Effect of second‐phase particle on localized corrosion in Al–Zn–Mg–Cu–Mn alloy friction stir welded joint

2020 ◽  
Author(s):  
Haitao Dai ◽  
Lili Wei ◽  
Hongfeng Huang ◽  
Chongyu Liu ◽  
Zixing Jia ◽  
...  
Keyword(s):  
Welded Joint ◽  
Phase Particle ◽  
Localized Corrosion ◽  
Second Phase ◽  
Friction Stir

scholarly journals Analysis of the Homogeneity of Particle Refinement in Friction Stir Processing Al-Si Alloys

2010 ◽  
Vol 89-91 ◽  
pp. 85-90 ◽  
Author(s):  
Chun Y. Chan ◽  
Philip B. Prangnell ◽  
Simon J. Barnes
Keyword(s):  
Friction Stir Processing ◽  
Process Zone ◽  
Phase Particle ◽  
Processing Parameters ◽  
Second Phase ◽  
Friction Stir ◽  
Die Cast ◽  
Alloy Castings ◽  
Particle Refinement ◽  
Dirichlet Tessellation

Friction Stir Processing (FSP) has potential for locally enhancing the properties of Al-Si alloy castings, for demanding applications within the automotive industry, by greatly refining the second phase particle size. In the present study, the homogeneity of particle refinement and second phase spatial distribution within the process zone, as well as the relationship to the processing parameters, were investigated in a gravity die cast Al-Si LM24/A380 alloy, subjected to a range of FSP conditions. Detailed image analysis and the dirichlet tessellation method were used to quantify particle clustering. ‘Stop-action’ experiments were also used to study the process of particle break up, by following the behaviour through the deformation zone surrounding the tool.

Microstructural Evolution in AA7449 Plate Subject to Friction Stir Welding and Post Weld Heat Treatment

2006 ◽  
Vol 519-521 ◽  
pp. 1181-1186 ◽  
Author(s):  
A. Sullivan ◽  
Nicolas Kamp ◽  
Joseph D. Robson
Keyword(s):  
Heat Treatment ◽  
Friction Stir Welding ◽  
Phase Particle ◽  
Parent Material ◽  
Post Weld Heat Treatment ◽  
Second Phase ◽  
Hardness Profile ◽  
Friction Stir ◽  
The Difference ◽  
Weld Heat

The effect of friction stir welding (FSW) and post weld heat treatment (PWHT) on the second phase particle distribution and cross weld hardness profile in AA7449 plate has been investigated. The alloy was received in an underaged condition, welded, then PWHT to give an overaged condition (in the parent material) . The effect of this complex treatment on the precipitate distribution in the weld and parent plate has been investigated over a range of length scales using small angle X-ray scattering (SAXS), TEM and FEGSEM. It is shown that the PWHT does not improve the hardness in the heat affected zone (HAZ), which is the location of the strength minimum after welding, but it does reduce the difference between the hardness in the HAZ and the nugget and parent hardness. The reduction in nugget strength after PWHT is particularly marked and is due to replacement of fine GP zones formed on post weld natural ageing by coarse overaged precipitates.

The Effect of Second Phase Particle Dissolution on the Corrosion of Friction Stir Spot Welded AZ31B

2018 ◽  
Vol 165 (11) ◽  
pp. C794-C806 ◽  
Author(s):  
Y. Savguira ◽  
T. H. North ◽  
A. P. Gerlich ◽  
S. J. Thorpe
Keyword(s):  
Phase Particle ◽  
Second Phase ◽  
Friction Stir ◽  
Particle Dissolution ◽  
Spot Welded

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.

