Direct observation reveals how hydrogen weakens metal alloys

University of Sydney researchers have directly observed hydrogen dissolving in the spaces between metal atoms for the first time, revealing why hydrogen weakens metals and aiding development of more resistant materials. Published in Nature, the team used cryogenic atom probe tomography with deuterium to track hydrogen in alloys, finding its location depends on atomic arrangement and chemical makeup, not just defects. The findings could guide stronger, hydrogen-resistant alloys for storage and transport, supporting hydrogen energy technologies and Australia's clean energy transition.