Microstructure and tensile properties of friction welded aluminum alloy AA7075-T6

Rafi, H. Khalid; Ram, G.D. Janaki; Phanikumar, Gandham; Rao, K. Prasad

doi:10.1016/j.matdes.2009.11.065

Cited by 119 publications

(49 citation statements)

References 18 publications

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“…In the TMAZ, the material experiences lesser amount of strain and strain rate as compared to the NZ and the pancake-shaped grains along the interference between the NZ and TMAZ are elongated and bent, so it does appear that FSW causes drastic distortion in the elongated grains [9,20]. In addition, the grain structure in the HAZ is closer to that in the base metal than other regions [21,22]. In the TMAZ, the material experiences lesser amount of strain and strain rate as compared to the NZ and the pancake-shaped grains along the interference between the NZ and TMAZ are elongated and bent, so it does appear that FSW causes drastic distortion in the elongated grains [9,20].…”

Section: Methodsmentioning

confidence: 99%

“…In the TMAZ, the material experiences lesser amount of strain and strain rate as compared to the NZ and the pancake-shaped grains along the interference between the NZ and TMAZ are elongated and bent, so it does appear that FSW causes drastic distortion in the elongated grains [9,20]. In addition, the grain structure in the HAZ is closer to that in the base metal than other regions [21,22]. Figure 1b shows the weld area, where it can be observed that the weld line is free of common defects present in conventional welding processes including intergranular cracks.…”

Section: Methodsmentioning

confidence: 99%

“…The base metal consists of pancake-shaped grains elongated in the rolling direction, as can be seen in Figure 1c, and the grain structure in the nugget zone, shown in Figure 1d, shows that the grains are extremely fine, so much so that the grain size could not be measured by conventional optical methods. However, in literature, an average 0.5-10 µm is reported for the grain dimension in this area after a single pass of FSW [21][22][23][24]. Generally, the grain size in the NZ is determined by two main thermomechanical factors; the heat input and the degree of plastic deformation.…”

Section: Methodsmentioning

confidence: 99%

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A Microstructural Evaluation of Friction Stir Welded 7075 Aluminum Rolled Plate Heat Treated to the Semi-Solid State

Chegeni

Kapranos

2018

Metals

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Two rolled plates of 7075 aluminum alloy were used as starting material. The plates were welded using a simultaneous double-sided friction stir welding (FSW) process. One way of obtaining feedstock materials for Semi-solid processing or thixoforming is via deformation routes followed by partial melting in the semi-solid state. As both the base plate materials and the friction weld area have undergone extensive deformation specimens were subjected to a post welding heat-treatment in the semi-solid range at a temperature of 628 • C, for 3 min in order to observe the induced microstructural changes. A comparison between the microstructural evolution and mechanical properties of friction stir welded plates was performed before and after the heat-treatment in the Base Metal (BM), the Heat Affected Zone (HAZ), the Thermomechanically Affected Zone (TMAZ) and the Nugget Zone (NZ) using optical microscopy, Scanning Electron microscopy (SEM) and Vickers hardness tests. The results revealed that an extremely fine-grained structure, obtained in the NZ after FSW, resulted in a rise of hardness from the BM to the NZ. Furthermore, post welding heat-treatment in the semi-solid state gave rise to a consistent morphology throughout the material which was similar to microstructures obtained by the thixoforming process. Moreover, a drop of hardness was observed after heat treatment in all regions as compared to that in the welded microstructure.

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Section: Methodsmentioning

confidence: 99%

“…In the TMAZ, the material experiences lesser amount of strain and strain rate as compared to the NZ and the pancake-shaped grains along the interference between the NZ and TMAZ are elongated and bent, so it does appear that FSW causes drastic distortion in the elongated grains [9,20]. In addition, the grain structure in the HAZ is closer to that in the base metal than other regions [21,22]. Figure 1b shows the weld area, where it can be observed that the weld line is free of common defects present in conventional welding processes including intergranular cracks.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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A Microstructural Evaluation of Friction Stir Welded 7075 Aluminum Rolled Plate Heat Treated to the Semi-Solid State

Chegeni

Kapranos

2018

Metals

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“…Rafi et al [34] investigated friction welding of AA7075-T6 rods of 13 mm diameter with an aim to understand the effects of process parameters on weld microstructure and tensile properties. The results show that sound joints in AA7075-T6 can be achieved using friction welding, with a joint efficiency of 89% in as-welded condition with careful selection of process parameters.…”

Section: Kumar Et Almentioning

confidence: 99%

Review of Experimental Investigations in Friction Welding Technique

Shinde

Dabeer

2017

IRA-JTE

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“…These usually occur when welding workpiece at low melting point because the heat input from the welding place is not sufficient and the upset pressure while welding is not high enough. Over the past several years, non-ferrous materials such as titanium alloy [4], magnesium alloy [5][6][7] and aluminum alloy [8][9][10][11][12] turn popular to this RFW method because it is widely used, especially aluminum alloy in automotive industry, marine industry and the aircraft industry [13]. Aluminum-Silicon was used in this industry because of its high strength, lightweight and corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Rotary Friction Welding of Dissimilar Joints between SSM356 and SSM6061 Aluminium Alloys Produced by GISS

Chainarong¹,

Meengam²,

Tehyo³

2017

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Abstract. The objective of research to investigate the parameters, microstructure and mechanical properties of butt joint SSM356 with SSM6061 aluminum alloy by using RFW processes. The main parameters such as rotation speeds are 1550, 1700 and 1850 rpm, burn-off length are 2, 2.5 and 3 mm respectively. For experiment found that, both materials have weld ability to get along well though it has a different chemical composition, the changes in welded metals microstructures occurs deformation leads to smaller particle size. The average dimensions of Mg2Si particles were measured at 0.998 µm long and 1.021 µm wide when one of the workpiece was rotated at 1850 rpm with 2.5 mm burn-off length. The maximum average tensile strength is 87.24 MPa, efficiency of the weld joints is 51.89 percent compared with the base metal of SSM356 aluminum alloys, (base metal is 168.12 MPa) and efficiency of the weld joints is 68.45 percent compared with the base metal of SSM6061 aluminum alloys (base metal is 127.44 MPa). Furthermore, small particles distributed in the weld metal promotes increasing hardness property up to 65.56 HV in the weld metal as compared with those of the base metals.

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Microstructure and tensile properties of friction welded aluminum alloy AA7075-T6

Cited by 119 publications

References 18 publications

A Microstructural Evaluation of Friction Stir Welded 7075 Aluminum Rolled Plate Heat Treated to the Semi-Solid State

A Microstructural Evaluation of Friction Stir Welded 7075 Aluminum Rolled Plate Heat Treated to the Semi-Solid State

Review of Experimental Investigations in Friction Welding Technique

Rotary Friction Welding of Dissimilar Joints between SSM356 and SSM6061 Aluminium Alloys Produced by GISS

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