Journal
MATERIALS & DESIGN
Volume 45, Issue -, Pages 241-252Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2012.09.002
Keywords
Cast metal matrix composites; Crack initiation; Crack propagation; Low cycle fatigue
Categories
Funding
- Ministry of Education, Science, Sports and Culture of the Government of Japan
- Grants-in-Aid for Scientific Research [23560082] Funding Source: KAKEN
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Metal matrix composites (MMCs) suffer cyclic plastic deformation in the structural application. Microcrack initiation and early propagation during low cycle fatigue were studied in three types of materials: cast hybrid MMC with SiC particles and Al2O3 whiskers, cast MMC with Al2O3 whiskers, and cast Al alloy. Furthermore, the role of hybrid reinforcement in the mechanisms of microcrack initiation and early propagation were examined. In Al alloy, microcracks were observed to initiate in the Al grain, but when the matrix was reinforced, the initiation location changed to the whisker/matrix and particle/matrix interfaces and the hybridization effect reduced the resistance to crack initiation. Moreover, the two MMC materials exhibited similar interface debonding in fracture, which created additional secondary microcracks due to continued fatigue cycling. Numerous voids were formed ahead of the crack tip, and the microcracks intersected with other nearby microcracks. However, in the Al alloy, the microcracks propagated through the boundaries between Si particle clusters and the Al grain through void nucleation and coalescence or through striation formation in the Al grain. (C) 2012 Elsevier Ltd. All rights reserved.
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