Chakraborty, Riya and Dey, A and Mukhopadhyay, Anoop Kumar and Joshi, K D and Rav, A and Ghosh, J and Mandal, A K and Bysakh, Sandip and Biswas, Sampad Kumar and Gupta, S C (2012) A new mechanism for ISE in alumina shock deformed at 6.5 GPa. In: 23rd International Conference on High Pressure Science and Technology (AIRAPT), SEP 25-30, 2011, Bhabha Atomic Research Centre (BARC), Mumbai, INDIA.

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Abstract

With a view to understand how high strain rate flyer plate impact affects the nanohardness of a coarse (10 mu m) grain high density (3.978 gm.cc(-1)) alumina, load controlled nanoindentation experiments were conducted with a Berkovich indenter on as received alumina (ARA) and shocked alumina fragments (SA) of obtained from a flyer plate shock impact study at 6.5 GPa. The results showed that the nanohardness of the shocked alumina (SA) samples was much lower than that of the as received alumina (ARA) samples and that the indentation size effect (ISE) was mild in the ARA but quite severe in the SA samples. Extensive additional characterization by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and a physical model based analysis of the experimental load depth data were utilized to provide a new explanation for the presence of strong indentation size effect in the shock recovered alumina.

Item Type: Conference or Workshop Item (Paper)
Additional Information: 23rd International Conference on High Pressure Science and Technology (AIRAPT), Bhabha Atom Res Ctr (BARC), Mumbai, INDIA, SEP 25-30, 2011
Subjects: Engineering Materials
Divisions: UNSPECIFIED
Depositing User: Bidhan Chaudhuri
Date Deposited: 05 Nov 2012 13:38
Last Modified: 05 Nov 2012 13:38
URI: http://cgcri.csircentral.net/id/eprint/1815

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