A hardening model considering grain size effect for ion-irradiated polycrystals under nanoindentation
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...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2021-09-01
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| Series: | Nuclear Engineering and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1738573321001492 |
| _version_ | 1818922538748608512 |
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| author | Kai Liu Xiangyun Long Bochuan Li Xiazi Xiao Chao Jiang |
| author_facet | Kai Liu Xiangyun Long Bochuan Li Xiazi Xiao Chao Jiang |
| author_sort | Kai Liu |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-20T01:55:08Z |
| format | Article |
| id | doaj.art-81b6173a214a4a1cba9b9719709ccd25 |
| institution | Directory Open Access Journal |
| issn | 1738-5733 |
| language | English |
| last_indexed | 2024-12-20T01:55:08Z |
| publishDate | 2021-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Engineering and Technology |
| spelling | doaj.art-81b6173a214a4a1cba9b9719709ccd252022-12-21T19:57:31ZengElsevierNuclear Engineering and Technology1738-57332021-09-0153929602967A hardening model considering grain size effect for ion-irradiated polycrystals under nanoindentationKai Liu0Xiangyun Long1Bochuan Li2Xiazi Xiao3Chao Jiang4State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, 410082 Changsha, ChinaState Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, 410082 Changsha, ChinaState Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, 410082 Changsha, ChinaDepartment of Mechanics, School of Civil Engineering, Central South University, Changsha, 410075, PR China; Corresponding author.State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, 410082 Changsha, China; Corresponding author.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.http://www.sciencedirect.com/science/article/pii/S1738573321001492HardnessIon irradiationGrain size effectTheoretical modelNanoindentation |
| spellingShingle | Kai Liu Xiangyun Long Bochuan Li Xiazi Xiao Chao Jiang A hardening model considering grain size effect for ion-irradiated polycrystals under nanoindentation Nuclear Engineering and Technology Hardness Ion irradiation Grain size effect Theoretical model Nanoindentation |
| title | A hardening model considering grain size effect for ion-irradiated polycrystals under nanoindentation |
| title_full | A hardening model considering grain size effect for ion-irradiated polycrystals under nanoindentation |
| title_fullStr | A hardening model considering grain size effect for ion-irradiated polycrystals under nanoindentation |
| title_full_unstemmed | A hardening model considering grain size effect for ion-irradiated polycrystals under nanoindentation |
| title_short | A hardening model considering grain size effect for ion-irradiated polycrystals under nanoindentation |
| title_sort | hardening model considering grain size effect for ion irradiated polycrystals under nanoindentation |
| topic | Hardness Ion irradiation Grain size effect Theoretical model Nanoindentation |
| url | http://www.sciencedirect.com/science/article/pii/S1738573321001492 |
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