Comparison Of Hardness Properties Of Oxidised Al-Alloy And TI-Alloy For Duplex Coating Purpose

Saiful A-Fifuddin , Jail (2011) Comparison Of Hardness Properties Of Oxidised Al-Alloy And TI-Alloy For Duplex Coating Purpose. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This research aims to study the properties of oxidized aluminium alloy and titanium alloy for duplex coating purpose. Aluminium alloy (7075) and titanium alloy (Ti6Al4V) are extensively used in aerospace application and aircraft structure because of low density, high strength, light weight and durability at high temperatures. However aluminium alloys (7075) and titanium alloy (Ti6Al4V) has a disadvantage when it’s exposed to elevated temperatures that is an oxidation. Oxide layer is formed on the surface of the metal and growth with temperature behaviour. Respectively oxide layer contain porosity that will increase the corrosion behaviour in metal. Nevertheless, the oxide layer has a higher hardness than pure metal or alloy. To utilize the hardness properties of the oxide layer as well as to prevent the corrosion behaviour duplex coating is an approach to optimize its properties. The combination of oxidizing process with physical vapour deposition coating (duplex coating) can improve the performance of the alloy. Through this research the properties of oxidised aluminium alloy (7075) and titanium alloy (Ti6Al4V) will be studied to determine which metal are more suitable for duplex coating purpose to optimize the usage of this metals alloys in aerospace applications and aircraft structures. In this research, Vickers micro hardness tests, Scanning electron microscopy and X-ray diffraction was used to investigate the hardness properties, thickness of the oxide layer, morphology of the oxide layer microstructure. Found that the oxidation occurred on the titanium alloy is better than aluminium alloy. Titanium alloy at temperature 700oC and 750oC for 5 hours has a significant effect on oxide thickness and hardness properties are formed at different temperatures and times.

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