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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
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Area of Science:

  • Materials Science
  • Metallurgy
  • Hydrogen Embrittlement Research

Background:

  • Hydrogen embrittlement (HE) limits the durability and application of aluminum (Al) alloys, particularly in hydrogen energy technologies.
  • Existing hydrogen trapping sites in Al alloys, such as intermetallic compounds, are often low in density compared to strengthening nanoprecipitates.

Purpose of the Study:

  • To engineer a high-density dispersion of dual nanoprecipitates in Sc-added Al-Mg alloys for enhanced hydrogen trapping.
  • To improve the hydrogen embrittlement resistance and mechanical strength of aluminum alloys.

Main Methods:

  • A size-sieved complex precipitation strategy was employed in Sc-added Al-Mg alloys.
  • A two-step heat treatment induced heterogeneous nucleation of Al3(Mg,Sc)2 on Al3Sc nanoprecipitates larger than 10 nm.
  • The size-dependent formation mechanism of the core-shell nanostructures was investigated.

Main Results:

  • Achieved a high-density dispersion of Al3Sc and core-shell Al3(Mg,Sc)2/Al3Sc nanophases with superior hydrogen-trapping capabilities.
  • The tailored dual nanoprecipitate distribution resulted in a 40% increase in strength and a fivefold improvement in HE resistance.
  • Demonstrated record tensile uniform elongation in hydrogen-charged Al alloys (up to 7 ppmw H).

Conclusions:

  • The developed size-sieved precipitation strategy effectively enhances hydrogen resistance in high-strength Al alloys.
  • This approach is adaptable for large-scale industrial production and applicable to various Al-Mg-based alloys.
  • The findings offer a promising route for advancing materials for the hydrogen economy.