Comprehensive microstructural evolution analysis of AA5083-H116 alloy welded joints using pulsed GMAW and 80Ar19He1O2 shielding gas
Source abstract
Abstract
ABSTRACT This study investigates the microstructural evolution of AA5083-H116 butt-welded joints produced by automated pulsed GMAW (GMAW-P) with an 80Ar-19He-1O 2 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 (Al 3 Mg 2 , Al 6 (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.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Welding Techniques and Residual Stresses · Advanced Welding Techniques Analysis · Aluminum Alloy Microstructure Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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