4.6 Review

Review on Preparation Technology and Properties of Refractory High Entropy Alloys

Related references

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Article Materials Science, Multidisciplinary

Effect of Ti Addition on the Microstructure and High-Temperature Oxidation Property of AlCoCrFeNi High-Entropy Alloy

Gi-Su Ham et al.

Summary: The study found that the addition of Ti significantly improved the high-temperature oxidation resistance of AlCoCrFeNi high-entropy alloy, with Ti1.0 alloy showing superior performance at 1100 degrees Celsius compared to other major alloys. Observation after oxidation tests revealed that Ti1.0 alloy had localized Al2O3 spallation, accelerated BCC -> FCC phase transformation, and formation of an FCC phase layer with decreased thickness.

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Microstructure characteristics and mechanical properties of Hf0.5Mo0.5NbTiZr refractory high entropy alloy with Cr addition

X. J. Gao et al.

Summary: This paper investigates the effects of Cr addition on the microstructure, phase constitutes, and mechanical properties of the Hf0.5Mo0.5NbTiZr refractory high-entropy alloy. The addition of Cr refines the dendritic structure, increases the strength, and influences the plasticity of the alloy. Homogenization treatment promotes the formation of Laves phase and significantly enhances the strength of the alloy.

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Article Materials Science, Multidisciplinary

Lightweight refractory high entropy alloy coating by laser cladding on Ti-6Al-4V surface

Lin Chen et al.

Summary: The AlTiVMoNb lightweight refractory high-entropy alloy (RHEA) coating was successfully deposited on the TC4 substrate by laser cladding, improving its surface hardness and high-temperature oxidation resistance. The coating structure, containing a single BCC HEA phase, demonstrated significantly higher microhardness compared to the TC4 substrate. Additionally, the complex mixed oxides in the coating contributed to its continuous oxidation resistance at high temperatures.

VACUUM (2021)

Article Nanoscience & Nanotechnology

Designing VxNbMoTa refractory high-entropy alloys with improved properties for high-temperature applications

M. Wang et al.

Summary: The novel VxNbMoTa high-entropy alloys with vanadium concentrations of 0-25 at.% exhibit exceptional phase stability and high temperature strength, as well as excellent room-temperature ductility and resistance to high temperature deformation.

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Article Materials Science, Multidisciplinary

Effect of Ta and Ti content on high temperature elasticity of HfNbZrTa1-xTix refractory high-entropy alloys

Lin Shao et al.

Summary: The study investigated the finite temperature elastic properties of non-equiatomic refractory high-entropy alloys and emphasized the effect of Ta and Ti addition. The addition of Ta and Ti can improve ductility while affecting strength and hardness differently. By tuning the Ti/Ta ratio, a proper trade-off between strength and ductility can be achieved for the high temperature mechanical properties of the alloy.

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Microstructure and properties of TiNbZrMo high entropy alloy coating

Yueming Huang et al.

Summary: The novel refractory high-entropy alloys coating (RHEC) synthesized on 316L by laser cladding, with composition close to TiNbZrMo, exhibits high hardness and excellent wear resistance. It also shows superior corrosion resistance compared to 316L stainless steel, with an average microhardness about twice that of the substrate.

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Effects of vanadium concentration on mechanical properties of VxNbMoTa refractory high-entropy alloys

M. Wang et al.

Summary: For refractory high-entropy alloys VxNbMoTa, increasing the V concentration can lead to improved yield strength and ductility at room temperature. The fracture morphologies of VxNbMoTa also change with increasing V content, transitioning from intergranular to transgranular. Additionally, high vanadium alloys show better ductility due to refined grains and reduced impurities and brittle compounds at the grain boundary, as revealed by atom probe tomography.

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Influence of V and Heat Treatment on Characteristics of WMoNbTaV Refractory High-Entropy Alloy Coatings by Mechanical Alloying

Chun-Liang Chen et al.

Summary: Refractory high-entropy alloy coatings were prepared on 304 stainless steel substrates via mechanical alloying, with the presence of V element promoting alloying efficiency and hardness. Annealing treatment improved microstructure homogeneity but also caused the formation of Ta-rich oxides.

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Effect of Ti and Nb Contents on Microstructure and Mechanical Properties of HfZrVTaMoWTixNby Refractory High-Entropy Alloys

Hongwei Yao et al.

Summary: The effects of Ti and Nb contents on the phase equilibrium and mechanical properties of HfZrVTaMoWTixNby RHEAs were studied to achieve balanced properties in a wide temperature range. Increasing Ti or Nb content suppresses Laves phase precipitation, improves room temperature malleability, and enhances high-temperature performance.

ADVANCED ENGINEERING MATERIALS (2021)

Article Chemistry, Physical

Al0.3CrxFeCoNi high-entropy alloys with high corrosion resistance and good mechanical properties

Xiaolei Yan et al.

Summary: The study demonstrates that increasing the Cr content in Al-Cr-Fe-Co-Ni high-entropy alloys can improve the corrosion resistance and mechanical properties of the alloys. With the increase in Cr content, both the pitting resistance and strength of the alloys are enhanced.

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Article Chemistry, Physical

Development of Precipitation-Strengthened Al0.8NbTiVM (M = Co, Ni) Light-Weight Refractory High-Entropy Alloys

Kangjin Lee et al.

Summary: Single-phase solid-solution refractory high-entropy alloys have attracted attention for their excellent mechanical properties and phase stability at elevated temperatures. By adding Ni or Co to Al0.8NbTiV HEA, precipitation-hardened lightweight RHEAs with homogeneous distribution of sigma precipitates were successfully developed, showing superior specific yield strength compared to other RHEA alloys and a conventional Ni-based superalloy at high temperatures.

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Recent advances on environmental corrosion behavior and mechanism of high-entropy alloys

Yu Fu et al.

Summary: High-entropy alloys (HEAs) have emerged as a research hotspot in the field of metal materials in the past decade. They exhibit much better corrosion resistance than traditional corrosion-resistant metal materials and the correlation among composition, microstructure, and corrosion resistance of HEAs has been revealed. The influence of heat treatment, anodizing treatment, and preparation methods on the corrosion behavior of HEAs has also been elaborated.

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Summary: The study found that the high temperature oxidation of Al-containing refractory high entropy alloys (RHEAs) is significantly influenced by the Al content. Lower Al concentrations are affected by the formation of other oxidation products, while higher Al concentrations result in relatively thin oxide scales and internal corrosion zones. Low Al concentrations lead to thick and porous oxide scales.

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Effect of Al addition on the microstructure, mechanical and wear properties of TiZrNbHf refractory high entropy alloys

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Summary: A series of AlxTiZrNbHf refractory high entropy alloys (RHEAs) were prepared to investigate their mechanical and wear properties. It was found that the addition of Al improved the mechanical and wear resistance properties by causing lattice distortion and second phase strengthening in the alloys. The study highlighted significant alterations in microstructure, mechanical properties, and wear resistance with the inclusion of Al, which is beneficial for designing alloys for wear applications.

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Outstanding radiation resistance of tungsten-based high-entropy alloys

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