@inproceedings{95b8f216edb64a63a5c8c8ad82f87b61,
title = "The origin of superhardness in nanocomposite coatings: Analysis of nanoindentation and scratch tests",
abstract = "Nanocomposite coatings characterized by superhardness exhibit unique microstructures and deformation mechanisms at the nanometre scale. Based on the studies of nanoindentation 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.",
keywords = "Acoustic emission, Nanoindentation, Size effect, Superhard coatings",
author = "Chunsheng Lu and Mai, {Yiu Wing} and Shen, {Yao Gen}",
year = "2007",
doi = "10.1007/978-1-4020-5624-6_5",
language = "English",
isbn = "1402056230",
series = "Solid Mechanics and its Applications",
publisher = "Springer Verlag",
pages = "39--49",
booktitle = "IUTAM Symposium on Mechanical Behavior and Micro-Mechanics of Nanostructured Materials - Proceedings of the IUTAM Symposium",
address = "Germany",
note = "IUTAM Symposium on Mechanical Behavior and Micro-Mechanics of Nanostructured Materials ; Conference date: 27-06-2005 Through 30-06-2005",
}