Aluminides advanced

These phases are of general interest with respect to alloying Ni-base alloys since Mo is an important alloying element for superalloys. Corresponding multinary phase diagrams have been studied experimentally and theoretically (see, e.g.. Brooks et al., 1984 Chakravorty and West, 1986 Ko-dentzov et al., 1988 Enomoto et al., 1991), in particular with respect to equilibria with the aluminide NijAl which forms the basis of the advanced aluminides (see Sec. 4.1). 

Reinforcement for metal-matrix composites with such metals as titanium, titanium aluminide, aluminum, magnesium, and copper. Applications are found mostly in advanced aerospace programs and include fan blades, drive shafts, and other components. 

Clement. T.P., Parsonage, T,Band M.B, Kuxhaus Ti2AlNb = Based. Alloys Outperform Conventional Titanium Aluminides, Advanced Materials < Processes, 37 (March 1992). 

Jha, S.C., et al. Titanium-Aluminide Foils, Advanced Materials Processes, 87 (April 1991). 

P. R. Subramanian, M. G. Mendiratta, D. M. Dimiduk and M. A. Stucke, Advanced intermetallic alloys - beyond gamma titanium aluminides Mat. Sci. Engg., A239-240 (1997) 1-13. 

Gao, M., Boodey, J. B., and Wei, R. P., Misfit Strains and Mechanism for the Precipitation of Hydrides in Thermally Charged Alpha-2 Titanium Aluminides, in Environmental Effects on Advanced Materials, R. H. Jones and R. E. Ricker, eds., The Minerals, Metals and Materials Society, Warrendale, PA (1991), 47-55. 

R. A. Perkins, G. H. Meier. Oxidation Resistant Aluminides for Metal Matrix Composites , in Advanced Materials Conference II, FW. Smith ed.. Advanced Materials Institute, 1989. p. 92. 

New structural intermetallic alloys for high-temperature applications are at the center of the present interest in intermetallics, which is still growing. A few developments, which are based on the classic phases NijAl, TijAl and TiAl, and which are known as the nickel aluminides and the titanium aluminides, are on the brink of commercialization, but even these developments are still at an early stage compared with other developments of advanced materials, e.g. the modern engineering ceramics. Much more experimental and theoretical work is necessary to solve the processing problems and to ad-... 

The much advanced nickel aluminides and titanium aluminides can be used only up to about 1000 °C because of their limited strength or oxidation resistance or both at higher temperatures, as has been stated before (Sauthoff, 1994). For applications significantly above 1000 °C other less-com--mon phases with higher melting temperatures have to be used. Such phases are available, and examples are shown in Fig. 34 (Sauthoff, 1992). In comparison to the nickel aluminides and titanium alu-... 

When microsecond pulse-heating became popular, the main interest was in liquid refractory metals such as Nb, Mo, Re, Ta, and W. As pyrometry advanced over time and technological interests changed, the focus shifted more and more towards lower-melting metals and alloys, such as noble metals [20] or titanium-aluminides [21,22]. 

Metal-Ceramic Composites. Metals such as aluminum, titanium, copper and the intermetallic titanium aluminide, which are reinforced with silicon-carbide fibers or whiskers show an appreciable increase in mechanical properties particularly at elevated temperatures. These composites are being considered for advanced aerospace structures.1 1... 

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. 

The traditional fabrication methods for the alu-minide fuels are fairly simple. The fuel fabrication waste volumes can be minimized. Several variations of the fabrication method of the aluminide fuel form have been successfully applied to produce Pu-Al composite fuel elements. Plutonium fabrication facilities currently exist at the Los Alamos National Laboratory and the Savannah River Site. These facilities could be used to produce Pu-Al composite fuel elements in sufficient quantities to verify fuel designs and prove the fuel performance. The Advanced Test Reactor at the INEL could be used to test these fuels. 

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