Effect of Processing Parameters on Superplastic and Corrosion Behavior of Aluminum Alloy Friction Stir Processed

2012 ◽  
Vol 706-709 ◽  
pp. 965-970 ◽  
Author(s):  
A. Burgueño ◽  
T. Dieguez ◽  
H. Svoboda
Keyword(s):  
Grain Size ◽  
Corrosion Resistance ◽  
Strain Rate ◽  
Friction Stir Processing ◽  
Superplastic Forming ◽  
Traverse Speed ◽  
Processing Parameters ◽  
Localized Corrosion ◽  
Friction Stir ◽  
Major Development

Friction Stir Processing (FSP) is a variant of Friction Stir Welding, and can be used to modify the materials microstructure to functionalize it. Superplastic forming is a technological process used to produce components with very complex shapes. In the last two decades it has been a topic of major development. In Fine Structure Superplasticity (FSSP), the initial grain size exerts a strong influence on the superplastic strain rate and temperatures. Refining grain size (GS) the parameters (temperature and strain rate) of superplastic forming could be optimized. Thermal stability is also an important factor to obtain superplasticity. FSP is used to refine GS, but the optimum processing parameters are still under study over different materials. Corrosion resistance can be affected by FSP too, but the information about it is scarce. In the present study, 7075-T651 aluminium alloy was friction stir processed under different conditions in order to improve superplastic behavior. Tool profile, rotation rate and traverse speed were analyzed. Microstructures with <4 μm grain size were obtained. The maximum superplastic elongations, in a range of 740 to 900%, at 400°C were obtained at 1x10-2s-1strain rate. The results were discussed in terms of constitutive equations and microstructure evolution. Localized corrosion potentials were obtained. Localized corrosion resistance was affected by friction stir processing.

Effect of Processing Parameters on Thermo-Mechanically Affected Zone of Friction Stir Processed AZ91 Magnesium Alloy

2010 ◽  
Author(s):  
M. Taherishargh ◽  
N. Parvin ◽  
P. Asadi
Keyword(s):  
Grain Size ◽  
Magnesium Alloy ◽  
Friction Stir Processing ◽  
Rotational Speed ◽  
Traverse Speed ◽  
Processing Parameters ◽  
The Other ◽  
Az91 Magnesium Alloy ◽  
Friction Stir ◽  
Az91 Magnesium

AZ91 Magnesium alloy was subjected to friction stir processing (FSP). The microstructural analyses of the friction stir processed (FSPed) specimens were carried out and the effects of pass number, rotational speed, and traverse speed upon thermo-mechanically affected zone (TMAZ) were investigated. The TMAZ is consisted of a region with highly elongated grains and a partially recrystalized zone. Decreasing the rotational speed and increasing the traverse speed increased the thickness of recrystallized zone; while, the thickness of the other zone decreased. On the other hand, it lessened the gradient of the grain size from the stir zone (SZ) to the base metal. Applying several FSP passes, lead to more homogeneous TMAZ structure with the finer grain size.

scholarly journals Friction Stir Processing of the Magnesium Alloy AZ61: Grain Size Refinement and Mechanical Properties

2012 ◽  
Vol 706-709 ◽  
pp. 1823-1828 ◽  
Author(s):  
J.A. del Valle ◽  
P. Rey ◽  
D. Gesto ◽  
D. Verdera ◽  
Oscar A. Ruano
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Magnesium Alloy ◽  
Friction Stir Processing ◽  
Superplastic Forming ◽  
Important Change ◽  
Heat Extraction ◽  
Processing Temperature ◽  
Friction Stir ◽  
Size Refinement

The effect of friction stir processing (FSP), on the microstructure and mechanical properties of a magnesium alloy AZ61 has been analyzed. This is a widely used wrought magnesium alloy provided in the form of rolled and annealed sheets with a grain size of 45 μm. The FSP was performed with an adequate cooling device in order to increase the heat extraction and reduce the processing temperature. The final microstructure showed a noticeable grain size refinement down to values close to 1.8 μm and an important change in texture. The change in texture favors basal slip during tensile testing leading to an increase of ductility and a decrease in yield stress. The stability of the grain size and the creep behavior at high temperatures were investigated. The optimum conditions for superplastic forming were determined; however, the presence of a large amount of cavities precludes the achievement of high superplastic elongations. Additionally, these results are compared with those obtained by severe hot rolling.

