Effect of tungsten/graphene/tungsten interface on helium diffusion kinetics and mechanical properties and defects of tungsten as first wall material - first principle calculation
| Autor: | Jun Jie Geng, Zhao Chun Zhang, Shun Guo, Hai Bo Guo, Yao Ping Xie |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Diffusion chemistry.chemical_element 02 engineering and technology Tungsten 010402 general chemistry 01 natural sciences Molecular physics law.invention symbols.namesake law Phase (matter) Physics::Atomic and Molecular Clusters Materials Chemistry Physics::Atomic Physics Ductility Debye model Helium Graphene Mechanical Engineering Metals and Alloys 021001 nanoscience & nanotechnology Crystallographic defect 0104 chemical sciences chemistry Mechanics of Materials symbols Physics::Accelerator Physics 0210 nano-technology |
| Zdroj: | Journal of Alloys and Compounds. 851:156760 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2020.156760 |
| Popis: | In Tokamak device, helium atoms caused by the fusion reaction will generate helium bubbles and point defects after entering the first wall material composed of tungsten metal, which will seriously affect the stability of the first wall material. Therefore, we designed the tungsten/graphene/tungsten interface material as a new first wall material. It was found from first-principles calculations that the interface can trap helium atoms to reduce the diffusion of helium atoms from the interface to the tungsten phase again. The interface also traps vacancies and accelerates the recombination of vacancies and self-interstitial atoms. Using the quasi-harmonic Debye model, we found that the presence of the graphene layer can also improve the ductility, at a cost of reducing the mechanical modulus of the tungsten metal. |
| Databáze: | OpenAIRE |
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