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DOE OSTI · 2583697

Correlated transmission electron microscopy and atom probe tomography characterization of ion irradiated Ni-based alloy Hastelloy N

Gardner, Hazel M. [University of Oxford (United Kingdom); United Kingdom Atomic Energy Authority (UKAEA), Abingdon (United Kingdom)]·Schoell, Ryan [North Carolina State University, Raleigh, NC (United States); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)]·Qiu, Jie [University of California, Berkeley, CA (United States)]·Carter, Megan [University of Oxford (United Kingdom)]·Hosemann, Peter [University of California, Berkeley, CA (United States)]·Moody, Michael [University of Oxford (United Kingdom)]·Kaoumi, Djamel [North Carolina State University, Raleigh, NC (United States)]·Armstrong, David E.J. [University of Oxford (United Kingdom)]
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Abstract

Ion irradiation of Hastelloy N was conducted to better characterize the effects of irradiation on Hastelloy N using modern tools compared to studies done in the 1950s. The 2 MeV Ni + ion irradiation at 600 °C of Hastelloy N has been investigated using atom probe tomography, transmission electron microscopy and energy dispersive spectroscopy. Irradiation is found to promote formation of nanoscale M 2 C carbides over the thermodynamically favored M 6 C. Segregation of Si to dislocation loops and grain boundaries was also evident and may have assisted in formation of M 2 C. These microstructural changes result in a 20 % hardness increase caused by irradiation alone. These observations are useful in the design of new materials better suited for the harsh environment of a molten salt reactor.

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Gardner, Hazel M. [University of Oxford (United Kingdom); United Kingdom Atomic Energy Authority (UKAEA), Abingdon (United Kingdom)], Schoell, Ryan [North Carolina State University, Raleigh, NC (United States); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)], Qiu, Jie [University of California, Berkeley, CA (United States)], Carter, Megan [University of Oxford (United Kingdom)], Hosemann, Peter [University of California, Berkeley, CA (United States)], Moody, Michael [University of Oxford (United Kingdom)], Kaoumi, Djamel [North Carolina State University, Raleigh, NC (United States)], Armstrong, David E.J. [University of Oxford (United Kingdom)]. 2025-06-28. Correlated transmission electron microscopy and atom probe tomography characterization of ion irradiated Ni-based alloy Hastelloy N. https://doi.org/10.1016/j.matchar.2025.115316

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