Thermal Stability of Medium- and High-Entropy Alloys of 3d-Transition Metals

Fourmont, A.; Рогачев, А. С.; Gallet, S. Le; Politano, O.; Kovalev, D. Yu.; Кочетов, Н. А.; Шкодич, Н. Ф.; Вадченко, С. Г.; Baras, F.

doi:10.1007/s11669-021-00903-y

Cited by 8 publications

(3 citation statements)

References 43 publications

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“…HEA systems, such as Al-Co-Cr-Cu-Fe-Ni, Co-Cr-Cu-Fe-Ni-Ti, Al-Co-Cr-Cu-Fe-Ni-B, Al-Co-C, and Al-Co-Cr-Cu-Fe-Ni-V offer excellent characteristics such as high hardness and strength, excellent wear resistance, high-temperature strength, good structural stability, limited diffusion, oxidation resistance over conventional alloys since [17] first discovered them. Afterwards, HEAs became an essential topic in material science.…”

Section: Introductionmentioning

confidence: 99%

High-Entropy Alloys: Advantages and Applications in Challenging Environments

Al-Ubaidy,

Bouraoui

2024

ACSM

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Modern mechanical applications demand robust materials with boosted mechanical properties capable of resisting challenging working conditions. Single substances and pure material might fail to meet all application requirements translated by larger robustness and endurance. Correspondingly, scholars developed functional substances recognized with high-energy alloys (HEAs) with upgraded strength, durability, and corrosion behavior. Nonetheless, the available literature requires further research that provides sufficient insights pertaining to HEAs' contributions. Consequently, this research is guided, aiming to bridge this knowledge gap by exploring the contributory merits and valuable benefits of HEAs when engaged in challenging operating circumstances. The article addresses the promising HEA gains, their leading features, relevant properties, and diversified applications. The method adopted in this work comprises a scoping review through which multiple peer-reviewed articles and recent publications (2003 to 2023) were surveyed, addressing contributory gains of HEAs in fulfilling enhanced mechanical performance for different applications. Based on the scoping overview led in this paper, it was found that HEAs could serve in multiple engineering areas under challenging working conditions owing to their practical properties, namely elevated hardness, augmented mechanical strength, amended fatigue resistance, elaborated ductility, optimal toughness, superior microstructure stability at high temperatures, and exceptional wear resistance, considerable corrosion resistance, and boosted oxidation resilience. Accordingly, these excellent characteristics enable their broad implementation in vital engineering disciplines and arduous practices, notably aviation, automotive, maritime, energy storage systems (ESSs), and additive manufacturing. Additionally, the review outcomes revealed that mixing multiple elements together with numerous crystal structures could provide significant strength-toweight ratios, helping exhibit various potent features compared with traditional alloys. In light of this framework, the implications of this research are mirrored by focusing more attention on the consequential engineering influences and feasible practicalities of HEAs to promote their extensive utilization in multiple domains, allowing supportive qualities and advantageous effects on entire material characteristics to each application they are engaged in. From this perspective, it is suggested to manage additional research processes to classify vital gains of HEAs and elucidate their added value.

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Section: Introductionmentioning

confidence: 99%

High-Entropy Alloys: Advantages and Applications in Challenging Environments

Al-Ubaidy,

Bouraoui

2024

ACSM

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“…Al-Co-Cr-Fe-Ni is one of the most popular systems based on which numerous high-entropy materials (HEM) have been created [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ]. The initial studies were aimed at obtaining alloys with maximum configurational entropy with multiple principal elements in equimolar or near-equimolar ratios.…”

Section: Introductionmentioning

confidence: 99%

“…Most HEAs are obtained by different melting technics [ 2 , 3 , 5 , 8 , 10 , 11 , 12 ] or mechanical alloying [ 4 , 6 , 7 , 9 , 20 , 21 ]. These methods allow destroying the crystalline structure of the starting materials and effectively mix the components.…”

Section: Introductionmentioning

confidence: 99%

Combustion Synthesis and Reactive Spark Plasma Sintering of Non-Equiatomic CoAl-Based High Entropy Intermetallics

et al. 2023

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The present work reports the direct production of a high-entropy (HE) intermetallic CoNi0.3Fe0.3Cr0.15Al material with a B2 structure from mechanically activated elemental powder mixtures. Fast and efficient combustion synthesis (CS), spark plasma sintering (SPS), and reactive SPS (RSPS) methods were used to synthesize the HE powders and bulks. The formation of the main B2 phase along with some amounts of secondary BCC and FCC phases are reported, and L12 intermetallic (CS scheme) and BCC based on Cr (CS + SPS and RSPS schemes at 1000 °C) were observed in all samples. The interaction between the components during heating to 1600 °C of the mechanically activated mixtures and CS powders has been studied. It has been shown that the formation of the CoNi0.3Fe0.3Cr0.15Al phase occurs at 1370 °C through the formation of intermediate intermetallic phases (Al9Me2, AlCo, AlNi3) and their solid solutions, which coincidences well with thermodynamic calculations and solubility diagrams. Compression tests at room and elevated temperatures showed that the alloy obtained by the RSPS method has enhanced mechanical properties (σp = 2.79 GPa, σ0.2 = 1.82 GPa, ε = 11.5% at 400 °C) that surpass many known alloys in this system. High mechanical properties at elevated temperatures are provided by the B2 ordered phase due to the presence of impurity atoms and defects in the lattice.

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