Effects of TiO2 coating on microstructure and mechanical properties of magnesium matrix composite reinforced with Mg2B2O5w

The interface between the reinforcement and the matrix is very important for metal matrix composites. The effects of TiO2 coating on microstructure and mechanical properties of Mg2B2O5w-reinforced AZ91D magnesium matrix composite fabricated by squeeze casting technique were studied. The results indicate the flexural strength and flexural modulus of Mg2B2O5w/TiO2/AZ91D composite is 40% and 35% up on that of Mg2B2O5w/AZ91D composite. The reason is that the MgO interfacial product resulting from the reaction between the TiO2 coating and the liquid Mg can enhance the interfacial bonding strength and increase the load transfer from the matrix to the reinforcement, which leads to higher mechanical properties of Mg2B2O5w/TiO2/AZ91D composite.