Multimodal Analysis of Spatially Heterogeneous Microstructural Refinement and Softening Mechanisms in Three-Pass Friction Stir Processed Al-4Si Alloy

2021 ◽  
pp. 161351
Author(s):  
Julian Escobar ◽  
Bharat Gwalani ◽  
Matthew Olszta ◽  
Joshua Silverstein ◽  
Nicole Overman ◽  
...  
Keyword(s):  
Microstructural Refinement ◽  
Friction Stir ◽  
Multimodal Analysis

Mechanical and Corrosion Behavior of Friction Stir Welded AA 6063 Alloy

2022 ◽  
pp. 206-214
Author(s):  
Radha R. ◽  
Sreekanth D. ◽  
Tushar Bohra ◽  
Surya Bhan Pratap Singh
Keyword(s):  
Friction Stir Welding ◽  
High Strength ◽  
Metallic Alloys ◽  
Fusion Welding ◽  
Corrosion Properties ◽  
Microstructural Refinement ◽  
Significant Development ◽  
Friction Stir ◽  
Mechanical And Corrosion Properties ◽  
Fsw Parameters

Friction stir welding (FSW) is considered to be the most significant development in solid state metal joining processes. This joining technique is energy efficient, environmentally friendly, and versatile. In particular, it can be used to join high-strength aerospace aluminum alloys and other metallic alloys that are hard to weld by conventional fusion welding. The project aims to join Aluminum 6063 alloy plates by FSW and emphasize the (1) mechanisms responsible for the formation of welds without any defects, microstructural refinement, and (2) effects of FSW parameters on resultant microstructure, mechanical, and corrosion properties.

scholarly journals Characterization of Microstructural Refinement and Hardness Profile Resulting from Friction Stir Processing of 6061-T6 Aluminum Alloy Extrusions

Metals ◽  
2018 ◽  
Vol 8 (7) ◽  
pp. 552 ◽  
Author(s):  
Nelson Netto ◽  
Murat Tiryakioğlu ◽  
Paul Eason
Keyword(s):  
Friction Stir Processing ◽  
Base Material ◽  
Hardness Profile ◽  
Size Distributions ◽  
Coarse Particles ◽  
Microstructural Refinement ◽  
Friction Stir ◽  
The Matrix ◽  
Single Size

In this study, the change in microstructure and microhardness adjacent to the tool during the friction stir processing (FSP) of 6061-T6 extrusions was investigated. Results showed that the as-received extrusions contained Fe-rich constituent particles with two distinct size distributions: coarse particles in bands and finer particles in the matrix. After FSP, Fe-containing particles exhibited single-size distribution and the coarse particles appeared to be completely eliminated through refinement. Microhardness tests showed the presence of four distinct zones and that hardness increased progressively from the dynamically recrystallized closest to the tool, outward through two distinct zones to the base material. The similarities and differences between the results of this study and others in the literature are discussed in detail.

Enhancement of Ductility and Strength through Microstructural Refinement by FSP of Nickel Aluminum Bronze

2006 ◽  
Vol 503-504 ◽  
pp. 161-168 ◽  
Author(s):  
Keiichiro Oh-ishi ◽  
Alexandre P. Zhilyaev ◽  
Terry R. McNelley
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Plastic Deformation ◽  
Physical Metallurgy ◽  
Aluminum Bronze ◽  
Nickel Aluminum ◽  
Microstructural Refinement ◽  
Friction Stir ◽  
Thermomechanical Cycle ◽  
Nickel Aluminum Bronze

Friction stir processing (FSP) is a severe plastic deformation (SPD) method that has been applied to as-cast NiAl bronze (NAB) materials, which are widely used for marine components. The thermomechanical cycle of FSP results in homogenization and refinement, and the selective conversion of microstructures from a cast to a wrought condition. The physical metallurgy of NAB is complex and interpretation of the effects of FSP on microstructure has required detailed analysis by optical and electron microscopy methods. Annealing and isothermal hot rolling have been employed to confirm microstructure-based estimates of stir-zone peak temperatures. The variation of mechanical properties was assessed by use of miniature tensile samples and correlated with microstructure for samples from stir zones of single and multi-pass FSP. Exceptional improvement in strength – ductility combinations may be achieved by FSP of NAB materials.

Microstructural refinement of a cast hypereutectic Al–30Si alloy by friction stir processing

2009 ◽  
Vol 63 (30) ◽  
pp. 2628-2630 ◽  
Author(s):  
A.G. Rao ◽  
B.R.K. Rao ◽  
V.P. Deshmukh ◽  
A.K. Shah ◽  
B.P. Kashyap
Keyword(s):  
Friction Stir Processing ◽  
Microstructural Refinement ◽  
Friction Stir

Improving Erosion Resistance of Hydroturbine Steel Using Friction Stir Processing

2014 ◽  
Vol 136 (4) ◽  
Author(s):  
H. S. Grewal ◽  
H. S. Arora ◽  
H. Singh ◽  
Anupam Agrawal ◽  
S. Mukherjee
Keyword(s):  
Friction Stir Processing ◽  
Electron Backscatter Diffraction ◽  
Optical Microscope ◽  
Impingement Angle ◽  
Slurry Erosion ◽  
Microstructural Refinement ◽  
Friction Stir ◽  
Erosion Rates ◽  
Improved Performance ◽  
Ca6nm Steel

In the present work, the slurry erosion behavior of friction stir processed (FSPed) hydroturbine steel (CA6NM) was investigated. For comparison, the erosion performance of unprocessed CA6NM steel was evaluated under similar conditions. Friction stir processing (FSP) is a microstructural refinement tool which is useful in enhancing the bulk and surface properties of materials. An in-depth characterization of both steels was done using an optical microscope (OM), a scanning electron microscope (SEM) equipped with energy dispersive spectroscopy (EDS), the electron backscatter diffraction (EBSD) technique, and micro- and nano-indentation techniques. The FSP of the steel helped in reducing the erosion rates by 50% to 60%, depending upon the impingement angle. The improved performance of the FSPed steel in comparison to unprocessed steel was attributed to microstructural refinement, which increased the hardness and yield strength. At an oblique impingement angle, plowing, along with microcutting, was observed to be the dominant erosion mechanism. At a normal impingement angle, the material removal process was controlled by the platelet mechanism of erosion. A modified form of the mathematical model for predicting the erosion rates of the ductile materials, proposed by authors earlier, was also presented. This modified model based upon the theory of plasticity was able to predict the erosion rates with an accuracy of ±20%.

Friction Stir Processing: A Technique for Microstructural Refinement in Metallic Materials

2009 ◽  
Vol 618-619 ◽  
pp. 63-67 ◽  
Author(s):  
Sri Lathabai ◽  
R. Migeon ◽  
V.K. Tyagi ◽  
Robert G. O'Donnell ◽  
Yuri Estrin
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Friction Stir Processing ◽  
Frictional Heating ◽  
Metallic Materials ◽  
Microstructural Refinement ◽  
Near Surface ◽  
Friction Stir ◽  
Cu Alloy ◽  
Die Cast

Friction stir processing (FSP) combines frictional heating and severe plastic deformation to produce microstructural modification, either locally targeted at the near-surface regions or through the bulk, of metallic components fabricated by conventional processing routes. In this paper, we highlight the capabilities of this process by applying it to a high-pressure die cast Al-Si-Mg-(Cu) alloy and examining the resulting microstructure and mechanical properties.

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