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arXiv · 2308.16174

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

W. Streit Cunningham·Jungho Shin·Tianjiao Lei·Timothy J Rupert·Daniel S. Gianola
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Abstract

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.

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W. Streit Cunningham, Jungho Shin, Tianjiao Lei, Timothy J Rupert, Daniel S. Gianola. 2023-08-30. High-throughput assessment of the microstructural stability of segregation-engineered nanocrystalline Al-Ni-Y alloys. https://arxiv.org/abs/2308.16174

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