The Effect Of Applied Stress On Heat Treated Aluminum Alloys 7075 In DC Corrosion

Rudy , Majid (2013) The Effect Of Applied Stress On Heat Treated Aluminum Alloys 7075 In DC Corrosion. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

As the second most plentiful metallic element on earth, aluminum has become an economic competitor in engineering applications. The properties of pure aluminum can be improved by addition of other alloying element. Attractive properties of aluminum alloys 7075 made it become a material that used in high strength and corrosion resistance application. The improvement of properties can be achieved by doing heat treatment such as T6, T73, and RRA. The purpose of this project is to investigate the properties of heat treated aluminum alloys 7075 in term of mechanical properties as well as resistance to corrosion. This project has been found the best temperature of retrogression time is 170 oC with 30 minutes which can improve corrosion resistance and as well as maintain the strength of the aluminum alloy 7075. Firstly, all of the samples were heated in T6 temper which is at 470 oC for 1 hour then quench rapidly in ice water before aging at 120oC for 24 hours. This project used various temperature of retrogression which is 170 oC, 190 oC and 210 oC for 10 minutes and 30 minutes every temperature. After that, sample will be aging. Tensile test and Rockwell hardness test have been done to the treated samples to determine tensile strength and hardness. To determine the effect of applied stress in DC corrosion, direct tensile stress along with corrosion test was done. The comparison between corrosion test with and without stress applied is done as well. RRA 173 treated sample provides the higher strength which is 650.9N/mm2 which did not much decline with T6 tempered sample as well as improve the corrosion resistance much better than T6 sample. Precipitation of microstructure has analyzed by using optical microscopy. Comparison between all treated samples has beed prove that, precipitation in microstructure determine the properties of aluminum alloy.

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