Effect of Boron Addition on the Microstructure, Thermal, and Mechanical Properties of Al-5%Mg-2%Ti Alloy

In this study, Al_93-xMg₅Ti₂B_x(x = 1,2,3,4%) quaternary alloys are produced by casting techniques. The microstructure properties of the alloys were performed by x-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive x-ray spectroscopy (EDS) analysis. Differential scanning calorimetry (DSC) investigated the alloys’ thermal properties. The mechanical properties of alloys were performed by Vickers microhardness and tensile tests. In addition, tensile tests were performed on alloys, and SEM images of the rupture surface were obtained. The XRD analysis results of the alloys produced α-Al, β-Al₃Mg₂, Al₁₂Mg₁₇, Al₃Ti, and AlB₂ phases were observed. SEM and EDS analysis of the alloys showed that the distribution of the phases was homogeneous. It was determined that, adding boron to the ingot alloys caused an increase in the Vickers microhardness value and tensile strength of the alloy. Tensile test fracture surface SEM images showed a brittle and brittle fracture appearance.