Engineering Transactions, 68, 4, pp. 385–395, 2020

Microstructural Investigation and Wear Characteristics of Al-Si-Ti Cast Alloys

Akeel Dhahir SUBHI
University of Technology, Baghdad-Iraq

Ali Abbar KHLEIF
University of Technology, Baghdad-Iraq

University of Al-Qadisiyah, Diwaniya, Iraq

Hypoeutectic Al-7Si alloys containing various titanium proportions (0.8–1.6%) were produced and analyzed in this work. The wear characteristics of Al-Si alloys were studied under the conditions of dry sliding at various applied loads. Optical microscope (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to depict the microstructure, worn surface and phases, respectively. Phases of α-Al, eutectic and Ti9Al23 were recognized in the Al-Si-Ti alloys matrix. Considerable coarsening took place in α-Al and eutectic silicon in a fully eutectic through solidification. The hardness was increased as the titanium proportion increased. Furthermore, significant changes were found in the wear rate depending on the
titanium proportion added and load applied.
Keywords: hypoeutectic Al-Si alloy; microstructural investigation; intermetallic compound; wear characteristics
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DOI: 10.24423/EngTrans.1156.20201029