The origin of superhardness of nanocomposite coatings: analysis of nanoindentation and scratch tests
Nanocomposite coatings characterized by superhardness exhibit unique microstructures and deformation mechanisms at the nanometre scale. Based on the studies of nano-indentation size effect, we show that dislocation-based deformation is gradually replaced by grain-boundary mediated deformation as the...
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| Format: | Conference Paper |
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Springer
2007
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| Online Access: | http://www.springer.com/east/home/engineering?SGWID=5-175-22-173701716-detailsPage=ppmmedia%7Ctoc http://hdl.handle.net/20.500.11937/41359 |
| _version_ | 1848756123915517952 |
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| author | Lu, Chunsheng Mai, Y. Shen, Y. |
| author2 | Y. L. Bai |
| author_facet | Y. L. Bai Lu, Chunsheng Mai, Y. Shen, Y. |
| author_sort | Lu, Chunsheng |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Nanocomposite coatings characterized by superhardness exhibit unique microstructures and deformation mechanisms at the nanometre scale. Based on the studies of nano-indentation size effect, we show that dislocation-based deformation is gradually replaced by grain-boundary mediated deformation as the hardness of coatings increases, especially for coatings approaching superhardness. The measured hardness of a superhard coating exponentially increases with the decrease of indentation depth, and its intrinsic hardness can be exactly determined by the analysis of indentation size effect. The optimal conditions extracted from acoustic emission signals from scratching superhard nanocomposite coatings are in good agreement with nanoindentation and drilling tests. In the optimal regime, it is the competition between different deformation mechanisms that results in the origin of superhardness in self-organized microstructures of nanocomposite coatings. |
| first_indexed | 2025-11-14T09:07:12Z |
| format | Conference Paper |
| id | curtin-20.500.11937-41359 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:07:12Z |
| publishDate | 2007 |
| publisher | Springer |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-413592022-11-21T05:19:42Z The origin of superhardness of nanocomposite coatings: analysis of nanoindentation and scratch tests Lu, Chunsheng Mai, Y. Shen, Y. Y. L. Bai Q. S. Zheng Y. G. Wei size effect acoustic emission nanoindentation superhard coatings Nanocomposite coatings characterized by superhardness exhibit unique microstructures and deformation mechanisms at the nanometre scale. Based on the studies of nano-indentation size effect, we show that dislocation-based deformation is gradually replaced by grain-boundary mediated deformation as the hardness of coatings increases, especially for coatings approaching superhardness. The measured hardness of a superhard coating exponentially increases with the decrease of indentation depth, and its intrinsic hardness can be exactly determined by the analysis of indentation size effect. The optimal conditions extracted from acoustic emission signals from scratching superhard nanocomposite coatings are in good agreement with nanoindentation and drilling tests. In the optimal regime, it is the competition between different deformation mechanisms that results in the origin of superhardness in self-organized microstructures of nanocomposite coatings. 2007 Conference Paper http://hdl.handle.net/20.500.11937/41359 http://www.springer.com/east/home/engineering?SGWID=5-175-22-173701716-detailsPage=ppmmedia%7Ctoc Springer restricted |
| spellingShingle | size effect acoustic emission nanoindentation superhard coatings Lu, Chunsheng Mai, Y. Shen, Y. The origin of superhardness of nanocomposite coatings: analysis of nanoindentation and scratch tests |
| title | The origin of superhardness of nanocomposite coatings: analysis of nanoindentation and scratch tests |
| title_full | The origin of superhardness of nanocomposite coatings: analysis of nanoindentation and scratch tests |
| title_fullStr | The origin of superhardness of nanocomposite coatings: analysis of nanoindentation and scratch tests |
| title_full_unstemmed | The origin of superhardness of nanocomposite coatings: analysis of nanoindentation and scratch tests |
| title_short | The origin of superhardness of nanocomposite coatings: analysis of nanoindentation and scratch tests |
| title_sort | origin of superhardness of nanocomposite coatings: analysis of nanoindentation and scratch tests |
| topic | size effect acoustic emission nanoindentation superhard coatings |
| url | http://www.springer.com/east/home/engineering?SGWID=5-175-22-173701716-detailsPage=ppmmedia%7Ctoc http://hdl.handle.net/20.500.11937/41359 |