Chakraborty, Riya and Dey, Arjun and Mukhopadhyay, Anoop K. and Joshi, Keshaw D and Rav, Amit and Mandal, Ashok Kumar and Bysakh, Sandip and Biswas, Sampad Kumar and Gupta, Satish C (2012) Nanohardness of Sintered and Shock Deformed Alumina. Metallurgical and Materials Transactions A-Physical Metallurg and Materials Science, 43A (2). pp. 459-470. ISSN 1073-5623

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To understand how high-strain rate, flyer-plate impact affects the nanohardness of a coarse (similar to 10 mu m) grain, high-density (similar to 3.978 gm cc(-1)) alumina, load controlled nanoindentation experiments were conducted with a Berkovich indenter on as-sintered disks and shock-recovered alumina fragments obtained from an earlier flyer-plate shock impact study. The nanohardness of the shock-recovered alumina was much lower than that of the as-sintered alumina. The indentation size effect was severe in the shock-recovered alumina but only mild in the as-sintered alumina. Extensive additional characterization by field emission scanning electron microscopy, transmission electron microscopy, and analysis of the experimental load depth data were used to provide a new explanation for the presence of strong indentation size effect in the shock-recovered alumina. Finally, a qualitative model was proposed to provide a rationale for the whole scenario of nanoindentation responses in the as-sintered and shock-recovered alumina ceramics.

Item Type: Article
Subjects: Engineering Materials
Depositing User: Bidhan Chaudhuri
Date Deposited: 28 May 2012 08:02
Last Modified: 28 May 2012 08:02

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