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Deformation and structural densification in Al2O3-Y2O3 glass

Paul, Arindam and Jayaram, Vikram (2011) Deformation and structural densification in Al2O3-Y2O3 glass. In: Acta Materialia, 59 (1). pp. 82-92.

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Official URL: http://dx.doi.org/10.1016/j.actamat.2010.09.010

Abstract

In this article, we examine the unusual plastic deformation under uniaxial compression of an Al2O3-15 mol % Y2O3 (A15Y) glass synthesized by a wet chemical route At a low temperature of 650-725 degrees C, plastic deformation of this glass is largely non-viscous through shear instabilities In contrast deformation near the crystallization temperature (850 degrees C) occurs homogeneously with work hardening and with a monotonic increase in the true density of the glass by 10-12% accompanied by an increase in hardness (H) and elastic modulus (E) of up to 100% We hypothesize a phenomenon of molecular densification of the amorphous structure through a hierarchy of multiple phases, analogous to density- or entropy-driven amorphous to-amorphous phase transitions (polyamorphism) These results suggest that the present method of preparation and the unusual behavior can trigger a search for many more systems that display such behavior (C) 2010 Acta Materialia Inc Published by Elsevier Ltd All rights reserved

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Amorphous oxides; Plastic deformation; Amorphous to amorphous transition; Shear bands
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 22 Dec 2010 08:55
Last Modified: 22 Dec 2010 08:55
URI: http://eprints.iisc.ernet.in/id/eprint/34592

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