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Transforming Dealloying: Max Planck Scientists Pioneer Sustainable Lightweight Alloy Design Through Corrosion
- Scientists at the Max Planck Institute for Sustainable Materials have developed a process that combines dealloying and alloying to create nanostructured alloys that are both lightweight and strong, according to research published in Science Advances.
- The researchers repurposed dealloying's ability to selectively dissolve metal alloys by harnessing reactive gas. Ammonia is added as a nitrogen donor and the process extracts oxygen and hydrogen to create porosity.
- Substitutional alloying then occurs, allowing solid-state interdiffusion between metallic elements after the complete removal of oxygen.
- This is followed by interstitial alloying, where nitrogen from the vapor phase infiltrates the host lattice of the newly formed metals. Finally, phase transformation processes are triggered, leading to thermally-induced martensitic transformations, a crucial pathway for achieving nanoscale structuring.
- This approach enhances mechanical properties and introduces interstitial nitrogen to fortify the material while reducing carbon emissions and water waste.
- The process creates sustainable, lightweight alloys that could be used in the automotive, aerospace, and energy storage industries, among others. The study predicts iron-nitride-based hard magnetic alloys could outperform current rare-earth magnets, leading to more efficient energy solutions.
- The rethinking of traditional metallurgical processes opens up a plethora of new avenues in material science, inspiring further innovations in sustainable materials.
- This research experience was generously provided by the Alexander von Humboldt Foundation, along with additional support through a European Advanced Research Grant and a Cooperation Grant awarded by the Max Planck and Fraunhofer Societies.
- By reframing traditional metallurgical processes, MPI-SusMat’s research opens up opportunities for reducing the reliance on rare earth materials and high-purity feedstocks, aligning with global sustainability aspirations.
- This pioneering work is expected to inspire further innovations in sustainable materials, establishing a new paradigm in the field of metallurgical engineering.
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