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Viscous Poisson's coefficient determined by discontinuous hot forging

Published online by Cambridge University Press:  31 January 2011

Ruzhong Zuo ,
Emil Aulbach  and
Jürgen Rödel
Ruzhong Zuo*
Affiliation:
Institute of Materials Science, University of Technology, Darmstadt Petersenstr. 23, D-64287 Darmstadt, Germany
Emil Aulbach
Affiliation:
Institute of Materials Science, University of Technology, Darmstadt Petersenstr. 23, D-64287 Darmstadt, Germany
Jürgen Rödel
Affiliation:
Institute of Materials Science, University of Technology, Darmstadt Petersenstr. 23, D-64287 Darmstadt, Germany
*
a) Address all correspondence to this author. e-mail: zuo@ceramics.tu-darmstadt-de
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Abstract

A high-resolution laser-assisted loading dilatometer was applied for the precise measurement of radial and axial strain rates under different uniaxial loads, using alumina as a model material. As a continuous application of an external load can lead to an anisotropic microstructure, a discontinuous hot forging technique was utilized to determine the viscous Poisson's coefficient. In these studies, samples were presintered to different densities and only then were hot-forging tests performed. The result provides an isotropic viscous Poisson's coefficient, which increases smoothly between 0.21 and 0.42 within the accessible density range. Combined with the uniaxial viscosity measured before using the same technique, the hydrostatic sintering stress, bulk viscosity, and shear viscosity as a function of density are now available for solid-state sintering. A comparison of the experimentally obtained results with several theoretical models is included.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 9 , September 2003 , pp. 2170 - 2176
Copyright
Copyright © Materials Research Society 2003

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