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[en] Titanium aluminides containing 20--30 atom percent Al can suffer from severe subsurface embrittlement (alpha-case) when exposed to air at elevated temperatures for extended periods. For example, the alloys Ti-24Al-12.5Nb-1.5Mo and Ti-24Al-8Nb-2Mo-2Ta (based on the Ti3Al alpha-2 intermetallic compound) embrittle to a depth of about 80 microns during 1,000 hours exposures to air at 815 C (1,500 F), resulting in major reductions in tensile properties. Plasma-sprayed coatings of the MCrAlY and MCr types deposited over a thin diffusion barrier of chromium or tungsten, have been found effective in protecting these alloys against oxidation and embrittlement at this temperature
Source
Baker, I. (ed.) (Dartmouth Coll., Hanover, NH (United States). Thayer School of Engineering); Darolia, R. (ed.) (GE Aircraft Engines, Cincinnati, OH (United States)); Whittenberger, J.D. (ed.) (NASA, Cleveland, OH (United States). Lewis Research Center); Yoo, M.H. (ed.) (Oak Ridge National Lab., TN (United States)); 1233 p; ISBN 1-55899-183-2; 
; 1993; p. 953-958; Materials Research Society; Pittsburgh, PA (United States); 16. Materials Research Society (MRS) fall meeting; Boston, MA (United States); 30 Nov - 5 Dec 1992; Materials Research Society, 9800 McKnight Road, Pittsburgh, PA 15237 (United States)
; 1993; p. 953-958; Materials Research Society; Pittsburgh, PA (United States); 16. Materials Research Society (MRS) fall meeting; Boston, MA (United States); 30 Nov - 5 Dec 1992; Materials Research Society, 9800 McKnight Road, Pittsburgh, PA 15237 (United States)