Influence of Friction Stir Processing Parameters on the Fabrication of SiC/316L Surface Composite

2010 ◽  
Vol 297-301 ◽  
pp. 221-226 ◽  
Author(s):  
R. Salekrostam ◽  
M.K. Besharati Givi ◽  
P. Asadi ◽  
P. Bahemmat
Keyword(s):  
Stainless Steel ◽  
Friction Stir Processing ◽  
Traverse Speed ◽  
Processing Parameters ◽  
Fusion Welding ◽  
Welding Parameters ◽  
Stainless Steel 316L ◽  
Friction Stir ◽  
The Many ◽  
Welding Processes

Compared to the many fusion welding processes that are routinely used for joining stainless steel 316L, the friction stir welding (FSW) process is an emerging solid state joining process in which the material that is being welded does not melt and is being recast. The welding parameters play a major role in deciding the weld quality. In this investigation an attempt has been made to understand the influences of rotational speed and traverse speed of the tool on the microstructure of the friction stir processing zone in stainless steel 316L. Five different tool rotational speeds have been used to fabricate the joints at four different traverse speeds from this investigation which is the optimum for the tool speed and higher or lower amounts of these parameters are not useful for the process.

scholarly journals Effect of friction stir processing parameters on the microstructure and properties of ZK60 magnesium alloy

2021 ◽  
Author(s):  
Yijie Hu ◽  
Youping Sun ◽  
Jiangmei He ◽  
Dejun Fang ◽  
Jiaxin Zhu ◽  
...  
Keyword(s):  
Grain Size ◽  
Magnesium Alloy ◽  
Grain Boundaries ◽  
Friction Stir Processing ◽  
Processing Speed ◽  
Rotation Speed ◽  
Processing Parameters ◽  
High Angle ◽  
Friction Stir ◽  
Zk60 Magnesium Alloy

Abstract Friction stir processing is an important method for acquiring ultrafine-grained materials. In this paper, 3mm ZK60 magnesium alloy sheet was carried for friction stir processing. The best processing parameters with a small grain size and maximum mechanical properties were obtained by comparing different rotation speeds and processing speeds. Fine recrystallized grains and high-angle grain boundaries were observed in stirring zone under different processing parameters. With increasing rotation speed, the grain size and high-angle grain boundary ratio increase; while with increasing processing speed, the grain size decrease, and the ratio of high-angle grain boundaries increase. When rotation speed and processing speed are 1400 r·min-1 and 100 mm·min-1, the processing plate have the largest ultimate tensile strength are 267.52 Mpa, that reached 84.62% of the base metals, and the yield strength, elongation and grain size are 166.97 Mpa, 15.32 % and 1.12 ± 1.64 µm, respectively. The processing plate has more excellent damping performance than rolled.

scholarly journals Effects of the Processing Parameters of Friction Stir Processing on the Microstructure, Hardness and Tribological Properties of SnSbCu Bearing Alloy

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5826
Author(s):  
Beata Leszczyńska-Madej ◽  
Marcin Madej ◽  
Joanna Hrabia-Wiśnios ◽  
Aleksandra Węglowska
Keyword(s):  
Tribological Properties ◽  
Friction Stir Processing ◽  
Traverse Speed ◽  
Processing Parameters ◽  
Friction Stir ◽  
Modification Process ◽  
Hardness Tests ◽  
Before And After ◽  
Bearing Alloy ◽  
The Impact

In the study, the friction stir processing (FSP) method was used to modify the surface layer of a tin-based bearing alloy. The modification was aimed at extending the service life of bearings by improving their tribological properties. The results of investigations of the microstructure, hardness and tribological properties of the SnSbCu bearing alloy after FSP using various rotational speeds of the tool—280, 355, 450 and 560 RPM—and the constant traverse speed of 355 mm/min are presented. Particular attention was paid to the possibility of changing the morphology of the precipitates present in the alloy, and to the impact of this parameter on improvement of the tribological properties. The research carried out in this paper covered investigations of the microstructure using light and scanning electron microscopy (SEM) along with analysis of the chemical composition in micro-areas and Brinell hardness tests. Additionally, the sizes of the SnSb and CuSn precipitates present in the microstructure before and after the modification process were determined, as were the tribological properties under technically dry friction conditions and lubrication with TU 32 oil. It was proven that using friction stir processing favors refinement of the microstructure and improves the tribological properties of the analyzed alloy.

Microstructural Refinement of Pure Copper by Friction Stir Processing

2013 ◽  
Vol 787 ◽  
pp. 256-261 ◽  
Author(s):  
Salar Salahi ◽  
Vahid Rezazadeh ◽  
Ali Sharbatzadeh ◽  
Atabak Iranizad ◽  
Hamed Bouzary
Keyword(s):  
Grain Size ◽  
Friction Stir Processing ◽  
Rotational Speed ◽  
Frictional Heating ◽  
Pure Copper ◽  
Traverse Speed ◽  
Work Piece ◽  
Process Conditions ◽  
Nugget Zone ◽  
Friction Stir

