Mechanical properties of intermetallic compounds for automotive applications

Zaiful Hakim, Khairul Firdaus (2018) Mechanical properties of intermetallic compounds for automotive applications. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Micro leakage air leak out from the tyre is a phenomenon that is out of control. This situation can lead to harm such as road accidents. Therefore, airless tyre is proposed to solve the problem. Airless tyre receives more pressure than the normal tyre since it does not have cushion effect from air compared to normal tyre. Since airless tyre obtained a higher pressure than normal tyre, better material at the wheel hub of airless tyre need to be proposed to improve the tyre‟s performance. Hence, intermetallic material of Ni3Al alloy was chosen to be used as the material at the wheel hub of airless tyre. Attractive properties of Ni3Al alloy such as low density, high corrosion resistance, combined with their ability to retain strength and stiffness at elevated temperatures lead to its selection. In this research, the samples of Ni3Al alloy were prepared at four different heat treatment conditions. The main objectives of this research were to obtain the mechanical properties such as tensile strength and hardness which was tested using Universal Testing Machine (UTM) and Vickers microhardness tester. By using X-Ray Diffraction (XRD), the crystal structure of Ni3Al alloy was confirmed as FCC. The dendrites structure and precipitates was observed on Ni3Al alloy by using optical microscope (OM) and scanning electron microscope (SEM). The quantities of dendrites and precipitates decrease with higher heat treatment temperature. The hardness of Ni3Al alloy increased with the heat treatment temperature. The tensile test result shows that the ultimate tensile strength, modulus of elasticity and strain percentage decrease as heat treatment temperature increases. The chemical properties of Ni3Al alloy were determined by using Tafel Extrapolation method and it is proved that this material is excellent against corrosion. It can be conclude that Ni3Al alloy enfolds most of the basic quality for a material to be suggested as alternative material for wheel hub in airless tyre application.

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