Enhancing resistance to radiation hardening and radiation thermal conductivity degradation by tungsten/graphene interface engineering
| Autor: | Jiangchao Liu, Re Xia, Jun Tang, Jiejie Li, Xiangheng Xiao, Hengjiang Cong, Jianli Wang, Wenqing Li, Shuyao Si, Changzhong Jiang |
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| Rok vydání: | 2020 |
| Předmět: |
Nuclear and High Energy Physics
Materials science Graphene chemistry.chemical_element 02 engineering and technology Tungsten 021001 nanoscience & nanotechnology 01 natural sciences 010305 fluids & plasmas law.invention Thermal conductivity Nuclear Energy and Engineering chemistry law 0103 physical sciences Monolayer Hardening (metallurgy) Radiation damage General Materials Science Irradiation Composite material 0210 nano-technology Radiation resistance |
| Zdroj: | Journal of Nuclear Materials. 539:152348 |
| ISSN: | 0022-3115 |
| DOI: | 10.1016/j.jnucmat.2020.152348 |
| Popis: | Radiation damage could be effectively alleviated by metal/graphene interfaces, which act as sinks to absorb defects spontaneously. In this study, four indispensable properties of tungsten nanofilms with inserted graphene monolayers were investigated, including changes in the thermal and mechanical properties as well as their respective radiation responses. We demonstrated that after the introduction of monolayer graphene, the hardness of the tungsten nanofilm was enhanced significantly by graphene interfaces with different densities. Molecular dynamics simulations showed that the presence of graphene interfaces can effectively inhibit dislocation propagation and delay the plastic deformation of tungsten. The cross-plane thermal conductivity of the tungsten nanofilms decreased after graphene was inserted, and this trend became more gradual as the density of the graphene interfaces increased. Uniquely, the thermal conductivity of the tungsten–graphene multilayered nanofilm showed a reduction of ∼20% after He-ion irradiation at 12.8 dpa compared to the greater than 50% reduction in the pure tungsten nanofilm. Moreover, the hardness of the pure tungsten nanofilm showed an increase of ∼160%, while the multilayer nanofilms exhibited almost no irradiation hardening. Transmission electron microscopy was used to analyze the effect of defects on the hardness and heat transport. Our results suggest that constructing tungsten/graphene interfaces has great potential in enhancing resistance to radiation thermal conductivity reduction and radiation hardening. |
| Databáze: | OpenAIRE |
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