Mechanical Properties and Fatigue Crack Propagation Behavior of Hybrid Metal Matrix Composites

960577

02/01/1996

Event
International Congress & Exposition
Authors Abstract
Content
The objective of this study is to investigate mechanical properties and fatigue crack propagation behavior in hybrid metal matrix composites by squeeze infiltration method (15% Al2O3 + SiCw/6061Al). The mechanical properties of Al2O3+SiCw/Al composites including tensile strength, yield strength, Young's modulus, were improved compared with those of unreinforced alloy and Al203/Al composites. The hybrid composites were more ductile than Al2O3/Al composites. Fatigue crack propagation rates of both Al2O3/Al and Al2O3+SiCw/Al composites showed a similar behavior in region II. Their propagation rates were higher in entire ▵K region compared with that of 6061 Al alloy. From the crack path morphology, fatigue cracks propagated linearly and smoothly in 6061 Al alloy. However, in the metal matrix composites cracks tend to avoid the reinforcements promoting crack deflection. It was observed that crack deflection enhanced crack closure due to wedging phenomenon. The effects of crack closure level, Kcl/Kmax were indicated by the relations with ▵K. Differences in crack propagation mechanism between 6061 Al alloy and metal matrix composites were discussed through the fractographic study.
Meta TagsDetails
DOI
https://doi.org/10.4271/960577
Pages
13
Citation
Lee, B., Lim, T., Song, J., and Han, K., "Mechanical Properties and Fatigue Crack Propagation Behavior of Hybrid Metal Matrix Composites," SAE Technical Paper 960577, 1996, https://doi.org/10.4271/960577.
Additional Details
Publisher
Published
Feb 1, 1996
Product Code
960577
Content Type
Technical Paper
Language
English