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Rotating bending fatigue is considered to be an important characteristic of the mechanical parts. Herein, the high temperature fatigue behavior of 7075 aluminum is studied in terms of different mechanical and heat treatment procedures. These experiments were carried out in order to gain additional knowledge regarding the relationship between these processes and thefatigue behavior of the present alloy. A rotating bending test machine has been used to reach these goals. The fatigue experiments were performed under two different testing temperatures, 250 and 300 "C, along with the room temperature experiments. Low plasticity burnishing technique was applied on part of the specimens as a mechanical means for enhancing the fatigue strength of the present alloy. The results of the present work show that burnishing processes has played a considered role in increasing the fatigue strength of the present alloy. The enhanced fatigue resistance of the burnished specimens at high and room temperature was largely due to overall increase in the strength of the surface layer and delayed fatigue crack initiation on the surface.

HIGH TEMPERATURE FATIGUE BEHAVIOR OF 7075A1 VIA LOW PLASTICITY BURNISHING