The Effect of Particle Migration on the Creep-Rate of Nanocomposites

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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.

Info:

Periodical:

Key Engineering Materials (Volumes 317-318)

Edited by:

T. Ohji, T. Sekino and K. Niihara

Pages:

445-448

DOI:

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

Citation:

J.E. Pitchford et al., "The Effect of Particle Migration on the Creep-Rate of Nanocomposites", Key Engineering Materials, Vols. 317-318, pp. 445-448, 2006

Online since:

August 2006

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$35.00

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