High-throughput assessment of the microstructural stability of segregation-engineered nanocrystalline Al-Ni-Y alloys

Segregation engineering has emerged as a promising pathway towards designing thermally stable nanocrystalline alloys with enhanced mechanical properties. However, the compositional and processing space for solute stabilized microstructures is vast, thus the application of high-throughput techniques...

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Veröffentlicht in:Materialia 2023-12, Vol.32, p.101940, Article 101940
Hauptverfasser: Cunningham, W. Streit, Shin, Jungho, Lei, Tianjiao, Rupert, Timothy J, Gianola, Daniel S.
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Sprache:eng
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Zusammenfassung:Segregation engineering has emerged as a promising pathway towards designing thermally stable nanocrystalline alloys with enhanced mechanical properties. However, the compositional and processing space for solute stabilized microstructures is vast, thus the application of high-throughput techniques to accelerate optimal material development is increasingly attractive. In this work, combinatorial synthesis is combined with high-throughput characterization techniques to explore microstructural transitions through annealing of a nanocrystalline ternary Al-base alloy containing a transition metal (TM=Ni) and rare earth dopant (RE=Y). A down-selected optimal composition with the highest thermal stability is annealed through in situ transmission electron microscopy, revealing that the removal of the RE species is correlated to a reduction in the microstructural stability at high temperatures as a result of variations in intermetallic phase formation. Results demonstrate the benefits of co-segregation for enhancing mechanical hardness and delaying the onset of microstructural instability. [Display omitted]
ISSN:2589-1529
2589-1529
DOI:10.1016/j.mtla.2023.101940