Deformation and structural densification in Al2O3-Y2O3 glass

Paul, Arindam ; Jayaram, Vikram (2011) Deformation and structural densification in Al2O3-Y2O3 glass Acta Materialia, 59 (1). pp. 82-92. ISSN 1359-6454

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related 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 °C, plastic deformation of this glass is largely non-viscous through shear instabilities. In contrast, deformation near the crystallization temperature (850 °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.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Amorphous Oxides; Plastic Deformation; Amorphous-to-amorphous Transition; Shear Bands
ID Code:63043
Deposited On:24 Sep 2011 15:01
Last Modified:24 Sep 2011 15:01

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