A hardening model considering grain size effect for ion-irradiated polycrystals under nanoindentation
| Autor: | Chao Jiang, X.Y. Long, Bochuan Li, Liu Kai, Xiazi Xiao |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Work (thermodynamics)
Materials science 020209 energy TK9001-9401 02 engineering and technology Mechanics Nanoindentation Square (algebra) 030218 nuclear medicine & medical imaging 03 medical and health sciences Superposition principle 0302 clinical medicine Nuclear Energy and Engineering Hardness Ion irradiation Indentation 0202 electrical engineering electronic engineering information engineering Hardening (metallurgy) Grain size effect Nuclear engineering. Atomic power Grain boundary Theoretical model Dislocation |
| Zdroj: | Nuclear Engineering and Technology, Vol 53, Iss 9, Pp 2960-2967 (2021) |
| ISSN: | 1738-5733 |
| Popis: | In this work, a new hardening model is proposed for the depth-dependent hardness of ion-irradiated polycrystals with obvious grain size effect. Dominant hardening mechanisms are addressed in the model, including the contribution of dislocations, irradiation-induced defects and grain boundaries. Two versions of the hardening model are compared, including the linear and square superposition models. A succinct parameter calibration method is modified to parametrize the models based on experimentally obtained hardness vs. indentation depth curves. It is noticed that both models can well characterize the experimental data of unirradiated polycrystals; whereas, the square superposition model performs better for ion-irradiated materials, therefore, the square superposition model is recommended. In addition, the new model separates the grain size effect from the dislocation hardening contribution, which makes the physical meaning of fitted parameters more rational when compared with existing hardness analysis models. |
| Databáze: | OpenAIRE |
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