Related references
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Article
Chemistry, Physical
Ahmad Ostovari Moghaddam et al.
Summary: This study compared the oxidation behavior of tungsten-containing high entropy alloys (HEAs) with medium entropy alloy (MEA) at high temperatures, and found that the oxidation resistance of tungsten-containing HEAs was poor. However, the W-Mo-Ta-Al-Cr HEA exhibited the best oxidation resistance among all the tungsten-containing alloys.
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(2022)
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Summary: WMoTaNbTi RHEAs formed by SEBM with negative defocus distance were studied. The results show that the decrease in scanning speed leads to vaporization of Nb and Ti elements, weakening the solid-solute strengthening and reducing the content of Nb and Ti solutes in the matrix, resulting in improved ductility and decreased microhardness. The as-deposited WMoTaNbTi RHEA formed at a scanning speed of 2.5 m/s exhibits high ultimate strength.
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Li-Chao Li et al.
Summary: Recent research shows that the excellent oxidation resistance of MoTaTiCr alloy is mainly associated with the formation of a continuous CrTaO(4) oxide layer, suggesting that complex oxides can be effective candidates for enhancing the oxidation resistance of high-entropy alloys.
SCIENCE CHINA-MATERIALS
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Review
Chemistry, Physical
Tao Fu et al.
Summary: Tungsten, as the most prominent plasma-oriented material in nuclear fusion reactors, suffers from poor oxidation resistance at high temperatures. Scholars have suggested that self-passivating tungsten alloy and surface protection technology are effective ways to address this issue. Studies on various alloys and coatings for oxidation protection of tungsten have been reviewed, with analysis on their microstructure, oxidation behavior, and failure mechanism. Future development direction and trend in oxidation protection of W-based materials are also discussed.
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Guoqiang Luo et al.
Summary: A novel RHEA matrix MoNbW(TaC)0.9 composite with ultra-high compressive strength of 2.19 GPa at 1200 degrees C has been identified, showing great application prospects in the aerospace field. The composite has a eutectic-like microstructure composed of BCC phase and fine lamellar eutectoid structures.
Article
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Ahmad Ostovari Moghaddam et al.
Summary: High-entropy alloys (HEAs) offer a wide range of chemical compositions for designing novel materials suitable for high temperature oxidation applications in harsh environments. This study conducted theoretical and experimental analysis on the oxidation behavior of Al0.25CoCrFeNiMn and Al0.45CoCrFeNiSi0.45 HEAs in a temperature range of 700-1000 degrees C for 10 hours in air atmosphere. The superior high-temperature oxidation resistance of Al0.45CoCrFeNiSi0.45 HEA was attributed to the formation of a protective Al2O3-SiO2 rich oxide layer on the alloy's surface, while Al0.25CoCrFeNiMn HEA showed less protection due to the formation of a noncompact oxide layer containing transition elements. The study also found a significant correlation between thermodynamic calculations and experimental analysis of oxidation behavior.
Article
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Review
Chemistry, Physical
Sergey Veselkov et al.
Summary: In recent years, interest in high-entropic alloys has been growing, but few review articles have presented results accumulated over several years, making it difficult to choose directions for further research. This review provides insights into the mechanisms of high-temperature oxidation of HEAs, offering new directions for the development of heat-resistant alloys.
Article
Materials Science, Multidisciplinary
Jing Wen et al.
Summary: The addition of aluminum in refractory high entropy alloys can lead to complex precipitation behaviors, affecting the mechanical properties of the alloys. The study found that the type of precipitates formed in Al-contained RHEAs varies with the aluminum content, with different phases forming at different levels of aluminum.
Article
Materials Science, Multidisciplinary
S. Schellert et al.
Summary: The oxidation resistance of alloys Ta-x-(Mo-Cr-Ti-Al)(1-x) in air at 1200 degrees C is improved with increasing Ta concentration. However, alloys with Ta concentrations less than or equal to 10 at% exhibit poor oxidation behavior. Protective CrTaO4 scales are found in alloys containing 15 and 20 at% Ta.
Article
Materials Science, Multidisciplinary
Ahmad Ostovari Moghaddam et al.
Summary: Researchers have designed and fabricated four previously unexplored body-centered cubic single phase alloys using a simple thermodynamic approach, with the effectiveness further demonstrated by theoretical simulations and experimental synthesis. Elemental segregation was successfully predicted and high microhardness values were observed in all samples, leading to a proposed general route for designing medium- to high-entropy alloys.
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Materials Science, Multidisciplinary
Gengbiao Chen et al.
Summary: The study found that adding an appropriate amount of Zr element can increase the strength and hardness of TiMoNbZrx alloys, with TiMoNbZr0.5 exhibiting the best wear resistance performance.
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