Investigation on the Corrosion Effect of Friction Stir Welded AA2024 T3 Aluminum Alloy Joints

2012 ◽  
Vol 525-526 ◽  
pp. 129-132 ◽  
Author(s):  
Yu E Ma ◽  
Zhen Qiang Zhao
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Aluminum Alloy ◽  
Welded Joint ◽  
Weld Zone ◽  
Base Material ◽  
Localized Corrosion ◽  
Aircraft Structure ◽  
Friction Stir ◽  
Scanning Electron

Before friction stir welded integral panels are used in main aircraft structure, the corrosion behavior of welded joint need to be studied in detail. 2024 T3 samples were designed and welded by friction stir welding; the microstructure crossing the weld zone was observed by scanning electron microscopy (SEM), the feature of different zones (base material, thermo-mechanical affected zone, nugget) was seen; the corrosion testing in NaCl smoking box was carried out, and microstructure was observed after corrosion, localized corrosion predominantly occurs in the thermo-mechanical affected zone.

Study on the Mechanical Behavior of Aluminum Alloy 5083 Friction Stir Welded Joint

2014 ◽  
Author(s):  
A-H. I. Mourad ◽  
M. Allam ◽  
A. El Domiaty
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Aluminum Alloy ◽  
Mechanical Behavior ◽  
Optical Microscopy ◽  
Welded Joint ◽  
Friction Stir ◽  
Aluminum Alloy 5083 ◽  
Tool Pin ◽  
Scanning Electron

The mechanical behavior of friction stir welded joints made of aluminum alloy 5083-H111 was studied in this investigation. Different welding processes parameters (rotational speeds, travelling speeds and tool pin shapes) were used to investigate the effect of process parameters on the strength and fracture properties of the joint. Scanning electron microscopy and optical microscopy analysis were conducted to study the effect of friction stir welding FSW process on the grain size in the welding zones. In general, the results illustrated that tool profile, the rotation speed and the traveling speed has great effect on the strength of the welded joint. Scanning electron microscopy and optical microscopy investigations showed that the grains inside the welding zone was refined and equiaxed resulting in higher hardness inside the nugget.

scholarly journals Characterization of Brass/Steel Plates Joined by Friction Stir Welding

2018 ◽  
Vol 7 (3.34) ◽  
pp. 366
Author(s):  
Mariyappan. K ◽  
Praveen K ◽  
Suresh Kumar.S ◽  
Kadambanathan. K ◽  
Rajamanickam. S ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Tensile Strength ◽  
Friction Stir Welding ◽  
Weld Zone ◽  
Steel Plates ◽  
Micro Hardness ◽  
Friction Stir ◽  
Fsw Parameters ◽  
Scanning Electron

The aim of this study is to show the feasibility for butt joining dissimilar brass to austenitic stainless steel plates by Friction Stir Welding. In this study, the limited FSW parameters were employed. Metallurgical characterization like Scanning Electron Microscopy and Mechanical characterization like tensile test, Micro hardness is done to investigate the joint performance and the weld zone of dissimilar brass/steel joints. The tensile strength and micro hardness values are 20 MPa, 122 MPa and 157 MPa and 175 Hv, 196 Hv and 199 Hv for the table traverse speeds of 40 mm/min, 50 mm/min and 60 mm/min respectively. The tensile strength of dissimilar brass/steel joint was found to be lower than that of parent metals. The defect free brass/steel interfaces were seen by Scanning Electron Microscopy. It was illustrated that the stirred zone exposed to two main structures namely, recrystallized grains of brass and intercalated swirl and vortex-like structure which can be characterized both the recrystallized brass grains and steel layers. This work is one of the preliminary studies on the detailed examinations of the dissimilar brass/steel joined by Friction stir welding. 

scholarly journals Surface Hybrid Nanocomposite Produced by Friction Stir Processing: Microstructural Evolution, Mechanical Properties and Tribological Behavior

2021 ◽  
Author(s):  
Saeed Ahmadifard ◽  
Nasir Shahin ◽  
Mojtaba Vakili-azghandi ◽  
Shahab Kazemi
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Friction Stir Processing ◽  
Travel Speed ◽  
Hybrid Nanocomposites ◽  
Max Phase ◽  
Hybrid Nanocomposite ◽  
Friction Stir ◽  
Scanning Electron

