Plastically deforming amorphous $ZrO_2-Al_2O_3$

Gandhi, AS and Jayaram, V (2003) Plastically deforming amorphous $ZrO_2-Al_2O_3$. In: Acta Materialia, 51 (6). pp. 1641-1649.

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Abstract

We report for the first time non-viscous, plastic deformation in an amorphous oxide: $ZrO_2-Al_2O_3$. Dense samples of amorphous $ZrO_2-Al_2O_3$ made by hot pressing spray-pyrolysed powder were deformed in uniaxial compression at 600–700°C at strain rates from $6\times10^{-5}\hspace{2mm}s^{-1}\hspace{2mm}to\hspace{2mm}10^{-3}\hspace{2mm}s{-1}$. A transition from elastic to plastic deformation occurred at a critical stress ~360 MPa. The onset of plastic deformation was associated with a drop in the stress by 20–25%. Little influence of strain and strain rate on the flow stress was observed. The non-viscous, plastic deformation is related to the open structure of the amorphous phase as indicated by its low true density.

Item Type:	Journal Article
Publication:	Acta Materialia
Publisher:	Elsevier
Additional Information:	Copyright of this article belongs to Elsevier.
Keywords:	Amorphous oxides;Plastic deformation;Shear bands; Compression test
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	02 Jun 2006
Last Modified:	19 Sep 2010 04:28
URI:	http://eprints.iisc.ac.in/id/eprint/7331

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