An appraisal of characteristic mechanical properties and microstructure of friction stir welding for Aluminium 6061 alloy – Silicon Carbide (SiCp) metal matrix composite

2019 ◽  
Vol 13 (4) ◽  
pp. 5804-5817
Author(s):  
Ibrahim Sabry
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Welded Joint ◽  
Rotation Speed ◽  
Fusion Welding ◽  
Friction Stir ◽  
Al 6061

It is expected that the demand for Metal Matrix Composite (MMCs) will increase in these applications in the aerospace and automotive industries sectors, strengthened AMC has different advantages over monolithic aluminium alloy as it has characteristics between matrix metal and reinforcement particles.  However, adequate joining technique, which is important for structural materials, has not been established for (MMCs) yet. Conventional fusion welding is difficult because of the irregular redistribution or reinforcement particles.  Also, the reaction between reinforcement particles and aluminium matrix as weld defects such as porosity in the fusion zone make fusion welding more difficult. The aim of this work was to show friction stir welding (FSW) feasibility for entering Al 6061/5 to Al 6061/18 wt. % SiCp composites has been produced by using stir casting technique. SiCp is added as reinforcement in to Aluminium alloy (Al 6061) for preparing metal matrix composite. This method is less expensive and very effective. Different rotational speeds,1000 and 1800 rpm and traverse speed 10 mm \ min was examined. Specimen composite plates having thick 10 mm were FS welded successfully. A high-speed steel (HSS) cylindrical instrument with conical pin form was used for FSW. The outcome revealed that the ultimate tensile strength of the welded joint (Al 6061/18 wt. %) was 195 MPa at rotation speed 1800 rpm, the outcome revealed that the ultimate tensile strength of the welded joint (Al 6061/18 wt.%) was 165 MPa at rotation speed 1000 rpm, that was very near to the composite matrix as-cast strength. The research of microstructure showed the reason for increased joint strength and microhardness. The microstructural study showed the reason (4 %) for higher joint strength and microhardness.  due to Significant   of SiCp close to the boundary of the dynamically recrystallized and thermo mechanically affected zone (TMAZ) was observed through rotation speed 1800 rpm. The friction stir welded ultimate tensile strength Decreases as the volume fraction increases of SiCp (18 wt.%).

Optimization of friction stir welding parameters of dissimilar aluminium alloys 6061 and 5083 by using response surface methodology

2021 ◽  
pp. 095440622110058
Author(s):  
Sanjeev Verma ◽  
Vinod Kumar
Keyword(s):  
Tensile Strength ◽  
Friction Stir Welding ◽  
Tilt Angle ◽  
Feed Rate ◽  
Aluminium Alloys ◽  
Welded Joint ◽  
Welding Parameters ◽  
Friction Stir ◽  
Industrial Sectors ◽  
Tool Pin

Aluminium and its alloys are lightweight, corrosion-resistant, affordable and high-strength material and find wide applications in shipbuilding, automotive, constructions, aerospace and other industrial sectors. In applications like aerospace, marine and automotive industries, there is a need to join components made of different aluminium alloys, viz. AA6061 and AA5083. In this study friction stir welding (FSW) is used to join dissimilar plates made of AA6061-T6 and AA5083-O. The effect of varying tool pin profile, tool rotation speed, tool feed rate and tilt angle of the tool has been investigated on the tensile strength and percentage elongation of the welded joints. Box-Behkan design, with four input parameters and three levels of each parameter has been employed to decide the set of experimental runs. The regression models have been developed to investigate the influence of welding variables on the tensile strength and elongation of the welded joint. It is revealed that with the increase in welding parameters like tool rpm, tool feed rate and tilt angle of the tool, both the mechanical properties increase, reach a maximum level, followed by a decrease with further increase in the value of parameters. Amongst different types of tool pin profiles used, the FSW tool having straight cylindrical (SC) pin profile is found to yield the maximum strength and elongation of the welded joint for different combinations of welding parameters. Multiple response optimization indicates that the maximum UTS (135.83 MPa) and TE (4.35%) are obtained for the welded joint fabricated using FSW tool having SC pin profile, tilted at 1.11° and operating at tool speed and feed rate of 1568 rpm and 39.53 mm/min., respectively.

Diffusional relaxation around a second phase particle

1980 ◽  
Vol 28 (3) ◽  
pp. 319-325 ◽  
Author(s):  
T. Mori ◽  
M. Okabe ◽  
T. Mura
Keyword(s):  
Phase Particle ◽  
Second Phase ◽  
Diffusional Relaxation
Sign in / Sign up

Export Citation Format

Share Document