Abstract
Friction stir processing is an environment friendly surface engineering process that enhances mechanical properties and refines microstructure of processed zones. The aim of this paper is to study the influence of process parameters during friction stir processing of aluminium alloy A2017 plates on surface quality of the processed zones.
Highlights
Friction stir, originally designed as a welding method, recently became used as a surface engineering method that allows obtaining in-situ ultrafine grains in surface layers
Since all the available studies on Friction stir processing (FSP) are focused on microscopic changes, mechanical and tribological properties enhancement induced by FSP, the purpose of this paper is to extend research of FSP and study the effect of process parameters on surface roughness
The visual inspection of the samples after the tests revealed that for aluminium alloy A2017 the surface quality was highly dependent on the process parameters
Summary
Originally designed as a welding method, recently became used as a surface engineering method that allows obtaining in-situ ultrafine grains in surface layers. The similarity of friction stir process kinematics with milling process kinematics makes possible the use of conventional milling machines equipped with force control devices This is one of major advantages of friction stir processing, because it allows finishing the surface and, in the meantime, it applies in-situ localized heat treatment leading to microstructural refinement, densification, homogeneity, increased microhardness, superior wear and corrosion resistance of the surface layer. Karthikeyan et al [12,13,14] studied the friction stir behavior of the aluminum alloys A2285, A413 and A319 in order to examine effect of feed rate and rotational speed on microstructure and properties They reported increased tensile, yield strengths and ductility along with grain size reduction due to FSP. After studying the effect of friction stir processing conditions on A356-T6 cast aluminum alloy, Tajiri et al concluded that lower rotational speed led to better results enhancing fatigue resistance and eliminating casting defects [16]
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