Effect of microalloying additions on microstructural evolution and thermal stability in cast Al-Ni alloys

Kwon, Sun Yong; Shin, Dongwon; Michi, Richard A.; Poplawsky, Jonathan D.; Wang, Hsin; Yang, Ying; Bahl, Sumit; Shyam, Amit; Plotkowski, Alex

doi:10.1016/j.jallcom.2024.174810

Title: Effect of microalloying additions on microstructural evolution and thermal stability in cast Al-Ni alloys

Journal Article · 11 May 2024 · Journal of Alloys and Compounds

DOI: https://doi.org/10.1016/j.jallcom.2024.174810 · OSTI ID:2376349

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^[1]; Michi, Richard A. ^[1];

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^[1]; Bahl, Sumit ^[1];

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Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Enhancement of thermal stability in Al-Ni alloys through microalloying with slow-diffusing elements, specifically Zr, has been previously reported which is attributed to Zr segregation at the Al/Al₃Ni interface. In this study, we explore the influence of microalloying Al-Ni alloys with Zr, Ti, V, and Fe on microstructural evolution, hardness, and electrical and thermal conductivity across a range of heat-treatment temperatures from 300 to 450 °C. The distribution of microalloying elements and precipitates after heat treatment is characterized using atom probe tomography (APT). Our investigation confirms Zr segregation to the Al/Al₃Ni interface, while similar interfacial segregation is absent with the addition of Ti, V, and Fe. Additionally, our analysis of the Al₃Ni microfiber morphology reveals that their coarsening and spheroidization rates are similar with and without interfacial segregation; thus, retaining the fiber reinforcement through interfacial segregation of slow diffusing elements may not be an effective strategy. Precipitation of L1₂ nanoparticles was found to be the dominant mechanism affecting enhanced hardness and electrical conductivity in Al-Ni-Zr alloys, attributed to precipitation strengthening and solute depletion, respectively. Similar precipitation was not observed for additions of Ti, V, and Fe following heat treatment. We provide a thermodynamic explanation for this limitation. Furthermore, the findings of this study suggest that an effective approach for designing Al-Ni alloys should involve prioritizing microalloying elements to maximize L1₂ precipitation and minimize solute content in the FCC-Al matrix post heat treatment, rather than focusing on Al/Al3Ni interfacial segregation.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2376349

Journal Information:: Journal of Alloys and Compounds, Journal Name: Journal of Alloys and Compounds Vol. 997; ISSN 0925-8388

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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