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Accession Number
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ADA559099
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Title
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Oxidation Behavior of a Refractory NbCrMo0.5Ta0.5TiZr Alloy (Preprint).
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Publication Date
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Mar 2012
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Media Count
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41p
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Personal Author
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C. Woodward D. B. Miracle D. M. Dimiduk O. N. Senkov S. V. Senkova
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Abstract
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Isothermal oxidation behavior of a refractory high entropy NbCrMo0.5Ta0.5TiZr alloy was studied during heating at 1273 K for 100 hours 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 (SEM) accompanied by energy dispersive X-ray spectroscopy (EDS) 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.
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Keywords
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Bcc phases
Bcc(Body centered cubic)
Complex compounds
Cracking(Fracturing)
Entropy
Fcc phases
Fcc(Face centered cubic)
High entropy alloys
High temperature
Laves phases
Mechanical properties
Melting point
Microstructure
Oxidation
Oxidation kinetics
Oxidation reactions
Oxidation resistance
Oxide layers
Oxides
Phase compositions
Refractory alloys
Refractory metal alloys
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Source Agency
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Non Paid ADAS
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NTIS Subject Category
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71N - Nonferrous Metals & Alloys
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Corporate Author
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Air Force Research Lab., Wright-Patterson AFB., OH. Metals Branch.
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Document Type
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Technical report
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Title Note
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Technical paper.
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NTIS Issue Number
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1219
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Contract Number
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N/A
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