Paper Title:
Experimental Characterization and Computational Simulation of Glass-Alumina Functionally Graded Surfaces
  Abstract

Functionally graded materials are a new and attractive class of materials incorporating an engineered spatial variation in composition and/or microstructure: this idea has immediately revealed successful since it allows to reach peculiar mechanical properties such as resistance to wear and contact damage. As a matter of fact, the final behaviour of a Functionally Graded Material is mainly influenced by its graded composition and/or microstructure. Therefore a good fabrication technique should provide a high control and reproducibility of the spatial variation in composition and/or microstructure; on the other hand, a reliable model should take into account the gradient in order to accurately predict the final behaviour of a Functionally Graded Material. The present study is focused on glass-alumina FGMs: the compositional variation, which occurs along only one direction, has been realized through percolation of a molten glass into a bulk polycrystalline alumina. The resulting Functionally Graded Coatings have been carefully characterized through Scanning Electron Microscopy, X-ray diffraction, classical mechanical tests and analysis. Moreover, their behaviour has been modeled by means of a microstructure-based FEM method. A great attention has been paid to the validation of the computational model on the basis of the experimental data. Furthermore, the experimental and the computational approaches have been combined in order to define the correlation between fabrication parameters, such as time and temperature, and resulting gradients in composition and microstructure as well as related performances. Since changes in material properties can be easily evaluated, the resulting model may be useful to simulate the material response to a given thermo-mechanical loading and to tailor the gradient as a function of the specific application.

  Info
Periodical
Materials Science Forum (Volumes 492-493)
Edited by
Omer Van der Biest, Michael Gasik, Jozef Vleugels
Pages
647-652
DOI
10.4028/www.scientific.net/MSF.492-493.647
Citation
V. Cannillo, T. Manfredini, M. Montorsi, C. Siligardi, A. Sola, "Experimental Characterization and Computational Simulation of Glass-Alumina Functionally Graded Surfaces", Materials Science Forum, Vols. 492-493, pp. 647-652, 2005
Online since
August 2005
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Valeria Cannillo, Luca Lusvarghi, Tiziano Manfredini, M. Montorsi, Cristina Siligardi, A. Sola
Abstract:The present work was focused on glass-alumina functionally graded materials. The samples, produced by plasma spraying, were built as...
227