Effect of Structural Relaxation on the Indentation Size Effect and Deformation Behavior of Cu–Zr–Based Nanoglasses
In this work, the deformation behavior of as-prepared (AP) and structurally relaxed (SR) Cu–Zr–based nanoglasses (NGs) are investigated using nano- and micro-indentation. The NGs are subjected to structural relaxation by annealing them close to the glass transition temperature without altering their...
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Frontiers Media S.A.
2021-06-01
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| Series: | Frontiers in Materials |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmats.2021.676764/full |
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| author | A Sharma Sree Harsha Nandam Horst Hahn Horst Hahn Horst Hahn K. Eswar Prasad |
| author_facet | A Sharma Sree Harsha Nandam Horst Hahn Horst Hahn Horst Hahn K. Eswar Prasad |
| author_sort | A Sharma |
| collection | DOAJ |
| description | In this work, the deformation behavior of as-prepared (AP) and structurally relaxed (SR) Cu–Zr–based nanoglasses (NGs) are investigated using nano- and micro-indentation. The NGs are subjected to structural relaxation by annealing them close to the glass transition temperature without altering their amorphous nature. The indentation load, p, vs. displacement, h, curves of SR samples are characterized by discrete displacement bursts, while the AP samples do not show any of them, suggesting that annealing has caused a local change in the amorphous structure. In both the samples, hardness (at nano- and micro-indentation) decreases with increasing p, demonstrating the indentation size effect. The micro-indentation imprints of SR NGs show evidence of shear bands at the periphery, indicating a heterogeneous plastic flow, while AP NG does not display any shear bands. Interestingly, the shear band density decreases with p, highlighting the fact that plastic strain is accommodated entirely by the shear bands in the subsurface deformation zone. The results are explained by the differences in the amorphous structure of the two NGs. |
| first_indexed | 2024-12-23T18:59:43Z |
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| institution | Directory Open Access Journal |
| issn | 2296-8016 |
| language | English |
| last_indexed | 2024-12-23T18:59:43Z |
| publishDate | 2021-06-01 |
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| series | Frontiers in Materials |
| spelling | doaj.art-c48825388a5c4999bb03ca414a1c57fe2022-12-21T17:34:45ZengFrontiers Media S.A.Frontiers in Materials2296-80162021-06-01810.3389/fmats.2021.676764676764Effect of Structural Relaxation on the Indentation Size Effect and Deformation Behavior of Cu–Zr–Based NanoglassesA Sharma0Sree Harsha Nandam1Horst Hahn2Horst Hahn3Horst Hahn4K. Eswar Prasad5Department of Metallurgy Engineering and Materials Science, Indian Institute of Technology Indore, Indore, IndiaInstitute of Nanotechnology, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, GermanyInstitute of Nanotechnology, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, GermanyHerbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing, ChinaKIT-TUD Joint Research Laboratory Nanomaterials, Institute of Materials Science, Technische Universität Darmstadt (TUD), Darmstadt, GermanyDepartment of Metallurgy Engineering and Materials Science, Indian Institute of Technology Indore, Indore, IndiaIn this work, the deformation behavior of as-prepared (AP) and structurally relaxed (SR) Cu–Zr–based nanoglasses (NGs) are investigated using nano- and micro-indentation. The NGs are subjected to structural relaxation by annealing them close to the glass transition temperature without altering their amorphous nature. The indentation load, p, vs. displacement, h, curves of SR samples are characterized by discrete displacement bursts, while the AP samples do not show any of them, suggesting that annealing has caused a local change in the amorphous structure. In both the samples, hardness (at nano- and micro-indentation) decreases with increasing p, demonstrating the indentation size effect. The micro-indentation imprints of SR NGs show evidence of shear bands at the periphery, indicating a heterogeneous plastic flow, while AP NG does not display any shear bands. Interestingly, the shear band density decreases with p, highlighting the fact that plastic strain is accommodated entirely by the shear bands in the subsurface deformation zone. The results are explained by the differences in the amorphous structure of the two NGs.https://www.frontiersin.org/articles/10.3389/fmats.2021.676764/fullnanoglassamorphousindentation size effectmicro-indentationstructural relaxationplastic deformation |
| spellingShingle | A Sharma Sree Harsha Nandam Horst Hahn Horst Hahn Horst Hahn K. Eswar Prasad Effect of Structural Relaxation on the Indentation Size Effect and Deformation Behavior of Cu–Zr–Based Nanoglasses Frontiers in Materials nanoglass amorphous indentation size effect micro-indentation structural relaxation plastic deformation |
| title | Effect of Structural Relaxation on the Indentation Size Effect and Deformation Behavior of Cu–Zr–Based Nanoglasses |
| title_full | Effect of Structural Relaxation on the Indentation Size Effect and Deformation Behavior of Cu–Zr–Based Nanoglasses |
| title_fullStr | Effect of Structural Relaxation on the Indentation Size Effect and Deformation Behavior of Cu–Zr–Based Nanoglasses |
| title_full_unstemmed | Effect of Structural Relaxation on the Indentation Size Effect and Deformation Behavior of Cu–Zr–Based Nanoglasses |
| title_short | Effect of Structural Relaxation on the Indentation Size Effect and Deformation Behavior of Cu–Zr–Based Nanoglasses |
| title_sort | effect of structural relaxation on the indentation size effect and deformation behavior of cu zr based nanoglasses |
| topic | nanoglass amorphous indentation size effect micro-indentation structural relaxation plastic deformation |
| url | https://www.frontiersin.org/articles/10.3389/fmats.2021.676764/full |
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