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High Temperature Background Characterization of Internal Friction for Fine-Grained Nickel/Zirconia Composite

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Abstract:

A mechanical spectroscopy study has been made on fine-grained Ni-10vol%TZP(ZrO2-3mol.%Y2O3) composite in an attempt to assess the following micromechanical prediction. A dual-phase material with fine-grained constituents deforming by Coble-type boundary-diffusion creep exhibits viscoelastic behavior. Dynamic Young's modulus and internal friction are measured over a temperature range of 25 to 800oC at frequencies of 0.01, 0.05 and 0.1Hz using a specially designed tension-compression apparatus. Two relaxation peaks are observed in the composite. An exponential involved in the peak and background components are determined and, by making a further analysis based on the micromechanical formulation and also taking the well-known relaxation due to viscous grain-boundary sliding into account, the implications of these quantities are discussed in terms of constituent material parameters(boundary diffusivity, grain size, etc.).

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Periodical:

Materials Science Forum (Volumes 449-452)

Pages:

885-888

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.449-452.885

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Online since:

March 2004

Authors:

Chang Seog Kang, Sung Kil Hong

Keywords:

Diffusion Creep, Dynamic Young's Modulus, Grain Boundary Sliding (GBS), High Temperature Background, Internal Friction Peak, Micromechanical Model, Ni-TZP Composite, Viscoelasticity

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© 2004 Trans Tech Publications Ltd. All Rights Reserved

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