Investigation on the microstructures and corrosion properties of in-situ TiC-TiB2/Al-12Si hybrid aluminum matrix composites

Abstract:

In-situ TiC-TiB2/Al-12Si hybrid aluminum matrix composites were fabricated by laser deposition. The microstructures and corrosion properties of in-situ TiC-TiB2/Al-12Si hybrid aluminum matrix composites were analysized by XRD、OM、SEM、TEM and electrochemical test. The results show that the in-situ TiC particles with fine and uniform polygons and the TiB2 particles with rod-like can act as the heterogeneous nucleation core of α-Al phase to refine grains. With the increasing of in-situ TiC-TiB2 particles, the corrosion potential shifts positively, the corrosion current density decreases significantly, and the impedance modulus and phase angle increases gradually, indicating that the in-situ TiC-TiB2/Al-12Si hybrid aluminum matrix composites has better corrosion resistance.