Structurally complex phase engineering enables hydrogen-tolerant Al alloys.

ABSTRACT: Hydrogen embrittlement (HE) impairs the durability of aluminium (Al) alloys and hinders their use in a hydrogen economy^1-3. Intermetallic compound particles in Al alloys can trap hydrogen and mitigate HE⁴, but these particles usually form in a low number density compared with conventional strengthening nanoprecipitates. Here we report a size-sieved complex precipitation in Sc-added Al-Mg alloys to achieve a high-density dispersion of both fine Al₃Sc nanoprecipitates and in situ formed core-shell Al₃(Mg, Sc)₂/Al₃Sc nanophases with high hydrogen-trapping ability. The two-step heat treatment induces heterogeneous nucleation of the Samson-phase Al₃(Mg, Sc)₂ on the surface of Al₃Sc nanoprecipitate

SUBMITTER: Jiang S 

PROVIDER: S-EPMC12058518 | biostudies-literature | 2025 May

REPOSITORIES: biostudies-literature