Complex Concentrated Alloys (CCAs)—Current Understanding and Future Opportunities

The research and development of high-entropy alloys (HEAs) and complex-concentrated alloys (CCAs) are growing rapidly, focusing on the enhanced properties of these alloys. However, so far, their manufacturing has not exceeded the laboratory scale. To meet this challenge, a combination of the processing characteristics and methods along with their sustainable production must be ensured. Moving towards a circular economy, this includes the utilization of low-cost, widely available scrap for the manufacturing of CCAs. Changing the raw materials, can ensure a cost-efficient production and paves the way to surpass major limitations in the industrial manufacturing of CCAs. Examples of a novel lightweight CCA design approach will be presented in this work.

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“…High mixing entropy derives from the high concentration of elements, which usually favors formation of simple solid-solution structures [24].…”

Section: Complex Concentrated Alloys: Types and Trendsmentioning

confidence: 99%

Development of Complex Concentrated Alloys (CCAs) Utilizing Scrap to Preserve Critical Raw Materials

Chaskis

Bouzouni²,

Gavalas³

et al. 2022

International Conference on Raw Materials and Circular Economy

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“…The high mixing entropy of CCAs generates the potential for solid-solution simplified microstructures. The multi-component nature of CCAs, the sluggish diffusion, and severe lattice distortions have a significant effect on their capability to maintain high mechanical properties at high temperatures [ 15 ].…”

Section: Complex Concentrated Alloy Families and Research Trendsmentioning

confidence: 99%

Complex Concentrated Alloys for Substitution of Critical Raw Materials in Applications for Extreme Conditions

Mitrică¹,

Badea²,

Serban³

et al. 2021

Materials

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The paper is proposing a mini-review on the capability of the new complex concentrated alloys (CCAs) to substitute or reduce the use of critical raw materials in applications for extreme conditions. Aspects regarding the regulations and expectations formulated by the European Union in the most recent reports on the critical raw materials were presented concisely. A general evaluation was performed on the CCAs concept and the research directions. The advantages of using critical metals for particular applications were presented to acknowledge the difficulty in the substitution of such elements with other materials. In order to establish the level of involvement of CCAs in the reduction of critical metal in extreme environment applications, a presentation was made of the previous achievements in the field and the potential for the reduction of critical metal content through the use of multi-component compositions.

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“…Among the main advantages of HEAs are the opening of a new era of complexity for more degrees of freedom, since there are many alloying systems that can be developed by focusing on the central region of the phase diagram, rather than near the corners (conventional alloys) [ 9 ]. HEAs show attractive characteristics regarding wear resistance, mechanical properties, and corrosion resistance (in the range of austenitic and ferritic stainless steels) [ 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

A review on wear, corrosion, and wear-corrosion synergy of high entropy alloys

Zirari,

Trabadelo

2024

Heliyon

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Complex Concentrated Alloys (CCAs)—Current Understanding and Future Opportunities

Abstract: Complex concentrated alloys with multiple principal elements represent a new paradigm in alloy design by focusing on the central region of a multi-component phase space and show a promising range of properties unachievable in conventional alloys [...]

Cited by 6 publications

References 13 publications

Development of Complex Concentrated Alloys (CCAs) Utilizing Scrap to Preserve Critical Raw Materials

Development of Complex Concentrated Alloys (CCAs) Utilizing Scrap to Preserve Critical Raw Materials

Complex Concentrated Alloys for Substitution of Critical Raw Materials in Applications for Extreme Conditions

A review on wear, corrosion, and wear-corrosion synergy of high entropy alloys

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