Characterizations of microstructure, crystallographic texture and mechanical properties of dissimilar friction stir welding joints for AA2024 and AA7075 under different tool shoulder end profiles

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Zhang, ChenghangKTH,Materialvetenskap,International Joint Laboratory for Light Alloys (MOE), College of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR China b Shenyang National Laboratory for Materials Science, Chongqing University, Chongqing 400044, PR China (författare)

QC 20201230
In this investigation, the influence of tool shoulder end profiles (concentric circle shoulder-CCS and three-helix shoulder-THS) and rotational speed (ROSP, 800, 1100, 1400 rpm) on microstructure and mechanical performance of the dissimilar FSW AA2024/7075 joints was analyzed in detail. The results indicated that the width of thermos-mechanical affected zone and the average grain size of nugget zone (NZ) in the CCS joints are lower than those in the THS joints, and they all increase with increasing the ROSP. There is a difference on the shear texture types generated in the different positions of the NZ in the CCS and THS joints. Tensile properties of the joints fabricated by employing the CCS tool are excellent compared to the THS tool. The maximum welding efficiency about 90.8 % can be obtained in the CCS joint at 1000 rpm. The fracture mode of the CCS and THS joints is ductile and brittle failure, respectively.

TEKNIK OCH TEKNOLOGIER Materialteknik Bearbetnings-, yt- och fogningsteknik hsv//swe
ENGINEERING AND TECHNOLOGY Materials Engineering Manufacturing, Surface and Joining Technology hsv//eng
Aluminum alloys
Friction stir welding
Mechanical properties
Microstructure
Texture
Tool shoulder end profile
Textures
Average grain size
Brittle failures
Concentric circles
Crystallographic textures
Dissimilar friction stir welding
Fracture mode
Mechanical performance
Rotational speed

Huang, GuangjieInternational Joint Laboratory for Light Alloys (MOE), College of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR China b Shenyang National Laboratory for Materials Science, Chongqing University, Chongqing 400044, PR China (författare)
Cao, YuInternational Joint Laboratory for Light Alloys (MOE), College of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR China b Shenyang National Laboratory for Materials Science, Chongqing University, Chongqing 400044, PR China (författare)
Li, QileiInternational Joint Laboratory for Light Alloys (MOE), College of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR China b Shenyang National Laboratory for Materials Science, Chongqing University, Chongqing 400044, PR China (författare)
Niu, LiqiangInternational Joint Laboratory for Light Alloys (MOE), College of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR China b Shenyang National Laboratory for Materials Science, Chongqing University, Chongqing 400044, PR China (författare)
Liu, QingCollege of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, PR China (författare)
KTHMaterialvetenskap (creator_code:org_t)

Av författaren/redakt...: Zhang, Chenghang; Huang, Guangjie; Cao, Yu; Li, Qilei; Niu, Liqiang; Liu, Qing

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