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Interfacial Reactions between Oxygen Containing Fe and Al at the Onset of Liquid Fe Deoxidation by Al Addition

“…The diffusion of Fe atoms in the Al-rich area seems to be much faster than the conventional diffusion process. According to Shahverdi et al,10) Fe is brought to the Al-rich area through the breakage, flotation, re-melting and dissolution of FeAl 3 into molten Al. Under the present conditions, the flotation of Al-rich intermetallics in liquid Al seems not possible owing to their higher densities compared to liquid Al.…”

“…[10][11][12][13][14] The interfacial reactions in this binary system have implications on many processes including aluminizing, mold casting, bimetals fabrication, joining and welding, etc. The types of interfacial phases formed, their morphology as well as their kinetics of growth were examined.…”

Microstructures and Mechanical Properties of Plasma Arc Welded Joints of Ultra-high Strength Steel and Aluminum Alloy Using Al–Si and Al–Cu Fillers

“…The chemical compositions of the needle-like phase and tongue-like phase are 78.27at.%Al+20.48at.%Fe+ Under nonequilibrium conditions the formation of Fe-Al intermetallic compounds is controlled by not only the thermodynamic factors but also the kinetic factors such as the reaction temperature, hold time and so on. [25][26][27][28] Plasma arc welding is an extremely nonequilibrium process, thus the formation of needle-like Fe 4 Al 13 in the interface layer is related to the high interface reaction temperature, short hold time and fast cooling rate. According to results above, it can be demonstrated that the interface zone consists mainly of Fe 2 Al 5 and Fe 4 Al 13 intermetallic compounds, the tongue-like Fe 2 Al 5 layer at steel base metal side (Fig.…”

Controlling phase formation during aluminium/steel Nd:YAG laser brazing

“…Figure 9 shows the set up of the tensile tests performed on the brazed samples. The joints broke generally at the interface Fe/braze, probably due to the presence of the brittle compounds [9][10][11] and also due to the fact that this kind of tensile tests produce a localized combination of shearing and tensile solicitation at this interface.…”