Paper number 634

EFFECT OF SIC REINFORCEMENT ON MECHANICAL PROPERTIES OF SIC/AL METAL MATRIX COMPOSITES |

**Ho J. Ryu ^{1}, Hyun K. Jung^{2} and Soon H. Hong^{1}**

*1 Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 373-1, Kusung-dong, Yusung-gu, Taejon 305-701, Korea2 Korea Atomic Energy Research Institute, 150, Dukjin-dong, Yusung-gu, Taejon 305-353, Korea*

Summary |
Volume fraction of SiC particles in SiCp/2124Al composite was varied from 10 to 30 vol% and extrusion ratio of 20 vol% SiCw/2124Al was varied from 12:1 to 70:1 to investigate the effects of volume fraction, aspect ratio and misorientation angle of reinforcements on mechanical properties of SiC/2124Al composites. A new concept of effective aspect ratio was proposed, combining the effects of aspect ratio and alignment of reinforcement, as a new parameter indicating the load transfer efficiency of misaligned reinforcement in metal matrix composite. The elastic modulus of SiCp/2124Al composite increased with increasing the volume fraction of SiC particles in 2124Al matrix. The anisotropy in elastic modulus of SiCw/2124Al composite increased with increasing the extrusion ratio of consolidated SiCw/2124Al billet. The magnitude and anisotropy of yield strength of SiC/2124Al composite could be estimated more accurately by substituting the average aspect ratio by effective aspect ratio in the shear-lag model. |

Keywords |
metal matrix composite, silicon carbide, mechanical properties, yield strength, elastic modulus, load transfer, anisotropy |

Theme : Metal Matrix Composites ; Characterisation and Modelling