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Compositional Effects of Additively Manufactured Refractory High-Entropy Alloys under High-Energy Helium Irradiation
Eric Lang1,2, Kory Burns1,3, Yongqiang Wang4
1Sandia National Laboratories, Albuquerque, NM 87185, USA.
Nanomaterials (Basel, Switzerland)
|June 24, 2022
Summary
High-entropy alloys (HEAs) show promise for radiation environments. Additive manufacturing and complex compositions can mitigate helium bubble effects, crucial for advanced material applications.
Area of Science:
- Materials Science
- Nuclear Engineering
- Metallurgy
Background:
- High-entropy alloys (HEAs) are candidates for extreme environments, including fission and fusion radiation applications.
- Additive manufacturing (AM) enables tailored processing for these demanding applications.
- Understanding irradiation effects on HEAs is critical for expanding their use in radiation environments.
Purpose of the Study:
- To investigate the response of additively manufactured refractory high-entropy alloys (RHEAs) to helium (He) ion bombardment.
- To elucidate the relationship between alloy composition and helium bubble formation in RHEAs.
Main Methods:
- Utilized analytical microscopy techniques to study RHEAs after helium ion bombardment.
- Examined the interplay between alloy composition, helium bubble size, and density.
Main Results:
- Demonstrated that increasing compositional complexity in RHEAs can limit the detrimental effects of helium bubbles.
- Observed a correlation between specific elemental compositions and reduced helium bubble formation.
- Highlighted the need for careful selection of constituent elements in HEA design for radiation resistance.
Conclusions:
- Additive manufacturing of RHEAs offers a pathway for developing radiation-tolerant materials.
- Compositional complexity plays a key role in mitigating helium embrittlement in HEAs.
- Strategic alloy design is essential for optimizing HEA performance in high-radiation environments.
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