Environmental aluminides

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. 

One candidate is a titanium alioy that is reinforced with iarge diameter SiC/C filaments (see Chapter 4) and is fabricated by superplastic forming/ diffusion bonding. This MMC is suited to the fabrication of bladed compressor rings, shafts, ducks, fan components or structural rods for jet engines. Their use for parts submitted to still higher temperatures is limited by tiber/matrix reaction and environmental considerations. Titanium aluminide TisAI (or y-TiAl) matrices could permit an increase in the service temperature of the composites. 

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. 

Luu] Luu, W.C., Wu, J.K., Hydrogen Transport and Environmental Embrittlement Effects in Iron Aluminides , J. Mater. Sci., 35(16), 4121-4127 (2000) (Experimental, Transport Phenomena, Meehan. Prop., 24)... 

Leyens C, Braun R, Hovsepian P Eh and Miins W-D (2003), Environmental protection of gamma titanium aluminides . Gamma Titanium Aluminides2003, SaaDisgo,TMS. 

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