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Friction stir processing
About: Friction stir processing is a research topic. Over the lifetime, 2977 publications have been published within this topic receiving 62158 citations.
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TL;DR: In this article, the effects of FSP on the microstructure and mechanical properties of an investment cast Al-7Si-Mg alloy were assessed, showing that FSP eliminates porosity and significantly refines eutectic Si particles.
Abstract: Friction stir processing (FSP) is emerging as a promising tool for microstructural modification. The current study assesses the effects of FSP on the microstructure and mechanical properties of an investment cast Al-7Si-Mg alloy. FSP eliminates porosity and significantly refines eutectic Si particles. The extent of particle refinement varied with changes in processing conditions. A high tool rotation rate and a low-to-intermediate tool traverse speed generated a higher volume fraction of finer particles. Tensile ductility changed significantly as a result of FSP, whereas ultimate tensile strength improved only marginally. Yield strength was similar in both cast and FSP samples under various heat-treated conditions, with the highest value obtained after a T6 heat treatment. Furthermore, FSP caused significant grain refinement in the stir zone, subsequently transforming into very coarse grains as abnormal grain growth occurred during solution treatment at high temperature.
43 citations
01 Jan 2018
TL;DR: In this paper, the authors focus on the improvement of micro structural and mechanical properties of the gas tungsten arc welded AA 2024 alloys using a novel approach of friction stir processing procedures.
Abstract: Gas tungsten arc welding is the most commonly used process for joining of AA 2024 alloys, which are highly demanded in aircraft structural applications. The quality of the welds and strength of the welded joints achieved using this process, the weld fusion zone of this alloys usually exhibit the columnar grains, which are coarser than the substrate, due to the persisting thermal conditions when the fusion zone starts to solidify. This kind thermal attribution often causes to degrade the strength of the weld metal and lead to impair its resistance to sustain the hot cracking issues. In addition, there are some unavoidable micro structural defects formations such as porosity and micro cracks in the fusion zone. The formation of these defects at the top of the fusion zone will result in the reduction of weld strength about to half of the base metal strength. The present study will focus on the improvement of micro structural and mechanical properties of the gas tungsten arc welded 2024 aluminium alloys using a novel approach of friction stir processing procedures. In order to overcome these issues, the top surfaces of the gas tungsten arc welds are processed using friction stir processing up to certain depth from the top of the welds. The weld metal micro structural characterization studies revealed that the friction stir processing was controlled or decreased the amount of porosities and micro cracks formation. In addition, it destroyed the coarse grains dendritic structure in the weld zone and helped to dissolves the precipitates of secondary particles, which exists along the grain boundaries. The changes in the weld microstructures and grain refinement significantly improved the hardness of the friction stir processed welds over the base metal and gas tungsten arc welds. The mechanical properties also significantly changed along with the quality of the weldments. In addition, the formation of very fine precipitates is observed in stir zone due to the effect of intense plastic deformation and temperatures during friction stir processing.
43 citations
TL;DR: In this paper, the influence of three factors, such as volume percentage of reinforcement particles (i.e., Al 2 O 3 ), tool tilt angle and concave angle of shoulder, on the mechanical properties of surface composites fabricated via friction stir processing was studied.
43 citations
TL;DR: In this paper, an attempt has been made to explore the possibility of improving the corrosion resistance of AA5083 by FSP, which resulted in refinement of the grain structure, dispersion and partial dissolution of secondary phase particles in the matrix.
Abstract: Aluminium alloy 5083, widely used in marine applications, undergoes accelerated corrosion in sea water due to the aggressive reaction of chloride ions with the secondary phase particles and other intermetallics present in the alloy matrix. The corrosion rate of the alloy is also influenced by the temperature difference between the alloy and its environment. Friction stir processing (FSP) is a recent solid state processing technique for improving the surface properties of metals and alloys. In this study, an attempt has been made to explore the possibility of improving the corrosion resistance of AA5083 by FSP. FSP trials were performed by varying the tool rotation speed, tool traverse speed and shoulder diameter of the tool, as per face centered central composite design. The corrosion potential and the corrosion rate of friction stir processed AA5083 was studied using potentiodynamic polarization studies, at three different temperatures. Mathematical models based on polynomial—radial basis function were developed and used to study the effect of process parameters on the corrosion potential and the corrosion rate of friction stir processed AA5083. FSP resulted in refinement of the grain structure, dispersion and partial dissolution of secondary phase particles in the matrix, which increased the corrosion resistance of the alloy.
43 citations
TL;DR: In this article, a multi-pass FSP has been employed to disperse the nanoscale particles of a polymer-derived silicon carbonitride (SiCN) ceramic phase into copper by an in-situ process, and the results indicate a uniform distribution of similar to 100 nm size particles of the ceramic phase in the copper matrix after ESP.
43 citations