Towards observing interstitial hydrogen in solution in metal lattices.

Deuterium in FCC multi-principal-element alloys with coherent precipitates reproducibly concentrates in hydrogen-affinitive phases, enabling APT to distinguish interstitial hydrogen in solution from defect-trapped hydrogen.

• Why it matters: Detecting and localizing dilute, mobile interstitial hydrogen in metals is hindered by low solubility, trapping ambiguity, and APT artefacts from hydrogen introduction.
• What they did: The study used deuterium as a proxy for hydrogen in FCC MPEAs with coherent FCC precipitates, then compared deuterium partitioning across phases with different local chemistry and crystal structure.
• The result: Deuterium content differences between phases match calculated hydrogen solution energies, showing APT can probe hydrogen in solid solution beyond hydrides and solute-decorated defects.

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