Abstract
The effect of reinforcement size and volume fraction on fracture toughness in powder metallurgy (P/M)- processed 6061Al alloy matrix composites with different kinds of reinforcements (Si 3 N 4 whiskers, and SiC particles) are analyzed. The acoustic emission ( AE ) activities has also been investigated during three point bending fracture toughness test. Comparing the fracture toughness results in MMCs containing different volume fractions (V f ) of whiskers and particles show higher fracture toughness in materials with lower V f . On the other hand, the fracture behavior in 10 percent reinforced composites regardless of the type of reinforcement, particle or whisker, is ductile fracture, but it is semi- brittle in the case of 30 percent reinforced materials. Regarding the amplitude and the number of AE events during three point bending fracture toughness test, 30 percent reinforced materials with brittle fracture mode show very high amplitude signals with less number of events in the onset of plastic deformation. 10 percent reinforced composites with a ductile mode fracture show lower AE amplitude and higher number of events. Totally, a kind of interaction between the different parameters like volume fraction, reinforcement type and reinforcement size on the fracture behavior of 6061 Al alloy matrix composites are observed and discussed.
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