Ordering effects in the Fe-Al system

Abstract

Résumé. 2014

Systematic study of the reordering process in FeAl alloys by neutron diffraction

“…The formation of B2 precipitates and therefore, the increase of the B2 ordered phase together with the decrease of the A2 disordered phase might be one of the reasons for the abrupt change in the magnetism observed in the sample [4]. This agrees with Kuentzler [8] who has established that the order has a tendency to reduce the number of FeFe nearest-neighbors, which reduces the number of Fe-Fe couplings and therefore, the tendency to ferromagnetism.…”

Electronic and magnetic properties of AlFe3 and AlFe3N nitride

“…On the other hand the bulk modulus for the ferromagnetic state of AlFe 3 in the fcc structure calculated by FPLAPW method is greater than the value obtained by Hsu et al [33] for the AlFe 3 in the DO 3 structure, 166 GPa, through FPLAPW calculations. Other previously reported theoretical bulk modulus values for AlFe 3 in the DO 3 structure are 159 GPa [42] and 183 GPa [43]. As seen in Table 1, in general the bulk moduli obtained from LMTO total energy calculations are greater than those values obtained through a FPLAPW total energy calculations.…”

Hot-Dip Aluminizing on AISI F55–UNS S32760 Super Duplex Stainless Steel Properties: Effect of Thermal Treatments

“…On the other hand, this effect is balanced by the melting tendency of aluminum-rich intermetallic compounds, which are generated by the interaction of aluminum with the investigated alloy. This second feature is described by phase diagrams (Figure 13) for systems similar to the tested alloy and the limiting melting temperature for aluminum-rich intermetallic can be identified at 1160 • C [37][38][39][41][42][43]. At 1100 • C working temperature, the contact angle tests display a strong interaction between the liquid aluminum and the super duplex stainless steel substrate, involving a chemical contribution [31,44].…”

“…Since they are not stoichiometric (the alloying metallic atoms could be Me = Fe, Cr, etc. ), the intermetallic phase may be identified by aluminum atomic percentage [37][38][39]. Finally, a SEM/EBSD map has been collected at the surficial aluminum-rich layers of the super duplex stainless steel substrates of the sample annealed at 1080 • C for 360 s/mm and aluminized at 1100 • C for 2700 s, to identify and quantify through diffraction the constituent phases.…”