Al-Fe system

Al—Fe. The Al—Fe system (Fig. 10), is important because virtually all commercial aluminum alloys contain some iron [7439-89-6] Fe. The system has a eutectic at 1.9% Fe, but soHd solubiHty of only 0.05% Fe. Consider an alloy containing 0.3% Fe. During solidification, most of the Fe remains ia the Hquid phase until a eutectic of soHd solution plus Al Fe constituent particles free2es. Alternatively, constituents of the metastable Al Fe phase [12005-28-6]... 

Lithium—Aluminum/Metal Sulfide Batteries. The use of high temperature lithium ceUs for electric vehicle appUcations has been under development since the 1970s. Advances in the development of lithium aUoy—metal sulfide batteries have led to the Li—Al/FeS system, where the foUowing ceU reaction occurs. 

Dilatometric methods. This can be a sensitive method and relies on the different phases taking part in the phase transformation having different coefficients of thermal expansion. The expansion/contraction of a sample is then measured by a dilatometer. Cahn et al. (1987) used dilatometry to examine the order-disorder transformation in a number of alloys in the Ni-Al-Fe system. Figure 4.9 shows an expansion vs temperature plot for a (Ni79.9Al2o.i)o.s7Feo.i3 alloy where a transition from an ordered LI2 compound (7 ) to a two-phase mixture of 7 and a Ni-rich f c.c. Al phase (7) occurs. The method was then used to determine the 7 /(7 + 7O phase boundary as a function of Fe content, at a constant Ni/Al ratio, and the results are shown in Fig. 4.10. The technique has been used on numerous other occasions,... 

Figure 4.13. Measured diffusion path between alloys, A and B, in the Ni-Al-Fe system at 1000°C (Cheng and Oayanada 1979).

Figure 10.63 Phase equilibria in the Ni-Al-Fe system from Kainuma et al.

Fig. 6.4 (a) Printing template used for quantifying the optimal stoichiometry in the Co-Al-Fe system where known amounts of the components are printed into individual 3x3 mm. The density of precursor drops (and the resulting stoichiometry) corresponding to each stoichiometry for different thickness is described in reference [58]. (b) False color photocurrent map with no applied bias with 532 nm laser excitation in a 0.1-M NaOH solution. The cathodic photocurrent measured by laser scanning the brightest square of the film is nearly three times that generated by the best pure CuO internal standard labeled Cuj,. The compositions within the solid white box were expanded in Fig. 6.5. Reproduced with permission from [58], copyright 2008 American Chemical Society...

The Al-Cr and Al-Fe systems are accepted from [2006Cor] and [2006MS1T], respectively. Data concerning the Cr-Fe system are from [Mas2, 1982Kub]. 

Fie] Field, R.D., Zindel, J.W., Fraser, H.L., The Intercellular Phase in R idly Solidified Alloys Based on the Al-Fe System , Scr. Metall, 20,415-418 (1986) (Crys. Stracture, Experimental, 8) [1987Die] Diehm, R.S., Mikkola, D.E., Effects of Mo and Ti Additions on the High Temperature Compressive Properties of Iron Aluminides Near FcsAl , Mater. Res. Soc. Symp. Proc. High-Temp. Ordered Intermetallic Alloys II, 81,329—334 (1991) (Experimental, Phase Relations, Meehan. Prop., 8)... 

Len] Lendvai, A., Phase Diagram of the Al-Fe System up to 45 mass% Iron , J. Mater. Sci. Lett, 5, 1219-1220 (1986) (Phase Diagram, Experimental, 7)... 

The Al-Fe system is accepted from [2006MSIT]. The Al-Ta system is accepted from flic thermodynamic modeling by [1996Du]. The Fe-Ta phase diagram is accepted from [1982Kub]. 

Figures 1 and 2 show the vertical sections atconstantAl content of 25 and 23 at.%, respectively [19980hn]. In addition to (aFe) + 2 phase field as in the case of Al-Fe system, the presence of ai + a.2 phase field in the ternary system may be seen in Figs. 1 and 2. As discussed by [19980hn], the topology of the phase boundaries involving ordered (ai, a2) and disordered phases (aFe) are consistent wifli the general features of phase diagrams associated with multicritical points [1982All].

Sto] Stone, L., Margolin, H., The Ti-V-Fe and Ti-Al-Fe Systems , U.S. Atomic Energy Commission Publication, AD-43730, 1-72 (1954) (Phase Diagram, Phase Relations, Experimental,, )... 

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