期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 527, 期 9, 页码 2390-2397出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2009.12.015
关键词
In situ TEM; Dislocation-particle interaction; Creep; Threshold stress
类别
资金
- National Science Foundation [DMR-0100780]
- Department of Energy
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-5Y(2)O(3)-10SiC Composite in the temperature range of 473 and 573 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. (C) 2009 Elsevier B.V. All rights reserved.
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