Iron aluminides

Iron alloys, selenium and metallurgy of, 22 98. See also Ferrosilicon Iron aluminide... 

Rabin, B. H., and Wright, R. N., Synthesis of iron aluminides from elemental powders reaction mechanisms and densification behavior. Metall. Trans. A, 22A, 277 (1991). 

Since a general understanding is that the strength of iron aluminides is lower than that of other aluminides of interest, the relevant research is relatively few. However, an excellent resistance to oxidation and corrosion was reported for iron aluminide of p-Fe-A1 type by Okada et al. [66] together with their mechanical properties at high temperatures. 

High Temperature Corrosion Behaviour of Iron Aluminides and Iron-Aluminium Chromium Alloys... 

There should be no significant difference between alumina scales formed on nickel aluminide and those formed on iron aluminide. Compared to Ni3Al, however, Fe3Al has some major advantages ... 

The metal activity of iron aluminides is about two orders of magnitude higher than that of nickel aluminide, as can be seen in Fig. l.The higher metal activity results in a higher thermodynamical stability of iron aluminides. 

The high temperature corrosion behaviour of different iron aluminides and iron-aluminium-chromium alloys containing 6-17 wt% aluminium, 2-10 wt% chromium and additions of mischmetal has been investigated in both air and hot process gases. 

A set of four iron aluminides (FA 49, FA 56, FA 57 and FA 58) was supplied by Shell Research, with compositions given in Table 1. These contained about 5 wt% Cr and aluminium concentrations from about 8% to 16 wt%.They all included a small amount of zirconium while three of them also contained yttrium, to assist in maintenance and retention of the protective A1203 scale. For comparison, two other Al203-forming alloys and two Cr203-forming alloys were included in the programme.The former alloys contained much more chromium than the aluminides but much less aluminium MA... 

Examination of the specimens after exposure confirmed that thin protective scales had developed and were retained on the iron aluminides and on the other alloys, except where large weight gains were recorded, in all three environments. The scales on the iron aluminides at 700°C were essentially A1203, as confirmed by X-ray diffraction... 

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