Intermetallic compound layer growth between solid iron and molten aluminium

Morphology of Compounds Formed by Isothermal Reactive Diffusion between Solid Fe and Liquid Al

“…In Fig. 7 reported by Bouché et al 69) In the present study, f almost discontinuously decreases from 1 to 0 with increasing value of r at r ¼ 1. On the other hand, in the study by Bouché et al, 69) f gradually decreases from 1 to 0 with increasing value of r from r ¼ 0:2 to r ¼ 1:4{1:7.…”

“…The reactive diffusion between liquid Al and solid Fe or Fe-base alloys has been experimentally studied by many researchers. [62][63][64][65][66][67][68][69][70][71][72] In an experiment by Bouché et al, 69) Fe/Al diffusion couples were prepared by a melt bath technique, and then isothermally annealed at temperatures of 973-1173 K. A similar experiment was conducted by Bouayad et al 71) In the binary Fe-Al system, 1) FeAl 3 , Fe 2 Al 5 , FeAl 2 and FeAl are the stable compounds at these temperatures. According to their experimental results, 69,71) however, only Fe 2 Al 5 and FeAl 3 are formed as visible layers at the Fe/Al interface in the diffusion couple owing to annealing.…”

“…Thus, in the isothermal bonding technique, the temperatures of the melt and the solid specimen are equivalent and remain constant during preheating, bonding and annealing. On the other hand, in the melt bath technique, 69,71) the solid specimen is preheated at a certain temperature lower than that of the melt, and then immersed in the melt for annealing. During annealing, compound layers are formed at the interface between the solid specimen and the melt.…”

Influence of Filler Alloy Composition and Process Parameters on the Intermetallic Layer Thickness in Single-Sided Cold Metal Transfer Welding of Aluminum-Steel Blanks

“…[20,21] Among the Al x Fe y phases listed in the binary Al-Fe phase diagram, [35] two main phases were identified in laboratory experiments to form at the interface between solid iron or steel and liquid aluminum or its alloys: Al 5 Fe 2 as the major g-phase [36][37][38] together with Al 3 Fe (also referred to as Al 13 Fe 4 ) as the minor h-phase. [39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55] Both [17][18][19]21,24,27,29] or at least either one [22,23] of these two phases were also found to form during dissimilar CMT welding of aluminum alloys with steel. These experimental studies also show that the interfaces are typically tongue-like between Al 5 Fe 2 and steel, whereas they are finely serrated between Al 3 Fe and aluminum.…”

A study on atomic diffusion behaviours in an Al-Mg compound casting process

“…4 The characteristic of a compound-cast part is the metallurgical formation of interface zones where the cast alloy's components diffuse into the solid material partially via the formation of solid solutions, and partially through the formation of reaction phases. Compound casting has been used to join semi-finished parts with complex structures, simply by casting a metal onto or around a solid shape and many researchers have used this process to join similar and dissimilar metallic couple such as Al/cast iron, 5 Al/Cu, 6 mild steel/Mg-Mn, 7 Al/Al, 8 Mg/Mg 9 and Al/Mg 10 . In these papers, the main content is to study the growth of intermetallic, 5 the distribution of interface 6 and the diffusion rate of different elements 7 .…”