doiSerbia

Densification, microstructure and properties of supersolidus liquid phase sintered 6711Al-SiC metal matrix composites

Padmavathi C. (Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, India)
Upadhyaya Anish (Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, India)

The present study compares the effect of SiC reinforcement on densification and properties of supersolidus liquid phase sintered 6711Al-SiC composites. The prealloyed 6711 powders were mixed with SiC ranging from 5 to 20 vol.%, compacted at 400 MPa and sintered at 630ºC under vacuum. It was shown that better densification, yield strength, wear and corrosion resistance were achieved up to 10 vol.% due to uniform distribution of SiC particles throughout matrix. Beyond 10 vol.%, SiC resulted in clustering and had detrimental effect on densification and mechanical properties. Age hardening of 6711-10SiC composites led to improvement in mechanical properties.

Keywords: 6711Al-SiC composites, sintering, densification, microstructure, mechanical and tribological properties