Mechanical behavior of SiC foam-SiC particles/Al hybrid composites
(1. School of Mechanical and Electrical Engineering, Nanchang University, Nanchang 330031, China;
2. Key Laboratory of Ministry of Education for Conveyance and Equipment, East China Jiaotong University,
Nanchang 330013, China;
3. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China)
2. Key Laboratory of Ministry of Education for Conveyance and Equipment, East China Jiaotong University,
Nanchang 330013, China;
3. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China)
Abstract: The hybrid SiC foam-SiC particles/Al double interpenetrating composites to be used as the brake materials of high speed train were fabricated by squeeze casting technique. The influence of the type of matrix on the mechanical properties and the fracture mechanism of the hybrid composites was investigated. The interface bond in the hybrid composites is good for the composites have the unique double interpenetrating structure. The ductile matrix resists the propagation of the microcracks in the struts. During the microcrack propagation process, the energy absorption and the fracture surface area are increased, which increases the ductility of the hybrid composites. The compressive strength of the hybrid composite reinforced by the SiC with the total volume fraction of 53% is 660 MPa, which is higher than that of traditional composite reinforced by single SiC particles.
Key words: double interpenetrating hybrid composite; fracture mechanism; energy absorption; crack deflection; mechanical behavior