The effect of particle migration on the creep-rate of nanocomposites
Journal article, 2006

The tensile creep behaviour of a mullite-SiC nanocomposite containing 5 vol% of SiC particles deformed under stresses from 4 to 50 MPa at 1400°C has been studied. After grain-size effects had been accounted for, the creep-rate of the nanocomposite was found to be approximately 30× less than that of the monolithic mullite. It is suggested that this reduction is caused not by a threshold stress but by the extra work required to drive diffusion in the low diffusivity SiC particles so that they can move with the grain boundaries during creep. A model is presented which predicts the rate of creep under these conditions and gives reasonable agreement with the experiments at low stresses.

Creep

Silicon carbide

Diffusion creep

Nanocomposites

Grain boundaries

Mullite

Author

J. E. Pitchford

University of Cambridge

E. Lidén

Swedish Ceramic Institute

Stefan Gustafsson

Chalmers, Applied Physics, Microscopy and Microanalysis

Lena Falk

Chalmers, Physics

E. Carlström

Swedish Ceramic Institute

W. J. Clegg

University of Cambridge

Key Engineering Materials

1013-9826 (ISSN)

Vol. 317-318 445-448

Subject Categories

Mineral and Mine Engineering

Applied Mechanics

Metallurgy and Metallic Materials

DOI

10.4028/www.scientific.net/kem.317-318.445

More information

Latest update

8/5/2020 2