<div class="csl-bib-body">
<div class="csl-entry">Krisam, S., Hanka Becker, Zahra Silvayeh, Domitner, J., & Povoden-Karadeniz, E. (2022, September 29). <i>Formation of the intermetallic seam and the long-range ordered η’’’-Fe2(Al,Si)5 phase in dissimilar weld joints of aluminum-steel sheets using silicon-rich and silicon-poor fillers</i> [Conference Presentation]. MSE 2022, Darmstadt, Germany.</div>
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/153727
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dc.description.abstract
Controlling the thickness of the intermetallic seam, which forms in the thermal joining of aluminum alloys with steels, is crucial for achieving high-quality joints, as thick seams may significantly impair the mechanical properties of dissimilar joints. The seam thickness is influenced considerably by the temperature-time cycle of the welding process and by the composition of the aluminum-based filler. Fillers alloyed with Silicon are known to reduce the thickness, as they decrease the growth rates of the common intermetallic layer components η-Fe2Al5 and θ-Fe4Al13, with η-Fe2Al5 usually being the dominant phase. The presence of Si also leads to the formation of additional intermetallic phases at the θ/Al-alloy interface, the αc-Al(Fe,Mn)Si phase. Moreover, Silicon is found to be incorporated in long-range ordered regions of the Fe2Al5 phase.
This study investigates the effect of varying silicon content in silicon-rich Al bal.-3Si-Mn and silicon-poor Al bal.-4.5Mg-Mn-Zr (wt.%) fillers during welding on the formation of the intermetallic seam.
The intermetallic layers formed during Cold Metal Transfer welding of aluminum-steel sheets using both were researched using Transmission Electron Microscopy - Selected Area Electron Diffraction patterns. The patterns revealed that grains with areas of short-range η-Fe2Al5 and long-range ordered η’’’-Fe2Al5 phase formed. Using Al-3Si-Mn filler, Si has been measured within Fe2Al5 grains by wavelength dispersive X-ray spectroscopy. A detailed analysis by Transmission Electron Microscopy – Electron Dispersive X-Ray Spectroscopy, and Electron Energy Loss Spectroscopy was conducted along regions of short-range and long-range ordered areas of Fe2Al5 grains. It was observed that more Silicon is contained in the long-range ordered η’’’-area, likely exchanging with Al, which suggests the phase formula Fe2(Al,Si)5. These results indicate a correlation between the presence of Silicon and the occurrence of the disordered and the long-range ordered η’’’-Fe2(Al, Si)5 phase.
Electron Backscatter Diffraction confirmed αc-Al(Fe,Mn)Si exclusively in the weld sample with high-Si filler at the θ/Al-alloy interface.
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dc.language.iso
en
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dc.subject
Al5Fe2
en
dc.subject
Intermetallics
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dc.subject
ordering
en
dc.subject
TEM
en
dc.subject
SAED
en
dc.title
Formation of the intermetallic seam and the long-range ordered η’’’-Fe2(Al,Si)5 phase in dissimilar weld joints of aluminum-steel sheets using silicon-rich and silicon-poor fillers
en
dc.type
Presentation
en
dc.type
Vortrag
de
dc.type.category
Conference Presentation
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tuw.researchTopic.id
M2
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tuw.researchTopic.name
Materials Characterization
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tuw.researchTopic.value
100
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tuw.publication.orgunit
E308 - Institut für Werkstoffwissenschaft und Werkstofftechnologie