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    The Investigation of the Effects of T6 and High Temperature Pre-precipitation HTPP Heat Treatments on Hot Tensile Properties of AA7075 Aluminium Alloys
    (Kırıkkale Üniversitesi, 2020) Sunar, Talha; Özyürek, Dursun
    Mechanical properties at elevated temperatures for AA7075 aluminium alloy processed with two different heat treatment as T6 and HTPP, were investigated in this study. The alteration in strength and hardness which can be occur as a result of heat treatment was aimed to research. For this purpose, tensile tests were carried out at the temperatures of 100, 200, 300?C. The microstructures of the samples which tensile tests were applied, examined by optical microscope and scanning electron microscope SEM. As results for the studies made, it was observed that T6 samples showed better strength properties but HTPP samples has better ductility properties with respect to T6 samples. For the hardness results, higher hardness values were obtained from T6 samples. Fracture surfaces examinations showed that the fracture was semi-ductile for the temperatures below 200?C and ductile for the temperatures of 200 and 300?C. It is determined that the ductility was increased with the rise in the temperature.