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A NiAlMnCu-containing steel during ageing at 500°C up to 100h exhibits an interesting age-hardening effect. Careful atom probe tomography investigations confirm that small clusters, enriched with Ni, Al, Mn and Cu, formed in the steel after a short ageing of 0.25h. Composite precipitates, consisting of a NiAl-rich and a Cu-rich component side by side, formed after 4h ageing, a phenomenon which corresponded...
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