Self-ion irradiation effects on nanoindentation-induced plasticity of crystalline iron: A joint experimental and computational study
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866929720066572288 |
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| author | Mulewska, K. Rovaris, F. Dominguez-Gutierrez, F. J. Huo, W. Y. Kalita, D. Jozwik, I. Papanikolaou, S. Alava, M. J. Kurpaska, L. Jagielski, J. |
| author_facet | Mulewska, K. Rovaris, F. Dominguez-Gutierrez, F. J. Huo, W. Y. Kalita, D. Jozwik, I. Papanikolaou, S. Alava, M. J. Kurpaska, L. Jagielski, J. |
| contents | In this paper, experimental work is supported by multi-scale numerical modeling to investigate nanomechanical response of pristine and ion irradiated with Fe2+ ions with energy 5 MeV high purity iron specimens by nanoindentation and Electron Backscatter Diffraction. The appearance of a sudden displacement burst that is observed during the loading process in the load-displacement curves is connected with increased shear stress in a small subsurface volume due to dislocation slip activation and mobilization of pre-existing dislocations by irradiation. The molecular dynamics (MD) and 3D-discrete dislocation dynamics (3D-DDD) simulations are applied to model geometrically necessary dislocations (GNDs) nucleation mechanisms at early stages of nanoindentation test; providing an insight to the mechanical response of the material and its plastic instability and are in a qualitative agreement with GNDs density mapping images. Finally, we noted that dislocations and defects nucleated are responsible the material hardness increase, as observed in recorded load-displacement curves and pop-ins analysis. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2502_13505 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Self-ion irradiation effects on nanoindentation-induced plasticity of crystalline iron: A joint experimental and computational study Mulewska, K. Rovaris, F. Dominguez-Gutierrez, F. J. Huo, W. Y. Kalita, D. Jozwik, I. Papanikolaou, S. Alava, M. J. Kurpaska, L. Jagielski, J. Materials Science In this paper, experimental work is supported by multi-scale numerical modeling to investigate nanomechanical response of pristine and ion irradiated with Fe2+ ions with energy 5 MeV high purity iron specimens by nanoindentation and Electron Backscatter Diffraction. The appearance of a sudden displacement burst that is observed during the loading process in the load-displacement curves is connected with increased shear stress in a small subsurface volume due to dislocation slip activation and mobilization of pre-existing dislocations by irradiation. The molecular dynamics (MD) and 3D-discrete dislocation dynamics (3D-DDD) simulations are applied to model geometrically necessary dislocations (GNDs) nucleation mechanisms at early stages of nanoindentation test; providing an insight to the mechanical response of the material and its plastic instability and are in a qualitative agreement with GNDs density mapping images. Finally, we noted that dislocations and defects nucleated are responsible the material hardness increase, as observed in recorded load-displacement curves and pop-ins analysis. |
| title | Self-ion irradiation effects on nanoindentation-induced plasticity of crystalline iron: A joint experimental and computational study |
| topic | Materials Science |
| url | https://arxiv.org/abs/2502.13505 |