Investigation Of Fatigue Crack Growth On Heat Treated Aluminum 7075 With The Effect Of Corrosion

Mohammad Khalid, Khambali (2010) Investigation Of Fatigue Crack Growth On Heat Treated Aluminum 7075 With The Effect Of Corrosion. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The objective of this research is to investigate effect the heat treatment on fatigue crack growth of aluminum 7075 in corrosive environment. In this research, the aluminum alloy 7075 is used because it has the highest attainable strength levels of all forged alloys and has a good stress corrosion resistance. However, they are very susceptible to stress corrosion cracking when aged into maximum strength heat treatment. The goal of this research is to be able to better predict fatigue crack growth (FCG) behavior in 7075 Aluminum Alloy. In this study, the aluminum alloy 7075 sample will be heat treated using two methods, the T6 and RRA heat treatment. The samples will then be exposed to exfoliation corrosion. Several non-heat treated samples will also be exposed to exfoliation corrosion to study the difference behavior between heat treated and non-heat treated samples under corrosion behavior. Those samples will be studied in terms of fatigue crack growth, hardness and fractography. Microstructure observation of the samples will also be done. Data obtained in the study will then be compared to non-heat treated samples. It is predicted that RRA heat treatment samples yield the best strength and corrosion resistance sample compared to the others.

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