Oxidation behavior of a refractory NbCrMo0.5Ta0.5TiZr alloy

Isothermal oxidation behavior of a refractory high-entropy NbCrMo 0.5 Ta 0.5 TiZr 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 depen...

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Bibliographic Details
Published in:Journal of materials science 2012-09, Vol.47 (18), p.6522-6534
Main Authors: Senkov, O. N., Senkova, S. V., Dimiduk, D. M., Woodward, C., Miracle, D. B.
Format: Article
Language:English
Subjects:
Alloy development
Alloying elements
Alloys
Aluminum
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crystallography and Scattering Methods
Energy dispersive X ray spectroscopy
Gain
Materials Science
Mechanical properties
Molybdenum
Niobium base alloys
Oxidation
Oxidation resistance
Oxides
Polymer Sciences
Refractories
Refractory materials
Scale (corrosion)
Scanning electron microscopy
Silicon
Solid Mechanics
Time dependence
Titanium
Weight
X-rays
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Summary:Isothermal oxidation behavior of a refractory high-entropy NbCrMo 0.5 Ta 0.5 TiZr 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.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-012-6582-0