Recently friction stir processing (FSP) was developed as a generic implement for microstructural modification based on the principles of FSW using a rotating tool inserted in a monolithic work piece which provides frictional heating and mechanical mixing. In this paper, the microstructural evolution characteristics of nugget zone were investigated during friction stir processing (FSP) of pure copper. Pure copper plates were friction stir processed to the depth of 3.4 mm at different process conditions by varying the traverse speed from 30 to 120 mm/min at rotation speeds of 400 and 600 rpm..Defects were observed in rotational speed of 400 rpm. Grain size of NZ depended significantly on plastic deformation and heat input value. By increasing traverse speed at constant rotational speed of 600 rpm grain size of the nugget zone decreased and the hardness increased. Ultimate tensile strength increased with decrease in grain size. FSP was found as an effective method to develop fine-grained microstructure in copper plates.

scholarly journals High Strain Rate Superplasticity of WE54 Mg Alloy after Severe Friction Stir Processing

Metals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1573
Author(s):  
Marta Álvarez-Leal ◽  
Fernando Carreño ◽  
Alberto Orozco-Caballero ◽  
Pilar Rey ◽  
Oscar A. Ruano
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Friction Stir Processing ◽  
High Strain ◽  
Flow Behavior ◽  
Traverse Speed ◽  
Grain Boundary Sliding ◽  
Coarse Grained ◽  
Friction Stir ◽  
Ultrafine Grained

Friction stir processing (FSP) was used on coarse-grained WE54 magnesium alloy plates of as-received material. These were subjected to FSP under two different cooling conditions, refrigerated and non-refrigerated, and different severe processing conditions characterized by low rotation rate and high traverse speed. After FSP, ultrafine equiaxed grains and refinement of the coarse precipitates were observed. The processed materials exhibited high resistance at room temperature and excellent superplasticity at the high strain rate of 10−2 s−1 and temperatures between 300 and 400 °C. Maximum tensile superplastic elongation of 726% was achieved at 400 °C. Beyond 400 °C, a noticeable loss of superplastic response occurred due to a loss of thermal stability of the grain size. Grain boundary sliding is the operative deformation mechanism that can explain the high-temperature flow behavior of the ultrafine grained FSP-WE54 alloy, showing increasing superplasticity with increasing processing severity.

The Effect of Process Parameters on the Friction Stir Processed AS7U3G Aluminium Alloy

2014 ◽  
Vol 592-594 ◽  
pp. 776-780
Author(s):  
L. John Baruch ◽  
R. Raju ◽  
V. Balasubramanian ◽  
I. Dinaharan
Keyword(s):  
Corrosion Resistance ◽  
Rotational Speed ◽  
Material Flow ◽  
Flow Behavior ◽  
Traverse Speed ◽  
Processing Parameters ◽  
Tool Rotational Speed ◽  
Flow Process ◽  
Friction Stir ◽  
State Process

Friction stir processing (FSP) is a solid-state process leading to very significant microstructural modifications. Despite the large number of studies, most of the work that has been done in the FSP field focuses on microstructural evolution, tensile properties, hardness, fatigue strength, corrosion resistance etc. However there is not much information available on correlation of FSP parameters with evolution of defect free processed zone. In order to produce a defect free processed zone, selecting the best processing parameters is very important. In this investigation, the effect of two main FSP parameters (such as tool rotational speed which was kept constant and tool transverse speed which was varied) on the formation/ evolution of defect free processed zone was studied. It is found that at a tool rotational speed 600 rpm and a traverse speed of 12 mm/min the processed zone is defect free. Numerous investigations have been conducted to understand material flow behavior during FSW/FSP. However, the flow process of material during FSW/FSP is still not well-understood, and different explanations have been proposed. In this investigation an attempt has been made to understand the flow of material during FSP and it is reported.

Investigation of the effect of friction stir processing parameters on temperature and forces of Al–Si aluminum alloys

2015 ◽  
Vol 232 (3) ◽  
pp. 213-229 ◽  
Author(s):  
Mostafa Akbari ◽  
Abolfazl Khalkhali ◽  
Seyyed Mohammad Ebrahim Keshavarz ◽  
Ehsan Sarikhani
Keyword(s):  
Temperature Distribution ◽  
Friction Stir Processing ◽  
Rotational Speed ◽  
Critical Role ◽  
Traverse Speed ◽  
Processing Parameters ◽  
Measuring System ◽  
Temperature History ◽  
Friction Stir ◽  
History Of

Temperature and forces in friction stir processing (FSP) induced by process input parameters play a critical role in successful welding. In this investigation, the effect of the process parameters on the axial and longitudinal forces and temperature history of the process were investigated. The temperature distribution during the FSP was determined by placing thermocouples in the workpiece and measuring the temperature during the process. The tool forces were investigated experimentally using an especially designed load measuring system. The pin shape, rotational speed and traverse speed were the parameters taken into consideration. It was observed that increase in tool traverse speed or decrease in rotational speed leads to increase in both tool axial and longitudinal forces.

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