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Does high entropy alloy has potency to replace nickel-based superalloy? 

Melting point
Thermal expansion
Brazing
Thermal conductivity
Creep
Best insight from top research papers

High-entropy alloys (HEAs) show promise as potential replacements for nickel-based superalloys due to their unique properties. However, research indicates that refractory high-entropy alloys (RHEAs) may not yet be competitive with Ni-based superalloys in terms of tensile creep strength at elevated temperatures. Despite this, recent advancements highlight HEAs as potential alternatives for gas turbine applications, positioning them as promising materials for high-temperature use. HEAs, with their nearly equimolar multi-principal element compositions, exhibit exceptional thermal and mechanical properties under extreme conditions, offering a broader range of material properties compared to conventional alloys. While challenges exist, ongoing research aims to optimize non-equimolar HEAs by exploring substitutions to enhance performance and cost-effectiveness, indicating a potential for HEAs to eventually replace nickel-based superalloys in specific applications.

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Papers (5)Insight
Open access•Journal Article•DOI
Exploring the Compositional Space of High-Entropy Alloys for Cost-Effective High-Temperature Applications
Okan K. Orhan, Mewael Isiet, Lucas Caparini, Mauricio Ponga 
20 Jan 2022-Frontiers in Materials
5 Citations
High-entropy alloys show potential to replace nickel-based superalloys due to exceptional properties at high temperatures, offering cost-effective alternatives for high-temperature applications.
Journal Article•DOI
Development of high entropy alloys for brazing applications
Wolfgang Tillmann, T. Ulitzka, L. Wojarski, M. Manka, H. Ulitzka, D. Wagstyl 
01 Jan 2020-Welding in The World
14 Citations
High entropy alloys show potential to replace nickel-based superalloys due to unique properties like reduced brittle phases and specific crystal structures, as discussed in the research.
Open access•Book Chapter•DOI
Recent Advances of High Entropy Alloys: High Entropy Superalloys
Modupeola Dada, Patricia Popoola, Ntombizodwa R. Mathe, Samson Oluropo Adeosun, Sisa Pityana, Olufemi Aramide, N. Malatji, Thabo Lengopeng, Afolabi Ayodeji 
17 Mar 2021
3 Citations
Yes, High Entropy Superalloys (HESAs) are potential alternatives to nickel superalloys for gas turbine applications, presenting as promising materials due to their properties and advancements in manufacturing techniques.
Open access•Journal Article•DOI
Creep strength of refractory high-entropy alloy TiZrHfNbTa and comparison with Ni-base superalloy CMSX-4
Christian Gadelmeier, Ying Yang, Uwe Glatzel, Easo P. George 
01 Jul 2022-Cell reports physical science
4 Citations
High-entropy alloy TiZrHfNbTa shows lower creep strength compared to Ni-base superalloy CMSX-4, indicating limitations in replacing nickel-based superalloys for high-temperature applications.
Journal Article•DOI
Short review on high entropy alloys for high temperature structural applications
Ranjan Kumar Mishra
16 Jan 2023-Advances in Materials and Processing Technologies
Yes, high entropy alloys (HEAs) show promise to replace nickel-based superalloys due to their superior high-temperature properties, strength, and sluggish diffusion, as highlighted in the paper.

