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

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.

scholarly journals Microstructural Characteristics and Mechanical Properties of Friction Stir Spot Welded 2A12-T4 Aluminum Alloy

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Huijie Liu ◽  
Yunqiang Zhao ◽  
Xingye Su ◽  
Lilong Yu ◽  
Juncai Hou
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Fracture Mode ◽  
Heat Input ◽  
Tensile Shear ◽  
Microstructural Characteristics ◽  
Friction Stir ◽  
Welding Heat Input ◽  
Mixed Fracture ◽  
Spot Welded

2A12-T4 aluminum alloy was friction stir spot welded, and the microstructural characteristics and mechanical properties of the joints were investigated. A softened microstructural region existed in the joint, and it consisted of stir zone (SZ), thermal mechanically affected zone (TMAZ), and heat affected zone (HAZ). The minimum hardness was located in TMAZ, and the average hardness value in SZ can be improved by appropriately increasing welding heat input. The area of complete bonding region at the interface increased with increasing welding heat input because more interface metals were mixed. In a certain range of FSSW parameters, the tensile shear failure load of the joint increased with increasing rotation speed, but it decreased with increasing plunge rate or decreasing shoulder plunging depth. Two kinds of failure modes, that is, shear fracture mode and tensile-shear mixed fracture mode, can be observed in the tensile shear tests, and the joint that failed in the tensile-shear mixed fracture mode possessed a high carrying capability.

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