Deformation-induced phase transformations in the Al–Fe system under intensive plastic deformation

Abstract

Mössbauer spectroscopy showed that mechanical activation by compression shear in Bridgman anvils led to deformation-induced dissolution of Al6Fe and Al13Fe4 aluminides and iron in the aluminum matrix, which was followed by formation of an Al–Fe solid solution, Al9Fe2 and Al5Fe2 aluminides, and their defective modifications. The Al6Fe and Al13Fe4 aluminides dissolved with an extraction-type stoichiometry, which was explained by an easier release of aluminum (as compared to iron) to the aluminum matrix and the accompanying precipitation of aluminides owing to saturation of the structure with deformation vacancies. A unified set of metastable phases, which appeared during quick quenching and intensive plastic deformation of the Al–Fe system, pointed to a common diffusion mechanism of the phase transformations.

Protection against corrosion of iron alloys by aluminized coatings produced using two different processes

“…3a, b). In agreement, the Mössbauer spectrum measured for the same abraded sample shows main contributions of Fe 2 Al 5 (doublet μ) [9] and α-Fe (sextet α) (Fig. 4a).…”

Hot Extrusion of Nanostructured Al-Powder Alloys: Grain Growth Control and the Effect of Process Parameters on Their Microstructure and Mechanical Properties

“…As commented earlier, these two features are in agreement with other results reported in the literature, i.e., deformation-induced eutectoid decomposition of the crystalline Al 6 Fe into equilibrium phases [11] decreasing the precipitate particle size with the formation of an Al-Fe solid solution. [12] (2) Figure 3(d), which corresponds to the initial extrusion temperatures, shows the typical SAEDP for the observed particles, showing an [011] zone of Al (white squares) superimposed to the Al 2 Cu [011] axis zone, and that the preferential sites for the nucleation of these precipitates was intragranular, as mentioned earlier herein, with a few precipitates pinning grain boundaries.…”

“…In spite of the low solubility of the Fe in Al, matrix dissolution of Al 6 Fe in the aluminum matrix has already been both observed to occur by eutectoid decomposition of the crystalline Al 6 Fe into equilibrium phases [11] and induced by deformation in this case with the formation of an Al-Fe solid solution, Al9Fe2 and Al5Fe2 aluminides, and their defective modifications. [12] In our samples, the amount of aluminide particles is expected to be very small, justifying that we could not detect them by XRD; the results from TEM analysis will be discussed later. In the case of the Al(Cu), the width as well as the intensity of the Al 2 Cu peak is also reduced, indicating coarsening and dissolution of the precipitates.…”

High Strength and Electrical Conductivity of Al‐Fe Alloys Produced by Synergistic Combination of High‐Pressure Torsion and Aging

“…Processing by HPT has been used in several studies as a powerful tool to obtain microstructure control in disk‐type samples of Al‐Fe alloys . This capability can be extended to larger ring‐type HPT samples, thin rectangular sheets by high‐pressure sliding (HPS), or a continuous method for HPT (C‐HPT) to produce sheets and wires .…”