Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 67, Issue 7-8, Pages 1719-1726Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2006.06.020
Keywords
metal matrix composites (MMCs); fracture toughness; fatigue crack growth; damage tolerance
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Funding
- National Research Foundation of Korea [과C6A1807] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We have studied the effects of short-fiber/particle hybrid reinforcement on fracture toughness and fatigue crack growth in metal matrix composites. Reinforcement hybridization was achieved by a hybrid preform process, and composites were fabricated by the squeeze casting method. A16061 matrix alloy and four composites having different short-fiber/particle ratio were tested. The fracture toughness (K-IC) and the fatigue threshold (Delta K-th) increased with increasing particle contents, whereas the Paris' exponent (m) was insensitive to the short-fiber:particle ratio. These results emerged as a shift of the crack growth curve which implies on enhanced crack resistance over the entire stress intensity factor range. The positive aspect of particulate reinforcement is advocated by comparison of microstructural variables, and by observation of the crack path and surfaces. The characteristics of hybrid composites in damage tolerance are emphasized. (c) 2006 Elsevier Ltd. All rights reserved.
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