TY - JOUR JF - JWSTI JO - JWSTI VL - 6 IS - 2 PY - 2020 Y1 - 2020/12/01 TI - Evaluation of fatigue behavior of cast and ultra-fine processed Al-7075 by using friction stir technique TT - ارزیابی رفتار خستگی آلیاژ ریختگی و فرآوری شده فوق ریزدانه آلیاژ Al-7075 با استفاده از فناوری اصطکاکی اغتشاشی N2 - This paper presents experimental results on the fatigue properties of the modified microstructure of cost Al-alloy 7075 via friction stir processing (FSP). The microstructural behavior was investigated by using optical microscope (OM). The grain size of cast FSP-ed at different locations was investigated via XRD. Uniaxial tensile and bending fatigue tests were carried out at room temperature on both cast and after FSP conditions. Fatigue properties were investigated using a fully reversible bending testing machine. Significance enhancement of mechanical properties was attributes to the elimination of porosities as well as uniform distribution of ultra-fine grains throughout the matrix. A fractographic study was done to understand the fracture behavior being changed from quasi-cleavage fracture to dimple fracture. The resultant ultra-fine grain structure causes significant increasing in tensile and fatigue properties. SP - 145 EP - 160 AU - Soltanipour, A.R. AU - Soltanipour, A.R. AU - Farmanesh, K. AD - Department of Materials Engineering, Malek Ashtar University of Technology, Iran UR - http://jwsti.iut.ac.ir/article-1-337-en.html ER -