On the Strength of Silicon Carbide Particulate Reinforced Aluminium Alloy Matrix Composites

Abstract

Abstract: In the present study, the modified continuum model, quench strengthening and dislocation pile-up model was respectively used to estimate the yield strength of SiCp/Al composites. The experimental results showed that the modified shear lag model or quench strengthening model would underestimate the yield strength of SiCp/Al composites. However, the modified Hall-Petch correlation on the basis of the dislocation pile-up model, expressed as σcy = 244 + 371λ-1/2, fitted very well with the experimental data, which indicated that the strength increase of SiCp/Al composites might be due to the direct blocking of dislocation motion by the particulate-matrix interface. Namely, the dislocation pile-up is the most possible strengthening mechanism for SiCp/Al composites.

Key words: Silicon carbide particulate, Composites, Shear lag model, Quench strengthening model...

Mingjiu ZHAO, Yue LIU, Liqing CHEN, Jing BI. On the Strength of Silicon Carbide Particulate Reinforced Aluminium Alloy Matrix Composites[J]. J Mater Sci Technol, 2004, 20(04): 451-453.

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