Abstract
To investigate the effects of micron heterogeneous metal particles on the microstructure and mechanical properties of 7075Al hybrid composites, Ni based particles and Ti based particles in the same size were incorporated into SiCp/7075Al composites using squeeze casting separately. The interfacial structure and mechanical property relationship of the hybrid composites was investigated using SEM, TEM, XRD and tensile tests. And the strengthening effects of heterogeneous metal particles were discussed. Results shown that different interfacial structures have been formed at the interface of the metal particles during the casting processes. Ni based particles formed low-temperature NiAl3 intermetallic reaction layers. In contrast, only Ti–Al interdiffusion metallurgical bonding were detected at the interface of the Ti based particles. The composites incorporated with Ti based particles achieved higher tensile strength and plasticity of 573 MPa and 0.65%, respectively. The interdiffusion metallurgical bonding prove to be a more desired interfacial structure and would ensure the strengthening effects of metal particles.
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