Abstract This study investigates the effects of incorporating Ti3AlC2 MAX phase into Al7075-T6 alloy by friction stir processing as well as adding Al2O3 nanoparticles to obtain a surface hybrid nanocomposite. These composites were successfully prepared by friction stir processing with a rotational speed of 1000 rpm and a travel speed of 28 mm/min after 3 passes. Optical, atomic force and scanning electron microscopy as well as microhardness, tensile and wear tests utilized to characterize the fabricated surface hybrid nanocomposites. Results showed that the maximum tensile strength and hardness value were achieved for Al-100% Al2O3 composite due to more grain refinement and effective dispersion of nanoparticles. Due to its laminar structure, Ti3AlC2 MAX phase enhanced better tribological characterization whereas Al2O3 nanoparticles cause better mechanical properties. Scanning electron microscopy tests revealed that the wear mechanism changes from adhesive for Al7075 alloy to adhesive-abrasive for the nanocomposite specimens.

Characterization of Friction Stir Welding on Aluminum

2009 ◽  
Vol 68 ◽  
pp. 167-174 ◽  
Author(s):  
Jerry Wong ◽  
Patricia del C. Zambrano ◽  
Martha Patrizia Guerrero-Mata ◽  
Victor Mucino ◽  
Rafael Colás
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Carrying Capacity ◽  
Feeding Rate ◽  
Load Carrying Capacity ◽  
Rotating Speed ◽  
Friction Stir ◽  
Load Carrying ◽  
Scanning Electron

A series of linear and spot stir welding friction tests were carried out on aluminum samples of 1 mm in thickness and area of 100 mm x 27 mm. The tool rotating speed was varied from 2000 to 4000 RPM and the feeding rate from 45 to 67.8 mm/min. The temperature distribution during welding was measured by thermocouples inserted within the aluminum strips. The microstructure of the welded nuggets and the HAZ were analyzed by optical and scanning electron microscopy. Some samples were tested intension to measure the load carrying capacity of the welded bead. Preliminary analyses indicate that the temperature at the heat affected zone increases with the rotating speed.

Effects of Homogenization-Free on the Microstructures of an Al-Mg-Si-Cu Hot-Rolled Plate for Automotive Pannel

2018 ◽  
Vol 941 ◽  
pp. 1529-1534
Author(s):  
Ni Tian ◽  
Qi Long Liu ◽  
Zi Yan Zhao ◽  
Gang Zhao ◽  
Kun Liu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Aluminum Alloy ◽  
Rolling Direction ◽  
Rolled Plate ◽  
Alloy Plate ◽  
Solution Treated ◽  
Aluminum Alloy Plate ◽  
Hot Rolled ◽  
Scanning Electron

The microstructure of Al-1.01Mg-1.11Si-0.38Cu-0.69Mn aluminum alloy plate hot-rolled from homogenization and homogenization-free ingots were investigated by optical microscopy and scanning electron microscopy assisted with energy dispersive spectroscopy (SEM/EDS). The results showed that there are 3 main kinds of constituents such as Mg2Si, AlCuMgSi and AlFeMnSi in the as-cast Al-1.01Mg-1.11Si-0.38Cu-0.69Mn aluminum alloy ingot. After homogenization treated at 545°C for 24h, the black Mg2Si and the white bright AlCuMgSi particles in the ingot dissolved into matrix, but the grey AlFeMnSi phase partly dissolved, contracted into sphere and become coarse, many ultrafine dispersoids appear in the dendritic arms. The constituents in the plates hot-rolled from the homogenization and homogenization-free ingots are both distributed as broken chains along the rolling direction. However, compared with the particles configuration in the plate that hot-rolled from homogenization ingot, the particles in the plate that hot-rolled from the homogenization-free ingot are finer, more numerous and more homogenous, and with insufficient recrystallization when the plates are solution treated at 545°C for 2 h and then water quenched.

