IJETSI

Title: EFFECT OF TRANSITION ELEMENTS ADDITIONS ON MICROSTRUCTURE AND TENSILE PROPERTIES OF A SECONDARY Al-7Si-Mg CAST ALUMINIUM ALLOY
Authors: Chrispin Ouko Zamzu, Dr. Thomas Ochuku Mbuya, Dr. Christiaan Adika Adenya, Timothy Ngigi
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Chrispin Ouko Zamzu: Department of Mechanical Engineering, Pan African University Institute for Basic Sciences, Technology and Innovation, Kenya. Dr. Thomas Ochuku Mbuya: Department of Mechanical Engineering, Pan African University Institute for Basic Sciences, Technology and Innovation, Kenya & Department of Mechanical and Manufacturing Engineering, University of Nairobi, Kenya. Dr. Christiaan Adika Adenya: Department of Mechanical Engineering, Pan African University Institute for Basic Sciences, Technology and Innovation, Kenya & Department of Mechanical Engineering, Jomo Kenyatta University of Agriculture and Technology, Kenya. Timothy Ngigi: Department of Mechanical Engineering, Jomo Kenyatta University of Agriculture and Technology, Kenya.

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Abstract: The economic and environmental benefits of recycling aluminium alloys have increased the need to consider re-designing the alloys. The key challenge in recycling Al alloys is the varied chemical composition of the Al scrap. The effect of Ti, Sr, Cu and transition elements Zr and V additions on tensile properties of secondary cast 356 Al-Si alloy has been investigated with the aim of designing and producing premium automotive parts such as cylinder heads. The secondary cast 356 Al-Si alloy (base alloy) and its variant 356 + 0.5Cu + X (X = 0.15% Ti + 0.15% Zr + 0.25% V + 0.015% Sr) was cast, HIP ped and T6 heat treated. There was notable improvement in the ultimate tensile strength (UTS) and Yield strength (YS) of the base alloy upon addition of the elements. At room temperature, the UTS improved from 224 MPa to 279.3 MPa while the YT improved from 210 MPa to 268 MPa. At high temperature (237oC), the UTS and YT improved from 149 MPa to 186 MPa and from 122 MPa to 167 MPa respectively. These improvements in strengths were however accompanied by a decrease in percent elongation, from 5% to 4.4% and from 8% to 6.8%, at room and high temperatures respectively. The decrease in ductility with the element addition can be attributed to the increased amount of course brittle intermetallic phases. At high temperature (237 0C), the strengthening phases in the base alloy undergo Ostwald ripening thus resulting in lower UTS and YT. On the other hand, the micro sized tri-aluminide phases are stable at high temperature (237oC) explaining the substantial improvement in yield strength of 36.9%.

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