Bhattacharya, Manjima and Chakraborty, Riya and Dey, Arjun and Mandal, Ashok Kumar and Mukhopadhyay, Anoop Kumar (2012) Improvement in nanoscale contact resistance of alumina. Applied Physics A-Materials Science & Processing, 107 (4). pp. 783-788. ISSN 0947-8396

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In all contact-related applications such as the wear-resistant inserts, biomedical implants, high strain rate impact-resistant plates, etc., nanohardness, i.e. the intrinsic contact resistance at the nano scale, plays a major role. In spite of the wealth of literature, the studies on nanohardness of dense, coarse-grain alumina ceramics which represent many commercial varieties; have reasonably good hardness at the macro scale and characteristically exhibit R-curve behaviour, are far from significant. Here, to the best of our knowledge, we report for the first time the experimental observations of the increase in intrinsic contact resistance at the nano scale with the loading rate applied to a high-density (similar to 95 % of theoretical) coarse-grain (similar to 20 A mu m) alumina ceramics. These observations were explained in terms of the initiation of nanoscale plasticity and maximum shear stress generated just underneath the nanoindenter.

Item Type: Article
Subjects: Engineering Materials
Depositing User: Bidhan Chaudhuri
Date Deposited: 26 Jul 2012 10:57
Last Modified: 26 Jul 2012 10:57

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