Evolution of non-dendritic equiaxed zone and its influence on mechanical properties of tungsten inert gas welded dissimilar A6061-T6 and A6082-T6 joint

•Non-dendritic equiaxed zone (EQZ) is evolved in A6061-T6 interface.•Eutectic Si phases along the grain boundaries (GBs) of EQZ are distributed as discontinuous fine particles.•Absence of EQZ improves strength of A6082-T6 interface than the A6061-T6 interface. Non-dendritic equiaxed zone (EQZ) evolu...

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Bibliographic Details
Published in:Materials letters 2021-11, Vol.303, p.130569, Article 130569
Main Authors: Rajeshkumar, R., Niranjani, V.L., Devakumaran, K., Banerjee, Kumkum
Format: Article
Language:English
Subjects:
Dendritic structure
Evolution
Gas tungsten arc welding
Gas welding
Grain boundaries
Interfaces
Materials science
Mechanical properties
Microstructure
Rare gases
Tensile properties
Weld metal
Welded joints
Welding
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Summary:•Non-dendritic equiaxed zone (EQZ) is evolved in A6061-T6 interface.•Eutectic Si phases along the grain boundaries (GBs) of EQZ are distributed as discontinuous fine particles.•Absence of EQZ improves strength of A6082-T6 interface than the A6061-T6 interface. Non-dendritic equiaxed zone (EQZ) evolution and its influence on tensile properties of tungsten inert gas (TIG) welded joint of dissimilar A6061-T6 and A6082-T6 are studied. EQZ is observed in A6061-T6 interface whereas it is completely absent at the A6082-T6 interface. The distribution of fine Si eutectic phases along the grain boundaries (GBs) of EQZ of A6061-T6 interface appearing as discontinuous fine particles but as a continuous layer at most of the dendrite boundaries (DBs) at the center of the weld metal zone (WMZ). The improvement in strength of A6082-T6 interface compared to A6061-T6 interface is mainly attributed to the absence of EQZ in the former interface.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2021.130569