Fracture toughness of SiCp/6061-T6 composite.
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概要
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Metal matrix composite fractures in a complicated manner such as exfoliation between matrix and reinforcement or failure of reinforcements. Therefore, evaluation of fracture toughness becomes important for the application as structural materials especially from the view point of the guarantee of higher security. In this study, the effect of volume fraction of SiC particles on the fracture toughness and fracture mechanism of 6061 aluminum alloys reinforced with SiC particles (SiCp/6061-T6 composites) manufactured by powder metallurgy process were investigated by characterizing with fractography and microstructure. It was found that dynamic fracture toughness and crack propagation toughness were remarkably decreased with increasing the content of SiC particle. Furthermore, volume fraction of SiC particles in SiCp/6061-T6 composites showed a great influence on the crack propagation toughness. The micromechanism of the fracture process in the lower volume fraction of SiC particle was concluded as follows: 1, voids were formed at the ends of SiC particles, 2. voids grew and coalescenced, and then crack propagated. Stable voids growth was difficult with increasing SiC particles. Eventually the rapid unstable fracture occurred.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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