Enhanced helium ion irradiation tolerance in a Fe-Co-Ni-Cr-Al-Ti high-entropy alloy with L1 2 nanoparticles

Zhaoa, Y. L.1; Meng, F. L.2; Yang, T.3; Luan, J. H.3; Liu, S. F.4; Yeli, G. M.5; Lin, W. T.; Liu, W. H.1; Liu, X. J.1; Liu, C. T.3; Kai, J. J.4

2023-04-20

10.1016/j.jmst.2022.09.053

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY   Impact Factor & Quartile

1005-0302

1941-1162

L1 2 -strengthened high entropy alloys (HEAs) with excellent room and high-temperature mechanical properties have been proposed as promising candidates as structural materials for advanced nuclear systems. However, knowledge about their radiation response is fairly limited. In the present work, a novel HEA with a high density of L1 2 nanoparticles was irradiated with He ion at 500 degrees C. Transmission electron microscope (TEM) and atom probe tomography (APT) were employed to study the evolution of microstructural stability and radiation-induced segregation. Similar to the single-phase FeCoNiCr HEA, the main microstructural features were numerous large faulted dislocation loops and helium bubbles. While the irradiation resistance of the present L1 2 -strengthened HEA is much improved in terms of reduced bubble size, which could be attributed to the considerable He trapping efficiency of the coherent precipitate/matrix interface and the enhanced capability of the interface for damage elimination when the matrix channel width is narrow. APT analysis revealed that an inverse-Kirkendall-mechanism-dominated radiation-induced segregation (RIS) occurs around bubbles, where a significant Co enrichment and Ni depletion can be clearly observed. In addition, the competing dynamics of ballistic mixing and elemental clustering that raised from the irradiation-enhanced diffusion in a highly supersaturated matrix, along with the low precipitation nucleation barrier due to the small lattice misfit, lead to a dynamical precipitation dissolution and re-precipitation appears under irradiation. Such a promising phenomenon is expected to promote a potential self-healing effect and could in turn provide a sustainable irradiation tolerance over the operational lifetime of a reactor. (c) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

L1 2 nanoparticles High -entropy alloy Helium bubble Phase stability Radiation -induced segregation

SCI

English

Others

National Natural Science Foundation of China["52101135","52101151"] ; Shenzhen Science and Technology Program["RCBS20210609103202012","SGDX20210823104002016"] ; Hong Kong Research Grant Council (RGC)["CityU 21205621","C1017 -21G"] ; Guangdong Basic and Applied Basic Research Foundation[2020A1515110647]

Materials Science ; Metallurgy & Metallurgical Engineering

Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000918954100005

JOURNAL MATER SCI TECHNOL

MATERIALS SCIENCE

2-s2.0-85142710656

Web of Science

1.Harbin Inst Technol Shenzhen, Sch Mat Sci & Engn, Shenzhen 518055, Peoples R China
2.Southern Univ Sci & Technol, Sch Mat Sci & Engn, Shenzhen 518055, Peoples R China
3.City Univ Hong Kong, Dept Mat Sci & Engn, Shenyang Natl Lab Mat Sci, Mech Behav Div, Hong Kong, Peoples R China
4.City Univ Hong Kong, Dept Mech Engn, Hong Kong, Peoples R China
5.Tsinghua Univ, Inst Nucl & New Energy Technol, Beijing 100084, Peoples R China

Zhaoa, Y. L.,Meng, F. L.,Yang, T.,et al. Enhanced helium ion irradiation tolerance in a Fe-Co-Ni-Cr-Al-Ti high-entropy alloy with L1 2 nanoparticles[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2023,143:169-177.

Zhaoa, Y. L..,Meng, F. L..,Yang, T..,Luan, J. H..,Liu, S. F..,...&Kai, J. J..(2023).Enhanced helium ion irradiation tolerance in a Fe-Co-Ni-Cr-Al-Ti high-entropy alloy with L1 2 nanoparticles.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,143,169-177.

Zhaoa, Y. L.,et al."Enhanced helium ion irradiation tolerance in a Fe-Co-Ni-Cr-Al-Ti high-entropy alloy with L1 2 nanoparticles".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 143(2023):169-177.