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A new mechanism for ISE in alumina shock deformed at 6.5 GPa

IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata


Field	Value

Title	A new mechanism for ISE in alumina shock deformed at 6.5 GPa

Creator	Chakraborty, Riya Dey, A Mukhopadhyay, Anoop Kumar Joshi, K D Rav, A Ghosh, J Mandal, Ashok Kumar Bysakh, Sandip Biswas, Sampad Kumar Gupta, S C

Subject	Engineering Materials

Description	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.

Publisher	IOP PUBLISHING LTD

Date	2012

Type	Conference or Workshop Item PeerReviewed

Format	application/pdf

Identifier	http://cgcri.csircentral.net/1815/1/riya2.pdf Chakraborty, Riya and Dey, A and Mukhopadhyay, Anoop Kumar and Joshi, K D and Rav, A and Ghosh, J and Mandal, Ashok Kumar 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.

Relation	http://cgcri.csircentral.net/1815/