Oxidation behavior of a refractory NbCrMo0.5Ta0.5TiZr alloy
- 1.3k Downloads
Isothermal oxidation behavior of a refractory high-entropy NbCrMo0.5Ta0.5TiZr alloy was studied during heating at 1273 K for 100 h in flowing air. Continuous weight gain occurred during oxidation, and the time dependence of the weight gain per unit surface area was described by a parabolic dependence with the time exponent n = 0.6. X-ray diffraction and scanning electron microscopy accompanied by energy-dispersive X-ray spectroscopy showed that the continuous oxide scale was made of complex oxides and only local (on the submicron levels) redistribution of the alloying elements occurred during oxidation. The alloy has a better combination of mechanical properties and oxidation resistance than commercial Nb alloys and earlier reported developmental Nb–Si–Al–Ti and Nb–Si–Mo alloys.
KeywordsOxide Layer Oxide Scale Lave Phase BCC1 Phase Unit Surface Area
Technical support from Drs. Carmen Carney and Fred Meisenkothen is greatly appreciated. This work was supported through the Air Force Research Laboratory Director’s Fund and through USAF contract No. FA8650-10-5226.
- 2.MacKay RA, Gabb TP, Smialek JL, Nathal MV (2009) Alloy design challenge: development of low density superalloys for turbine blade applications, NASA/TM—2009-215819Google Scholar
- 3.Subramanian PR, Mendiratta MG, Dimiduk DM, Stucke MA (1997) Mater Sci Eng A2390240:1–13Google Scholar
- 9.Senkov ON, Scott JM, Senkova SV, Miracle DB, Woodward CF (2010) J Mater Sci. doi: 10.1007/s10853-012-6260-2
- 16.Subramanian PR, Mendiratta MG, Dimiduk DM, Stuke MA (1997) Mater Sci Eng A239–240:1–13Google Scholar
- 17.Birks N, Meier GH (1983) Introduction to high temperature oxidation of metals. Edward Arnold (Publishers) Ltd, LondonGoogle Scholar
- 18.Kubaschewski O, Hopkins BE (1962) Oxidation of metals and alloys, 2nd edn. Butterworth and Co. Ltd, LondonGoogle Scholar
- 19.West JM (1980) Basic corrosion and oxidation. Ellis Horwood Limited, Chichester, 1980Google Scholar
- 20.Bernstein HL (1987) Metall Trans A 18A:975–985Google Scholar
- 21.Harwood JJ (1956) Materials and Methods 44(6):84–89Google Scholar
- 27.Menon ESK, Mendiratta MG, Demiduk DM (2001) In: Hemker KJ, Dimiduk DM, Clemens H, Darolia R, Inui H, Larsen JM, Sikka VK, Thomas M, Whittenberger JD (eds) Structural Intermetallics TMS, Materials Park, pp 591–600Google Scholar