Abstract:

In this study, Al86-xMg10Ti4Bx (x=1, 2, 3 and 4) alloys were produced by casting, and their microstructure, thermal and mechanical properties were investigated extensively. The microstructural properties of the alloys were characterized by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), and Energy Dispersive X-ray Spectroscopy (EDX). Composition ratios were studied using an X-ray fluorescence Spectrometer (XRF). The thermal behaviors were evaluated by differential scanning calorimetry (DSC) analysis. Mechanical properties were investigated by Vickers microhardness (HV) measurement and tensile test. In the XRD analysis of the alloys, phases such as α-Al, β-Al3Mg2, Al3Ti and AlB2 were detected. SEM images showed that the microstructure of the alloys mainly consisted of rod-like and dendritic structures. It has been determined that the alloys are produced by their nominal composition and are homogeneous. In the DSC analysis results, an endothermic peak was observed at 660 °C, representing aluminum's melting temperature only. In the tensile strength and microhardness results of the alloys, the highest tensile strength was determined as 199.96 MPa for the Al85Mg10Ti4B1 alloy and 207.4 HV for the Al82Mg10Ti4B4 alloy. This study determined that the increase in the boron ratio in AlMgTiB alloys caused an increase in hardness values but a decrease in tensile strength.

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