Process Study on Prepared Al2O3-TiB2 Composite Coating by Reactive Spray

2012 ◽  
Vol 472-475 ◽  
pp. 309-312
Author(s):  
Xiao Ping Zhou ◽  
Ming Li ◽  
Xin Zhou
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Aluminum Alloy ◽  
Composite Coating ◽  
Milled Powder ◽  
X Ray ◽  
Phase Constituent ◽  
Process Study ◽  
High Microhardness ◽  
Scanning Electron

The microstructures and properties of Al2O3-TiB2 composite coating on the surface of the aluminum alloy by reactive spraying was studied. The influences of mechanical alloying and spraying temperature on the phase constituent and microstructure of the composite were analyzed by X-ray diffractometry(XRD) and scanning electron microscopy(SEM). The results indicate that Al2O3-TiB2 composite coating is obtained by plasma spraying using milled powder of Al，TiO2，B2O and B2O3. The coating possesses high microhardness of 1300 HV0.1.

scholarly journals Double Reinforcement of Al–Fe Intermetallic Composites Fabricated by Friction Stir Processing

Metals ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1002
Author(s):  
Chunping Huang ◽  
Yang Xia ◽  
Chun Xia ◽  
Fencheng Liu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Friction Stir Processing ◽  
Volume Fraction ◽  
X Ray Diffraction ◽  
X Ray ◽  
Friction Stir ◽  
Metallurgical Bond ◽  
Aluminum Alloy Surface ◽  
Scanning Electron

A double reinforced layer on an aluminum alloy surface was produced using friction stir processing (FSP) by adding 34CrNiMo6 powder into Al (AA2024) substrate for better wear resistance and gradient transitions. The microstructures of the composites were analyzed using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The phase composition was examined by X-ray diffraction (XRD). The results show that the double reinforced layer of the Al13Fe4 intermetallic compound could be successfully fabricated via FSP. The volume fraction of Al13Fe4 in the double reinforced layer was higher than in the single reinforced layer due to adding 34CrNiMo6 powder and reinforced twice, and the Al13Fe4 particles were dispersed more homogeneously in the double reinforced layer. The interfaces between the double and single reinforced layer had a good metallurgical bond. The microhardness of the double reinforcement layer was significantly increased. Compared with the AA2024 substrate, the microhardness of the double and single reinforced layers increased five- (576 HV) and two-fold (254 HV), respectively.

Effect of Pre-Rolling Reduction on Intergranular Corrosion of Aluminum Alloy 2519A

2007 ◽  
Vol 546-549 ◽  
pp. 1117-1122 ◽  
Author(s):  
Y. Liu ◽  
Xin Ming Zhang ◽  
B. Liu ◽  
Hui Zhong Li ◽  
Hui Gao
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Aluminum Alloy ◽  
Grain Boundaries ◽  
Intergranular Corrosion ◽  
Discrete Distribution ◽  
Rolling Reduction ◽  
Transmission Electron ◽  
Hardness Tests ◽  
Scanning Electron

The effect of pre-rolling reduction prior to ageing on the size and distribution of the precipitates, the width of precipitation free zones (PFZ) along grain boundaries and intergranular corrosion (IGC) of aluminum alloy 2519A were investigated by hardness tests, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The experimental results showed that the time for peak-age shortened when the reduction increased, which resulted in refining the precipitatates and distributing homogeneously within the grains and hence the IGC decreased. With increasing pre-rolling reduction, the PFZ along grain boundaries became narrower and precipitates changed from continuous chains to discrete distribution, which resulted in high IGC resistance.

Effects of graphene on the microstructure and properties of MAO coatings formed on AA7050

2020 ◽  
Vol 111 (6) ◽  
pp. 463-468
Author(s):  
Bo Xu ◽  
Yafeng He ◽  
Xiangzhi Wang ◽  
Weimin Gan
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Composite Coatings ◽  
Ceramic Coatings ◽  
X Ray Diffraction ◽  
X Ray ◽  
Micro Arc Oxidation ◽  
Scanning Electron

Abstract Ceramic coatings were prepared on the surface of 7050 highstrength aluminum alloy using micro-arc oxidation in an aluminate electrolyte with added graphene. To analyze the surface morphology, roughness, phase composition, and corrosion resistance, scanning electron microscopy, X-ray diffraction, X-ray photoelectron, and electrochemical measurements were used, respectively. The addition of 9 g · L-1 of graphene to the electrolyte decreased the micro-pore size of the composite coatings and improved the density. In addition, with the addition of graphene, the roughness was the lowest, and the corrosion resistance was significantly improved.

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