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About this Abstract
Meeting	2024 TMS Annual Meeting & Exhibition
Symposium	Materials Informatics to Accelerate Nuclear Materials Investigation
Presentation Title	E-26: Materials Genomics Search for Possible Helium-absorbing Nano-phases in Fusion Structural Materials and Experimental Validation
Author(s)	So Yeon Kim, Haowei Xu, Sina Kavak, Kübra Gürcan Bayrak, Myeong Jun Lee, Di Chen, Emre Tekoglu, Duygu Ağaoğulları, Erhan Ayas, Eun Soo Park, Cheng Sun, Ju Li
On-Site Speaker (Planned)	So Yeon Kim
Abstract Scope	Fusion power holds promise as an ultimate energy source. However, achieving sustainable civilian fusion requires addressing the embrittlement of polycrystalline materials by transmutation helium, which causes premature material failure, often within a year. Here we demonstrate that nanodispersions with atomic-scale free volume can store helium within their lattice interior, forming “helide compounds,” thereby significantly delaying critical helium damage in matrices. To identify potential helide formers, we defined and validated a metric for helium-absorbing capability and performed a large-scale computational screening based on this metric, additionally considering neutron absorption/activation, elastic moduli, melting temperature, thermodynamic compatibility, and wettability using Fe as a model matrix. Experimental/computational cross-verification shows that the identified phases can absorb >10 at% He, reducing helium bubble size and density. Our results suggest that 1-2 vol% of these phases can accommodate a few thousand appm of bulk helium, which is expected to be generated over a 10-year operational period.
Proceedings Inclusion?	Planned:

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