Journal
PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL
Volume 22, Issue 2, Pages 153-159Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.pnsc.2012.03.009
Keywords
Metal matrix composites; Squeeze casting; Fatigue; Fracture; Temperature
Funding
- China Postdoctoral Science Foundation [20090461201]
- Shandong Province Postdoctoral Innovation fund [200903059]
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The strain amplitude-controlled fatigue characteristics of an Al-Si casting alloy and its composite reinforced with 17 vol% Al2O3 fibers (Al-Si/Al2O3) are studied at three different temperatures. Both the alloy and the composite showed different degrees of cyclic softening at elevated temperatures. Increasing the temperature, fatigue damage of either the alloy or the composite occurred with varying mode from brittle fracture of silicon particles to their separation from the aluminum matrix. This is explained by the different thermal expansion coefficients of silicon particles and the aluminum matrix. The reinforcement Al2O3 fibers in the composite showed a similar damage behavior with those silicon particles despite temperature variation. (C) 2012. Chinese Materials Research Society. Production and hosting by Elsevier Ltd. All rights reserved.
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