Comprehensive microstructural evolution analysis of AA5083-H116 alloy welded joints using pulsed GMAW and 80Ar19He1O2 shielding gas

Comprehensive microstructural evolution analysis of AA5083-H116 alloy welded joints using pulsed GMAW and 80Ar19He1O2 shielding gas

This study investigates the microstructural evolution of AA5083-H116 butt-welded joints produced by automated pulsed GMAW (GMAW-P) with an 80Ar-19He–1O2 shielding gas under varying heat inputs. Multiscale characterization techniques—including optical and scanning electron microscopy, EBSD, XRD, and...

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Bibliographic Details
Main Authors: Enrique Esteban Niebles-Nuñez, Jimy Unfried-Silgado, Jaime Elías Torres-Salcedo, Conrado R.M. Afonso, Antonio J. Ramírez
Format: Article
Language:English
Published: Elsevier 2025-09-01
Series:Journal of Materials Research and Technology
Subjects:
AA5083-H116 welded joints
GMAW-P
Microstructural evolution
Recrystallization and grain growth
Intermetallic precipitates
Online Access:http://www.sciencedirect.com/science/article/pii/S2238785425019192
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Summary:This study investigates the microstructural evolution of AA5083-H116 butt-welded joints produced by automated pulsed GMAW (GMAW-P) with an 80Ar-19He–1O2 shielding gas under varying heat inputs. Multiscale characterization techniques—including optical and scanning electron microscopy, EBSD, XRD, and transmission electron microscopy (TEM) along with automated crystallographic mapping (ASTAR), were used to assess recrystallization, phase transformations, and grain growth. The coarse-grained zone (GGZ) exhibited complete recrystallization and abnormal grain growth (14.2–18.6 μm), with low misorientation (≈2°) and dominant low-angle boundaries (<7°). The mixed grain zone (MGZ) showed partial recrystallization and subgrains, while the fine-grained zone (GFZ) displayed incipient recrystallization (2°–10°) and residual substructures near the base metal. The Al-FCC matrix retained Mg in solid solution, with secondary phases (Al(Fe,Mn), Al(Fe,Mn,Cr) and nanoscale precipitates (Al3Mg2, Al6(Mn,Fe)) at grain boundaries. Results demonstrate that heat input critically governs microstructural stability, dictating recrystallization kinetics and precipitate distribution. These findings enable optimized welding parameters to enhance joint performance in demanding naval, aerospace, and automotive applications.
ISSN:2238-7854

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