Improvement Of Strength And Formability Of Aluminum Alloy Sheet By Artificial Aging Treatment (Application For Car Body Panel)

Siti Nurul Haiza, Mahmud (2009) Improvement Of Strength And Formability Of Aluminum Alloy Sheet By Artificial Aging Treatment (Application For Car Body Panel). Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Nowadays, the demands for high fuel-efficiency to reduce energy consumption and weight of vehicles become a challenge in industries especially in automotive industry. The selection of materials used in vehicles is the most important factors that need to be considered. This study is basically to do improvement on formability and hardness of aluminum alloys 6061-T4 as a choice of material for industries to fulfill the demands. The special properties or characteristics of aluminum alloys 6061-T4 such as lightweight and high corrosion resistance have put them among the best chosen materials to be used as automotive body sheets. Heat treatment processes are the best ways to improve its formability and hardness as aluminum alloys 6061-T4 are the heat-treatable wrought aluminum alloys and thus chosen in this project. The processes were performed by re-solution heat treatment, quenching, artificial aging and paint baking. The re-solution heat treatment was performed at 5300C for 2 hours and followed by quenching in water at room temperature to retain or freeze its microstructure in α-phase. While, artificial aging treatment was carried out at 1700C for 8 hours in order to strengthen the material. The formability and strength of aluminum alloy were determined by uniaxial tensile test and three-point bending test respectively. The value of strain-hardening exponent (n-value) and plastic strain ratio (r-value) indicates the formability of aluminum alloy. The flexure stress also was observed to clearly prove the results. The results were compared between sequences of conventional and present processes of car body panel.

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