Effect of Shear Stress, Corrosion Behavior, and Microstructural Analysis of Al7075-B₄C-TiO₂ Hybrid Metal Matrix Composite Fabricated by Electro-magnetic Stir Casting
Abstract
The present work delves into how the phenomena of shear stress and corrosion affect the structure of a hybrid metal matrix composite (HMMC) fabricated from the Al-7075 alloy strengthened with titanium dioxide (TiO2) and boron carbide (B4C) particles. To achieve better homogeneity and distribution of the reinforcements in the matrix, the electromagnetic stir casting method was employed to manufacture the composite. The plasticity and failure mechanisms of the composite are characterized by testing specimens subjected to different shear stress conditions. On the other hand, corrosion activity in 3.5% NaCl solution was analyzed to investigate how catalysts affect the electrochemical stability of the alloy. Due to increased bonding and microstructural modification, shear strength is significantly increased due to the synergistic effect of B₄C and TiO₂. Nevertheless, the synergy of the two reinforcement types led to a complex response of corrosion resistance, with TiO2 affecting the general corrosion rate while B₄C facilitating the formation of the passive layer. The results demonstrate the importance of controlling mechanical stress and corrosion resistance, which also provides valuable information for applications in the aerospace, marine and aviation industries.