Related Questions

What industries are currently utilizing high entropy alloys and what are the potential future applications for this material?4 answersHigh entropy alloys (HEAs) are being utilized in various industries such as aerospace, transportation, energy, and oil & gas due to their exceptional properties. In the aerospace industry, HEAs show promise for cryogenic applications, while in the transportation sector, they offer lightweight alternatives to traditional materials like aluminum alloys. Additionally, the oil & gas industry is exploring HEAs for corrosion-resistant infrastructure. Future applications of HEAs include their use in energy storage systems, catalysis, and marine applications. The potential for HEAs lies in their ability to provide high strength, ductility, and corrosion resistance, making them attractive for a wide range of engineering applications with a focus on energy efficiency and environmental protection.
Why addition of cobalt in high entropy alloy justify?5 answersThe addition of cobalt in high entropy alloys (HEAs) is justified due to its significant impact on the mechanical properties and microstructure of the alloys. Cobalt addition in various HEA systems has been shown to induce phase transformations, increase ductility, improve strength-ductility products, enhance hardness, and promote the formation of new phases. Specifically, the addition of cobalt can lead to the transformation of phases from BCC to FCC, increase the volume fraction of FCC phases, and improve plasticity without compromising strength. Moreover, cobalt can contribute to the regulation of stacking fault energy, alter fracture modes, and enhance resistance to tribocorrosion. Overall, the addition of cobalt in HEAs is a strategic approach to tailor their properties for various applications.
How to obtain high entropy alloy?5 answersHigh entropy alloys (HEAs) can be obtained through various methods such as ball milling elemental powders for a specific duration to form the desired alloy composition. Another approach involves utilizing a step-alloying strategy to synthesize HEA nanoparticles with a wide range of elements, where the initial liquid phase reaction forms seed cores for subsequent thermal diffusion. Additionally, the preparation of HEAs can involve creating multi-component alloys with ordered structures, leading to unique properties like ferromagnetism. Furthermore, the synthesis of HEA nanoparticles can be achieved through solution approaches, allowing for the colocalization of multiple elements and tunable compositions by adjusting their ratios, ultimately expanding the compositional space of metal alloys. Overall, these diverse methods contribute to the broadening of the material library and the potential for tailored properties in high entropy alloys.
Can the high entropy alloys used as dental prothesis ?5 answersHigh entropy alloys (HEAs) have potential for use as dental prostheses due to their superior biocompatibility and mechanical properties. HEAs are alloys that contain five or more basic elements with concentrations of 5 to 35 at.% each. They have been found to exhibit high strength, wear resistance, heat resistance, structural stability, and resistance to corrosion and oxidation. The use of HEAs in dental prostheses could provide new solutions in the medical field, meeting future requirements for improved biocompatibility and mechanical properties. However, further research is needed to investigate the synthesis, microstructural analysis, and mechanical behavior of HEAs specifically for dental applications. Overall, HEAs show promise as potential materials for dental prostheses, but more studies are required to fully evaluate their suitability and performance in this application.
How can molecular dynamics be used for high entropy alloy research?5 answersMolecular dynamics (MD) simulations are used in high entropy alloy (HEA) research to investigate the mechanical properties and deformation behavior of these materials. MD simulations have been employed to study the deformation mechanisms and mechanical performance of equiatomic nano porous CoCrFeMnNi HEA. They have also been used to analyze the uniaxial tensile and compressive deformation behavior of FCC CoCrCuFeNi HEA, revealing orientation dependence and tension-compression asymmetry. Additionally, MD simulations have been combined with machine learning algorithms to predict the tensile properties of FeNiCrCoCu HEAs based on input parameters such as atomic concentrations, grain size, operating temperature, and strain rate. MD simulations have also been used to investigate the friction and wear properties of FeNiCrCoCu HEA, exploring the effects of cutting parameters and alloy concentration. Furthermore, MD simulations have been utilized to study the nanoindentation deformation behavior of single-crystal and nano-twinned FeCoCrNiCu HEA, revealing the role of twin boundaries in the plastic deformation process.
What are the potential applications of high entropy alloys in ballistics?5 answersHigh entropy alloys (HEAs) have potential applications in ballistics. Fe40Mn20Cr20Ni20 HEA demonstrated outstanding strain-hardening capabilities, making it a promising candidate for ballistic impact engineering compared to conventional steel. Additionally, the performance of complex concentrated alloys with varying microstructures was evaluated for ballistically impacting targets. The single-phase alloy with bimodal grain-size distribution exhibited superior ballistic performance compared to other HEAs, although none of these materials exceeded the performance of conventional rolled homogeneous armor steel. These findings suggest that HEAs have potential applications in ballistics, particularly in impact engineering and the development of high-performance concentrated alloys for ballistic applications through appropriate microstructural design.

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