Surface oxidation mechanism of a refractory high-entropy alloy
Surface oxidation mechanism of a refractory. preferential oxidation in high entropy refractory materials could result in possible destabilization of the solid solution or formation of other
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Surface degradation mechanisms in a eutectic high entropy
Apr 12 2019 · Surface degradation mechanisms in a eutectic high entropy alloy at microstructural length-scales and correlation with phase-specific work function Y. et al. Oxidation behavior of high-entropy
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PROJECT DESCRIPTIONSARPA-E
strengthened refractory high entropy alloys (RHEAs) for additive manufacturing. The alloys will comprise a ductile (malleable) high entropy solid solution matrix strengthened by fine precipitates of the high entropy carbides. NETL will use high throughput multi-scale computer modeling and machine learning (ML) to identify
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Surface degradation mechanisms in a eutectic high entropy
Apr 12 2019 · Surface degradation mechanisms in a eutectic high entropy alloy at microstructural length-scales and correlation with phase-specific work function Y. et al. Oxidation behavior of high-entropy
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Oxidation Behavior between 700 and 1300 °C of Refractory
The oxidation resistance of any metallic material is enabled by the formation and maintenance of a stable continuous and adherent oxide scale on the surface such as Al 2 O 3 Cr 2 O 3 and SiO
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Entropy Free Full-Text High Temperature Oxidation and
The present work investigates the high temperature oxidation and corrosion behaviour of high entropy superalloys (HESA). A high content of various solutes in HESA leads to formation of complex oxides however the Cr and Al activities of HESA are sufficient to promote protective chromia or alumina formation on the surface.
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Oxidation Behavior between 700 and 1300 °C of Refractory
The oxidation resistance of any metallic material is enabled by the formation and maintenance of a stable continuous and adherent oxide scale on the surface such as Al 2 O 3 Cr 2 O 3 and SiO
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A. Oxidation behavior. Poor high-temperature oxidation resistance is a primary limitation of widespread implementation of commercial refractory alloys and requires them to be "prime-reliant" on environmental barrier coatings (if the coating fails the part fails).
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Activation Energy and High Temperature Oxidation Behavior
Jun 07 2017 · The oxidation behavior of a new high entropy alloy is investigated at different temperatures and compared with state-of-the-art materials. The properties of materials degrade at high temperature and the corrosion of structural components such as boilers gas turbines and tubes is a significant problem.
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High temperature oxidation behavior of NbZrTiTa high
High temperature oxidation behavior of NbZrTiTa high entropy alloy. In recent years a new design concept of high entropy alloy (HEA) has emerged which provides a new idea to solve the deficiency of traditional metal materials in comprehensive use.
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High-temperature oxidation behavior of FeCoCrNiAlx high
Nov 22 2019 · Excellent high-temperature oxidation resistance is one of many desirable properties of the High-entropy alloys (HEA) 1–6 .Therefore HEAs could be used in applications that require good high-temperature oxidation resistance such as nuclear power plant thermal power plant and vehicles engine 7–9 .Hence the fabrication of HEAs with desirable high-temperature oxidation property is
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Development of a Refractory High Entropy SuperalloyMDPI
Microstructure phase composition and mechanical properties of a refractory high entropy superalloy AlMo0.5NbTa0.5TiZr are reported in this work. The alloy consists of a nano-scale mixture of two phases produced by the decomposition from a high temperature body-centered cubic (BCC) phase. The first phase is present in the form of cuboidal-shaped nano-precipitates aligned in rows along lt
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Microstructure and wear behavior of a refractory high
Jun 01 2016 · The present work is part of a wide effort to assess refractory high entropy alloys at both ambient and high temperatures. The experimental effort described in this manuscript is an initial attempt to ascertain the sliding wear response of a refractory high entropy Mo 20 Ta 20 W 20 Nb 20 V 20 alloy at ambient temperatures which at the best of
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Oxidation Behavior between 700 and 1300 °C of Refractory
Jan 15 2018 · With an aim to improve the poor oxidation resistance of strong and ductile refractory TiZrNbHfTa high‐entropy alloys (HEAs) this study investigates the effect of Al additions on the oxidation behavior and mechanisms for Al 0‐1 TiZrNbHfTa HEAs. Higher Al content renders the alloy more resistant to oxidation.
