The superior ductility of fine SiC _p/Al2014 composites after extrusion

摘要

This paper studied the effect of extrusion on the microstructures and tensile properties of 4 vol.% 5 μm SiC_(p)/Al2014 composites fabricated by stir casting. It has been found that extrusion could refine the α-Al grains, increase the distributed homogeneity of SiC particles, decrease the porosity of the composites, and improve the interfacial bonding strength. The tensile properties, especially the ductility, of the fine SiC_(p)/Al2014 composites were significantly improved by extrusion. Compared with the as-cast 4 vol.% 5 μm SiC_(p)/Al2014 composites, the yield strength, ultimate tensile strength, and fracture strain of the extruded composites increased from 242 MPa, 367 MPa, and 3.8% to 304 MPa, 530 MPa, and 11.2%, which were increased by 25.6%, 44.4%, and 195%, respectively.