Evaluation of fatigue behavior of cast and ultra-fine processed Al-7075 by using friction stir technique

Soltanipour, A.R.; Soltanipour, A.R.; Farmanesh, K.

Volume 6, Issue 2 (Journal OF Welding Science and Technology 2020) JWSTI 2020, 6(2): 145-160 | Back to browse issues page

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Soltanipour A, Soltanipour A, Farmanesh K. Evaluation of fatigue behavior of cast and ultra-fine processed Al-7075 by using friction stir technique. JWSTI 2020; 6 (2) :145-160
URL: http://jwsti.iut.ac.ir/article-1-337-en.html

Evaluation of fatigue behavior of cast and ultra-fine processed Al-7075 by using friction stir technique

A.R. Soltanipour ^*

¹, A.R. Soltanipour²

, K. Farmanesh³

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

Abstract: (2470 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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