Iron aluminides, intermetallics

Mor] Morris, D.G., Munoz-Morris, M.A., Chao, J., Development of High Slrengfli, High Ductility and High Creep Resistant Iron Aluminide , Intermetallics, 12(7-9), 821-826 (2004) (Interface Phenomena, Meehan. Prop., Morphology, Phase Relations, Review, 52)... 

The present monograph was first written as a chapter for Volume 8 of the series Materials Sdence and Technology A Comprehensive Treatment , edited by Robert W. Cahn, Peter Haasen, and Edward J. Kramer (Volume Editor Dr. Karl Heinz Matucha). Its aim is to give an overview of intermetallics, which is both detailed and comprehensive and which includes the fundamentals as well as applications. The result is an extended, critical review of the whole field of intermetallics with an emphasis on those intermetallic phases which have already been applied as functional or structural materials or which are currently the subject of materials developments. A historical introduction and a discussion of the relationship between atomic bonding, crystal structure, phase stability and properties is followed by a discussion of the major classes of intermetallics. The titanium aluminides, nickel aluminides, iron aluminides, copper phases, A15 phases. Laves phases, beryllides, rare earth phases, and siliddes are reviewed. In particular, the crystal structures, phase diagrams, and physical properties as well as the mechanical and corrosion behavior are treated. The state of developments as well as prospects and problems are discussed in view of present and future applications. The publisher has decided to publish the review as a separate monograph in order to make it accessible to a wider audience. 

Many of the intermetallic compounds are very difficult to process into thin sheets because they exhibit very low ductility at ambient temperatures. Powder metallurgical techniques coupled with tape casting have been employed to process these materials into continuous thin sheets which, after removal of the polymer binder and plasticizer, can be sintered and rolled to full density with a sequence of cold work and annealing steps. The use of tape casting has recently been reported for the production of iron aluminide (FeAl) thin sheets with excellent properties. We believe that this processing technology can be used for other intermetallic compounds, especially for the production of continuous thin sheets. 

Given that Fe-Al intermetallics were among the earliest intermetallics investigated, a historical perspective of Fe-Al alloy development will be presented. This is followed by a discussion of the oxidation behavior of Fe3Al and FeAl in air. Because of interest in their use in complex, corrosive environments, a detailed discussion of the oxidation behavior of iron aluminides in intermediate temperature (<800°C) environments containing species such as sulfur, chlorine, and carbon will also be presented. 

Johnson, D. R., Oliver, B. F., Noebe, R. D., Whitten-beiger, J. D. (1995), Intermetallics 3,493-503. June, M., Sawyer, J. (1998), Iron Aluminide Hot Gas Filter Development arui Testing, to be published in Proc. Advanced Coal-Based Power and Environmental Systems, US Department of Energy. 

Intermetallic hardening alloys, for example, nickel-base superalloys, austenitic stainless steels, and iron-aluminides... 

Sikl] Sikka, V.K., Baldwin, R.H., Reinshagen, J.H, Knibloe, J.R., Wright, R.N., Powder Processing of Fe3Al-Based Iron-Aluminide Alloys , Mater. Res. Soc. Symp. Proc. High-Temp. Ordered Intermetallic Alloys IV, 213, 901-906 (1991) (Ciys. Structure, Experimental, Phys. Prop., 4)... 

Intermetallic compounds titanium aluminides [55-60], nickel aluminides [61-64], iron aluminides [65-68] and molybdenum silicides [69,70]. 

Paramount information on structure and phase equilibria of the ThMni2 type compounds was collected by Gladyshevsky et al. (1990), while the structure and magnetic properties have been reviewed several times for rare-earth aluminides (Nowik and Felner 1983), rare-earth and actinide aluminides (Suski 1985), actinide aluminides (Sechovsky and Havela 1988), intermetallics with higher content of the iron-group metals for the rare eardis (Buschow 1991, H.-S. Li and Coey 1991), and uranium (Suski 1992). 

---