Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1579833 | Materials Science and Engineering: A | 2010 | 8 Pages |
Abstract
Creep behavior of metal matrix composites is similar to dispersion strengthen alloys and characterized by the presence of a threshold stress below which the creep rate is negligible. This threshold stress is attributed, at least in dispersion-strengthened alloys, to dislocation particle interactions in which the detachment of the dislocations from the particle is the rate-limiting step. Creep experiments were performed on an Al-5Y2O3-10SiC composite in the temperature range of 473 and 573Â K and the nature of the dislocation-particle interaction was determined by performing in situ straining experiments at elevated temperature in a transmission electron microscope. The threshold stress and the detachment stress are temperature dependent and the detachment stress is less than the threshold stress emphasizing the contribution of load transfer from the matrix to the reinforcement phase.
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Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
S.P. Deshmukh, R.S. Mishra, I.M. Robertson,