Volume 6, Issue 2 (Journal OF Welding Science and Technology 2020)
JWSTI 2020, 6(2): 145-160 |
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1- Department of Materials Engineering, Malek Ashtar University of Technology, Iran
2- Faculity of Mechanics, Malek Ashtar University of Technology, Iran
3- Faculty of Naval Aviation, Malek Ashtar Univesrsity of Technology, Iran
2- Faculity of Mechanics, Malek Ashtar University of Technology, Iran
3- Faculty of Naval Aviation, Malek Ashtar Univesrsity of Technology, Iran
Abstract: (2474 Views)
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.
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