Mechanical And Thermal Properties Of Intermetallic NiAl For Automotive Body Applications

Phang, Chee Kong (2010) Mechanical And Thermal Properties Of Intermetallic NiAl For Automotive Body Applications. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This project presents a study on the mechanical and thermal properties of intermetallic NiAl for automotive body applications. The fuel consumption and weight problems have influenced the vehicle development. Hence, a material replacement is an effective method to decrease the automobile lightweighting and fuel consumption. Intermetallic, NiAl is considering one of the materials to replace the automotive body because intermetallic NiAl has good mechanical and thermal properties such as high melting point, low density, excellent oxidation resistance and good thermal stability. Various tests such as hardness test, corrosion test and fatigue test was used to study the properties of intermetallic NiAl material. Besides that, the NiAl material was involved in an annealing heat treatment process. The temperature ranges were 300°C, 500°C and 700°C. This process was to heat the material with the desired temperature after that the composition of NiAl specimens were checked by energy dispersive X-ray spectroscope and X-ray diffraction machine. Furthermore, lattice constant of non-heat treated and heat treated NiAl was calculated by the information obtained from the EDX and XRD graph. The NiAl materials mechanical and thermal properties were compared before and after the heat treatment process. In addition, the experimental results of NiAl were compared with the material of current automotive body. The hardness result of NiAl from the experiments had shown that heat treatment with 700°C had the highest value compared to non-heat treated, 300°C and 500°C which achieved 438.0 HV. Besides that, non-heat treated NiAl had the lowest corrosion potential which was -0.420 V. The corrosion potential was increased due to the increased of heat treated temperature. NiAl had low electrode potential and corrosion current density and this indicate that NiAl was difficult to corrode. On the contrary, intermetallic had major drawback such as brittleness. A further development was studied for the improvement of NiAl.

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