High-Temperature Oxidation Behavior of Refractory High-Entropy Alloys: Effect of Alloy Composition

The high-temperature oxidation behavior of a new family of refractory high-entropy alloys (HEAs) with compositions of W–Mo–Cr–Ti–Al, Nb–Mo–Cr–Ti–Al and Ta–Mo–Cr–Ti–Al was studied at 1000 and 1100 °C. Based on these equimolar starting compositions, the main incentive of this study was to select the m...

Full description

Saved in:
Bibliographic Details
Published inHigh temperature corrosion of materials Vol. 88; no. 3-4; pp. 339 - 349
Main Authors Gorr, Bronislava, Müller, Franz, Azim, Maria, Christ, Hans-Jürgen, Müller, Torsten, Chen, Hans, Kauffmann, Alexander, Heilmaier, Martin
Format Journal Article
LanguageEnglish
Published New York Springer US 01.10.2017
Springer Nature B.V
Subjects
Alloy systems
Alloys
Aluminum
Chemistry and Materials Science
Chromium base alloys
Composition effects
Corrosion and Coatings
High entropy alloys
Inorganic Chemistry
Materials Science
Metallic Materials
Molybdenum base alloys
Niobium
Original Paper
Oxidation
Oxidation resistance
Reaction kinetics
Refractory alloys
Scale (corrosion)
Tantalum base alloys
Titanium base alloys
Tribology
Tungsten
High-entropy alloys
Oxide evaporation
Oxidation kinetics
Refractory metals
Oxide scale morphology
Online AccessGet full text

Cover

More Information
Summary:The high-temperature oxidation behavior of a new family of refractory high-entropy alloys (HEAs) with compositions of W–Mo–Cr–Ti–Al, Nb–Mo–Cr–Ti–Al and Ta–Mo–Cr–Ti–Al was studied at 1000 and 1100 °C. Based on these equimolar starting compositions, the main incentive of this study was to select the most promising alloy system whose properties may then be successively improved. Despite the high amount of refractory elements, Ta–Mo–Cr–Ti–Al showed good oxidation resistance at 1000 and 1100 °C. Moderate values of mass gain and complex oxidation kinetics were observed for the W- and Nb-containing HEAs. These alloys formed inhomogeneous oxide scales possessing regions with thick and porous layers as well as areas revealing quite thin oxide scales due to the formation of discontinuous Cr- and Al-rich scales. The most promising behavior was shown by the alloy Ta–Mo–Cr–Ti–Al which followed the parabolic rate law for oxide growth due to the formation of a thin and compact Al-rich layer.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:0030-770X
2731-8397
1573-4889
2731-8400
DOI:10.1007/s11085-016-9696-y