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Parametric, Mechanical and Metallurgical Characterization of Dissimilar Friction Stir Welded AA2014-AA2219

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Title Parametric, Mechanical and Metallurgical Characterization of Dissimilar Friction Stir Welded AA2014-AA2219
 
Creator Rajagopal, Varthini
Rajendran, Dinesh Kumar
Muthukumaran, S.
 
Subject Al alloys
Characterization
Intermetallic
Dissimilar FSW
RSM-AUGMECON
 
Description 766-779
In this study, Friction stir welding (FSW) is carried out on dissimilar aluminium alloys AA2219 and AA2014 using L16
orthogonal array based on Taguchi Mixed Factorial Design (TMFD) under four process variables: traverse speed, rotational
speed, tilt angle and tool profile and the effects of FSW parameters on single and multiple responses (Tensile Strength,
Yield Strength and Elongation) are analyzed using Response Surface Methodology (RSM) coupled with Augmented Epsilon
Constraint Method (AUGMECON). Highest tensile strength and superior percentage elongation are attained at the
parameter setting- 1400rpm Rotational Speed, 300mm/min Welding Speed, Tapered Threaded Pin tool profile and 3º Tilt
Angle. Maximum yield strength is achieved under the parameter setting 800rpm Rotational Speed, 300mm/min Welding
Speed, Tapered Threaded Pin tool and 3º Tilt Angle. A set of 20 optimal Pareto solutions providing a trade-off between the
responses was generated. The rotation speed and tool tilt angle determined the trade-off between the extreme Pareto
solutions. The microstructural analysis indicates finer grains in the bottom half compared to the top, with improved bonding
between AA2219 and AA2014 in the nugget zone. Micro-hardness analysis reveals hardness similar to the parent material in
the retreating side and poor hardness in the advancing side, where failures occur. SEM fractography shows a mixed ductile
brittle fracture with elongated grains and uniform dispersion of intermetallics. Optimized parameters result in a disk-like
planar morphology with a copper-rich GP zone, leading to improved strength and hardness. EDS mapping confirms
presence of uniformly dispersed copper particles in the crater region that acts as a binder and resists void formation. XRD
analysis further confirms the presence of Al2Cu intermetallic phases.
 
Date 2024-02-21T06:25:12Z
2024-02-21T06:25:12Z
2024-02
 
Type Article
 
Identifier 0975-1017 (Online); 0971-4588 (Print)
http://nopr.niscpr.res.in/handle/123456789/63360
https://doi.org/10.56042/ijems.v30i6.2528
 
Language en
 
Publisher NIScPR-CSIR,India
 
Source IJEMS Vol.30(6) December