Microstructure and mechanical properties of friction spot welding aluminium–lithium 2A97 alloy

Gao, Chong; Gao, Rongqiang; Ma, Yuanyuan

doi:10.1016/j.matdes.2015.06.013

Cited by 42 publications

(7 citation statements)

References 36 publications

(45 reference statements)

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“…It revealed that ß″phase from the rotation welding speed of 2,500 rpm and welding rotation time of 90 seconds possessed small particle sizes and tiny gaps inserted among the α-phase, whereas the big particles of ß″-phase and large gaps were observed at 1,240 rpm rotation welding speed and 60 second welding time. The small ß″- phase strengthened the hardness of specimens, whereas the large void weakened the shear tensile strength as well [26]. Fig.…”

Section: Characteristics Of Microstructure After Weldingmentioning

confidence: 86%

The Influence of Parameters Affecting Mechanical Properties and Microstructures of Semi-Solid-Metal 7075 Aluminum Alloy by Using Friction Stir Spot Welding

Sitthipong¹,

Towatana²,

Meengam³

et al. 2018

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This research aims to study the influence of parameters that affect the mechanical properties of semi-solid-metal 7075 aluminum alloy with friction stir spot welding process. The parameters for this experiment such as rotation welding speed at 380, 760, 1240 and 2500 rpm and welding time at 60, 90 and 120 seconds were employed respectively. The study found that the welded specimens at all the conditions can be welded very well. Moreover, friction stir spot welding process showed that the hardness in weld zone had an average value at 79.83 HV which is lower than the hardness of the base metal. The shear tensile strength of the welded specimens had the average value approximately 194.20 MPa at rotation welding speed of 2500 rpm, welding time of 90 seconds and plunge of depth of 2 millimetres. The microstructure in the weld zone and thermal mechanical affected zone were deformed permanently. Therefore, friction stir spot welding process of this aluminum alloy provided good effects on mechanical properties. Statistical analysis showed that the coefficient of determination R-square was equal to 93.50 percent. This means that the variations of the experiments were controllable, such as equipment or other factors in the experiment. For the remaining, only 6.50 percent was uncontrolled factors.

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Section: Characteristics Of Microstructure After Weldingmentioning

confidence: 86%

The Influence of Parameters Affecting Mechanical Properties and Microstructures of Semi-Solid-Metal 7075 Aluminum Alloy by Using Friction Stir Spot Welding

Sitthipong¹,

Towatana²,

Meengam³

et al. 2018

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“…The microstructure and mechanical properties of the friction stir welded and laser welded 2A97 Al‐Li alloy were investigated. And the favorable welding parameters were achieved (Chen, Fu, & Liang, 2017; Chen, Fu, Liang, & Liu, 2017; Chen, Hu, He, Wu, & Fu, 2018; Gao, Gao, & Ma, 2015).…”

Section: Introductionmentioning

confidence: 99%

Mechanisms and microstructures of 2A97 Al‐Li alloy under the hot forming with synchronous quenching process

Zhang

Chen

et al. 2020

Microscopy Res & Technique

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Aluminum‐lithium alloy is regarded as the most promising light material in the aircraft and aerospace industries. For the production of complex and high‐precision parts, the hot forming with synchronous quenching (HFSQ) process has become an effective and attractive forming method. In order to achieve the performance and microstructure evolution of the 2A97 Al‐Li alloy under the HFSQ process, the specimens were subjected to solution treatment at 520°C and held at 90 min in the Gleeble 3,500 thermal simulator. Then the hot tensile test with simultaneous quenching was conducted directly at a temperature of 300–500°C and a strain rate of 0.1–0.001 s−1 with the same equipment. Through analyzing the macroscopic stress–strain curves and microscopic fractures, it was concluded that the optimal forming temperature was 450°C with the strain rate being 0.1 s−1 and its forming mechanism under the process was presented. To obtain the microstructure evolution of 2A97 Al‐Li alloy under the HFSQ process, the material was subjected to constant strain tensile test with synchronous quenching and then treated with two‐stage artificial aging 200°C and 6 hr + 165°C and 6 hr. The microstructure of the alloy was observed by means of electron backscattering diffraction (EBSD). And its evolution process and the influence of temperature, strain rate, and strain on the microstructure under the process were attained.

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“…Aluminium lithium alloys are a promising material from the above mentioned point of view [1]. The application of aluminium lithium alloys is advantageous due to low density, high specific strength, high Young's modulus and increased corrosion resistance [2][3][4][5][6][7][8]. It is known that the addition of 1 wt.…”

Section: Introductionmentioning

confidence: 99%

“…% of lithium could result in the decrease of the alloy density by 3 %. Currently, the 3rd generation of aluminium lithium alloys is under development [9]. Important alloys that could be applied in the fuselage's skin stringer components of the newly developed generation are 2099 and 2199 [10].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Properties of Aw2099 Aluminium-Lithium Alloy Welded by Laser Beam With Aw5087 Aluminium-Magnesium Filler Material

2019

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EN AW2099 aluminium lithium alloy, 2.0mm in thickness, was used as an experimental material. EN AW2099 belongs to the 3rd generation of aluminium lithium alloys. The third generation was developed to improve the disadvantages of the previous generation, such as anisotropy in mechanical properties, low fracture toughness, corrosion resistance and resistance to fatigue crack growth, as well. Aluminium magnesium 5087 filler wire with a diameter of 1.2mm was used for the welding. Crack free weld joints were produced after an optimization of welding parameters. The microstructure of weld metal and mechanical properties of weld joints were investigated. Equiaxed zone (EQZ) was observed at the fusion boundary. The character of grains changed in the direction towards the weld centre, from the columnar dendrite zone to equiaxed dendrite zone in the weld centre. The microstructure of the weld metal matrix consisted of -aluminium. Alloying elements enrichment was found at the inter-dendritic areas, namely copper and magnesium. The microhardness decrease in the weld metal due to a dissolution of strengthening precipitates was measured. The microhardness was slightly higher in comparison to a weld produced by a laser welding without a filler material. The tensile strength of the weld joint reached around 67% of the base material’s strength and the fracture occurred in the weld metal.

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Microstructure and mechanical properties of friction spot welding aluminium–lithium 2A97 alloy

Cited by 42 publications

References 36 publications

The Influence of Parameters Affecting Mechanical Properties and Microstructures of Semi-Solid-Metal 7075 Aluminum Alloy by Using Friction Stir Spot Welding

The Influence of Parameters Affecting Mechanical Properties and Microstructures of Semi-Solid-Metal 7075 Aluminum Alloy by Using Friction Stir Spot Welding

Mechanisms and microstructures of 2A97 Al‐Li alloy under the hot forming with synchronous quenching process

Analysis of the Properties of Aw2099 Aluminium-Lithium Alloy Welded by Laser Beam With Aw5087 Aluminium-Magnesium Filler Material

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