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Frontiers in atomistic simulations of high entropy alloys
Oct 20 2020 · Osei-Agyemang and G. Balasubramanian " Surface oxidation mechanism of a refractory high-entropy alloy " NPJ Mater. Degrad. " Mechanical properties of Nb 25 Mo 25 Ta 25 W 25 and V 20 Nb 20 Mo 20 Ta 20 W 20 refractory high entropy alloys " Intermetallics 19 698
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PROJECT DESCRIPTIONSARPA-E
strengthened refractory high entropy alloys (RHEAs) for additive manufacturing. The alloys will comprise a ductile (malleable) high entropy solid solution matrix strengthened by fine precipitates of the high entropy carbides. NETL will use high throughput multi-scale computer modeling and machine learning (ML) to identify
Get Price
Development of a Refractory High Entropy SuperalloyMDPI
Microstructure phase composition and mechanical properties of a refractory high entropy superalloy AlMo0.5NbTa0.5TiZr are reported in this work. The alloy consists of a nano-scale mixture of two phases produced by the decomposition from a high temperature body-centered cubic (BCC) phase. The first phase is present in the form of cuboidal-shaped nano-precipitates aligned in rows along lt
Get PriceStatic and cyclic oxidation of Nb-Cr-V-W-Ta high entropy
Fig. 4 shows a parabolic oxidation in this high entropy alloy. Thus it would indicate that the oxidation involves a gradual process of oxide patch formation resulting in continuous decreasing oxidation rate until the metal surface is completely covered with the oxide/oxides.
Get PriceOxidation behavior of a refractory NbCrMo 0.5 Ta 0.5 TiZr
Jun 06 2012 · 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
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Tuning Ductility for Refractory High-Entropy Alloys
Refractory High Entropy Alloys (Wu et al. Mater Lett 2014) Hf 25 Nb 25 Ti 25 Zr 25 the first refractory HEAs reporting tensile ductility Hf 20 Nb 20 Ti 20 Zr 20 Ta 20 it shows an impressive compressive ductility and higher strength compared to Hf 25 Nb 25 Ti 25 Zr 25 tensile ductility has also been confirmed (Senkov et al. JAC 2011) (Dirras
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Surface oxidation mechanism of a refractory high-entropy
May 09 2019 · Surface oxidation mechanism of a refractory high-entropy alloy Abstract. High-entropy alloys (HEAs) synthesized using refractory elements are being strongly considered as candidates Introduction. High-entropy alloys (HEAs) a subset of multi-principal element alloys (MPEAs) contain N
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Oxidation Behavior of Refractory AlNbTiVZr0.25 High
The presented results showed that the oxidation behavior of the AlNbTiVZr 0.25 refractory high-entropy alloy strongly depends on temperature and time. Particularly at 600–700 °C the alloy demonstrated a mixed parabolic-linear rate of the mass gain per unit surface area.
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High-Temperature Oxidation Behavior of Refractory High
Jan 05 2017 · 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
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Surface degradation mechanisms in precipitation-hardened
Oct 02 2018 · Surface degradation mechanisms in precipitation-hardened high-entropy alloys resistance to irradiation damage 5 6 and surface oxidation. 7 8 9 In addition and wear behavior of a
Get PriceAlloying effect on the oxidation behavior of a ductile Al0
Refractory high-entropy alloys (RHEAs) 1e3 consisting of re-fractory metals with high melting points constitute one particular group of high-entropy alloys (HEAs) 4e6 . Ever since their first emergence RHEAs have been regarded as potential next-generation high
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Frontiers in atomistic simulations of high entropy alloys
Oct 20 2020 · Osei-Agyemang and G. Balasubramanian " Surface oxidation mechanism of a refractory high-entropy alloy " NPJ Mater. Degrad. " Mechanical properties of Nb 25 Mo 25 Ta 25 W 25 and V 20 Nb 20 Mo 20 Ta 20 W 20 refractory high entropy alloys " Intermetallics 19 698
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Development and exploration of refractory high entropy
Oct 01 2018 · Open literature publications in the period from 2010 to the end of January 2018 on refractory high entropy alloys (RHEAs) and refractory complex concentrated alloys (RCCAs) are reviewed. While RHEAs by original definition are alloys consisting of five or more principal elements with the concentration of each of these elements between 5 and 35 at. RCCAs can contain three or
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High Entropy Alloy Coatings and Technology
area 31 32 (1) Metallic HEAs (2) ceramic HEAs (or high entropy ceramics) and (3) high entropy composites. The metallic HEA coatings include initially developed Cantor-based HEAs and their derivatives with other lightweight HEA based on Al Mg Si etc structural elements. Refractory alloys are also included in metallic HEAs.
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High-Temperature Oxidation Behavior of Refractory High
Jan 05 2017 · 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
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