Effect of processing parameters on the corrosion behaviour of friction stir processed AA 2219 aluminum alloy

Surekha, K.; Murty, B.S.; Rao, K. Prasad

doi:10.1016/j.solidstatesciences.2008.11.007

Cited by 108 publications

(34 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, there is another possibility that the coarse precipitates are broken up to much finer ones due to the characteristics of FSW. In this regard, it is reported that FSW can be a unique approach in modifying the as-cast and other structures by refining the coarse particles [15][16][17][18][19][20][21][22]. For example, Mehranfar and Dehghani [23] reported that the friction stir processing (FSP) of superaustenitic steels resulted in significant refining of sigma phases even to nanoscale.…”

Section: Microstructural Evolutionsmentioning

confidence: 99%

Microstructural evolution and mechanical properties during the friction stir welding of 7075-O aluminum alloy

Dehghani

Ghorbani

Soltanipoor³

2014

Int J Adv Manuf Technol

View full text Add to dashboard Cite

In the present work, the AA7075-O was subjected to friction stir welding. The rotating and welding speeds were 630 rpm and 32 mm/min, respectively. The diameters of shoulder and pin were 30 and 5.7 mm, respectively. The length of threaded pin was 4.8 mm. The tensile, bending, and hardness tests were carried out on the friction stirwelded specimens. The results show that the strength of friction stir-welded sample was about 15 % (i.e., 25 MPa) higher than that of base metal. By contrast, the ductility of base metal was as much as twice that of friction stirwelded one. According to the obtained hardness profile, the maximum hardness was obtained for the stirred zone with a continuous decrease toward the base metal. This resulted in the formation of cracks after bending specimens prepared from weldment, while there was no sign of crack in the bent specimens taken from base metal. Besides, there are microstructural evolutions from the weldment toward the base metal. These include the variations in the size and distribution of precipitates. The precipitates were coarser in the heat-affected zone, while they were finer in the stirred zone.

show abstract

Section: Microstructural Evolutionsmentioning

confidence: 99%

Microstructural evolution and mechanical properties during the friction stir welding of 7075-O aluminum alloy

Dehghani

Ghorbani

Soltanipoor³

2014

Int J Adv Manuf Technol

View full text Add to dashboard Cite

show abstract

“…At the same time, the second phases containing active elements and inactive elements forma corrosion galvanic couple. The second phases containing the inactive elements become the cathode, and the second phases containing the active element, as an anode, form anodic dissolution [26,[28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of Keyhole-Free Friction Stir Spot Welded Joints of Dissimilar 6082 Aluminum Alloy and DP600 Galvanized Steel in 3.5% NaCl Solution

Zhang

et al. 2017

Metals

View full text Add to dashboard Cite

Abstract:The corrosion behavior of keyhole-free friction stir spot welded joints of dissimilar 6082 aluminum alloy and DP600 galvanized steel in 3.5% NaCl solution has been investigated by the immersion test and electrochemical analysis. The surface of the aluminum alloy produced exfoliation and pitting corrosion. The pitting occurred seriously on the interface of the 6082 aluminum alloy, but the steel had no corrosion. The corrosion galvanic couples were formed between elements of Si and Fe with a high electrode potential, and Mg and Al with a low electrode potential, around them. Mg and Al elements of Mg 2 Si and Si-containing solid-solution phase α (Al) preferentially became an anodic dissolution and formed exfoliation corrosion around the Si elements. Fe-rich phase θ (Al 3 Fe) as the cathode caused corrosion of Mg and formed pitting around Mg-rich phase β (Al 3 Mg 2 ) as the anode. The sequence of the corrosion resistance of different areas of the joints (with decreasing corrosion resistance) was WNZ (Weld Nugget Zone) > TMAZ (Thermo-mechanically Affected Zone) > BM (Base Metal) > HAZ (Heat-affected Zone). The joints of keyhole-free FSSW (Fiction Stir Spot Welding) of dissimilar 6082 aluminum alloy and DP600 galvanized steel have better corrosion resistance than base metal in 3.5% NaCl solution.

show abstract

“…Understanding of effect of material flow on the microstructural changes is very limited with respect to aluminium alloys [3][4][5][6].Tool pin profile strongly influences the microstructure changes in weld nugget of friction stir welds and thus plays an important role in corrosion behaviour. The microstructure heterogeneity of friction stir welds is significant in determining the corrosion properties of AA2219 alloy owing to the galvanic coupling between the noble CuAl 2 precipitate and the surrounding matrix [7][8][9][10].Most of the previous investigations on the design of tool geometry were focused on optimizing the tool pin profile with respect to microstructure and mechanical properties [11][12][13][14]. A detailed review of tool design was reported on the geometrical features of the tool pin (including threads, flutes, flats, whorls, flares and skew on cylindrical or cone-frustum-shaped pins with rounded or flat bottom) and shoulder (including M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 3 ridges, grooves, knurling and scrolls) [15][16].…”

Section: Introductionmentioning

confidence: 99%

Influence of tool pin profile on microstructure and corrosion behaviour of AA2219 Al–Cu alloy friction stir weld nuggets

2015

View full text Add to dashboard Cite

To overcome the problems of fusion welding of aluminium alloys, the friction stir welding (FSW) is recognized as an alternative joining method to improve the mechanical and corrosion properties. Tool profile is one of the important variables which affect the performance of the FS weld. In the present work the effect of tool profile on the weld nugget microstructure and pitting corrosion of AA2219 aluminum -copper alloy was studied. FSW of AA2219 alloy was carried out using five profiles, namely conical, square, triangle, pentagon and hexagon. The temperature measurements were made in the region adjacent to the rotating pin. It was observed that the peak temperature is more in hexagonal tool pin compared to the welds produced with other tool pin profiles. It is observed that the extensive deformation experienced at the nugget zone and the evolved microstructure strongly influences the hardness and corrosion properties of the joint during FSW. It was found that the microstructure changes like grain size, misorientation and precipitate dissolution during FSW influence the hardness and corrosion behaviour. Pitting corrosion resistance of friction stir welds of AA 2219 was found to be better for hexagon profile tool compared to other profiles, which was attributed to material flow and strengthening precipitate morphology in nugget zone. Higher amount of heat generation in FS welds M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 2 made with hexagonal profile tool may be the reason for greater dissolution of strengthening precipitates in nugget zone.

show abstract

Effect of processing parameters on the corrosion behaviour of friction stir processed AA 2219 aluminum alloy

Cited by 108 publications

References 23 publications

Microstructural evolution and mechanical properties during the friction stir welding of 7075-O aluminum alloy

Microstructural evolution and mechanical properties during the friction stir welding of 7075-O aluminum alloy

Corrosion Behavior of Keyhole-Free Friction Stir Spot Welded Joints of Dissimilar 6082 Aluminum Alloy and DP600 Galvanized Steel in 3.5% NaCl Solution

Influence of tool pin profile on microstructure and corrosion behaviour of AA2219 Al–Cu alloy friction stir weld nuggets

Contact Info

Product

Resources

About