Preternatural Hexagonal High-Entropy Alloys: A Review

Li, Ruixuan; Qiao, J.W.; Liaw, Peter K.; Zhang, Yong

doi:10.1007/s40195-020-01045-9

Cited by 41 publications

(21 citation statements)

References 72 publications

(78 reference statements)

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“…As a novel high-strength and toughness multi-component alloy material, its inherent high-entropy effect [17,18] can inhibit the formation of intermetallic second phases. Therefore, HEAs often form simple solid solutions instead of many complex phases and thus have many excellent properties and characteristics, such as high strength, high toughness, high corrosion resistance, high wear resistance [19,20]. At the same time, due to the particular structure of HEAs, it is easy to perfectly combine strength, ductility, thermal stability, and oxidation resistance, which greatly meets the maximally demanding requirements for materials.…”

Section: Development Of High-entropy Alloysmentioning

confidence: 99%

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Development and Property Tuning of Refractory High-Entropy Alloys: A Review

Hua

Xing

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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In the past decade, multi-principal element high-entropy alloys (referred to as high-entropy alloys, HEAs) are an emerging alloy material, which has been developed rapidly and has become a research hotspot in the field of metal materials. It breaks the alloy design concept of one or two principal elements in traditional alloys. It is composed of five or more principal elements, and the atomic percentage (at.%) of each element is greater than 5% but not more than 35%. The high-entropy effect caused by the increase of alloy principal elements makes the crystals easy form body-centered cubic or face-centered cubic structures, and may be accompanied by intergranular compounds and nanocrystals, to achieve solid solution strengthening, precipitation strengthening, and dispersion strengthening. The optimized design of alloy composition can make HEAs exhibit much better than traditional alloys such as high-strength steel, stainless steel, copper-nickel alloy, and nickel-based superalloy in terms of high strength, high hardness, high-temperature oxidation resistance, and corrosion resistance. At present, refractory high-entropy alloys (RHEAs) containing high-melting refractory metal elements have excellent room temperature and high-temperature properties, and their potential high-temperature application value has attracted widespread attention in the high-temperature field. This article reviews the research status and preparation methods of RHEAs and analyzes the microstructure in each system and then summarizes the various properties of RHEAs, including high strength, wear resistance, high-temperature oxidation resistance, corrosion resistance, etc., and the common property tuning methods of RHEAs are explained, and the existing main strengthening and toughening mechanisms of RHEAs are revealed. This knowledge will help the on-demand design of RHEAs, which is a crucial trend in future development. Finally, the development and application prospects of RHEAs are prospected to guide future research.

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Section: Development Of High-entropy Alloysmentioning

confidence: 99%

“…(3) Other strengthening phases precipitated on the BCC matrix, such as HCP [20,52] Al x Zr 5 [53,54], M 5 Si 3 [55][56][57], etc.…”

Section: Reported Microstructure Of Rheasmentioning

confidence: 99%

Development and Property Tuning of Refractory High-Entropy Alloys: A Review

Hua

Xing

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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“…In this context, rareearth concentrated multi-principal-element systems or so-called high-entropy alloys (HEA) open up great perspectives in the search for efficient magnetic refrigerants. Recent studies of rare-earth HEAs have revealed complex magnetism and interesting caloric effects in these materials [11][12][13][14][15][16][17][18][19]. All these multicomponent alloys demonstrate strong magnetocaloric effect (MCE) over a wide temperature span (a table-like behavior) and consequently increased relative cooling power (RCP).…”

Section: Introductionmentioning

confidence: 99%

Magnetocaloric Effect in ScGdHo Medium-entropy Alloy

Упоров

Sterkhov

Balyakin

2022

Preprint

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The search for eﬀective solid-state refrigerant for magnetocaloric application is one of the main-stream topics in materials science. Rareearth multi-principal element alloys seem to be promising candidates for these purposes. In this study, we address the issues of structure formation, magnetic and magnetocaloric properties in ScGdHo medium entropy alloy. We perform the ab initio molecular dynamics simulations for the liquid and solid phases in this system and reveal a strong tendency to form a single-phase solid solu-tion. The experimentally fabricated alloy demonstrates a single-phase HCP crystalline structure with high density of defects. The magnetic measurements reveal a complicated magnetic behaviour in the material. The alloy exhibits antiferromagnetic or ferromagnetic behavior depending on the magnetic ﬁeld. We have found that AFM order is preferable under a weak magnetic ﬁeld and FM order occurs when the ﬁeld strength exceeds 12 kOe. The alloy reveals a rather large coercive force in a wide temperature range up to the Neel point. The values of the magnetic entropy change and relative cooling power calculated for a magnetic ﬁeld change of 0-5 T are 8.93 Jkg−1K−1 and 938 J/kg, respectively. The examined ScGdHo alloy demonstrates the best magnetocaloric properties among similar rareearth metal materials discovered to date.

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“…are known for their excellent resistant to heat, wear and to high temperature oxidation [10] and these properties make them good elements for HEAs. In literature, most of the studies of RHEAs have been based on face-centredcubic (FCC) or body-centred-cubic (BCC) [6], [7], [11]- [13] with a very few on hexagonal closed-packed (HCP) structures [5], [14]- [16]. Elastic properties provide fundamental insight into crystal structure and nature of bonding in materials, and help in predicting the mechanical behaviour of materials.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Approach to Investigate Temperature Dependent Ultrasonic and Thermophysical Properties of Ti-Zr-Hf Ternary Alloy

Singh¹,

Yadav²,

Singh³

et al. 2022

IJRASET

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In this study, we have computed temperature dependent ultrasonic and thermophysical properties of hcp medium entropy alloy Ti-Zr-Hf in temperature range of 0K-900K. Second order and third order elastic constants (SOECs and TOECs) have been calculated using lattice parameters using the Lennard-Jones potential model. With the help of SOECs and TOECs, the elastic parameters such as bulk modulus, shear modulus, Young’s modulus, Poisson’s ratio have been computed. SOECs were also utilized to determine the ultrasonic velocities at different angle along unique axis. Further, thermophysical properties such as Debye temperature, Debye heat capacity, energy density in temperature range of 0K-900K and thermal conductivity in temperature range of 300K-900K have also been theoretically estimated. Additionally, the ultrasonic attenuation due to phononphonon interaction in both longitudinal and shear mode and thermoelastic mechanism have been computed for chosen alloy in the temperature range 300K-900K and attenuation due to the phonon-phonon interaction was found to be dominating over that due to thermoelastic mechanism

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Preternatural Hexagonal High-Entropy Alloys: A Review

Cited by 41 publications

References 72 publications

Development and Property Tuning of Refractory High-Entropy Alloys: A Review

Development and Property Tuning of Refractory High-Entropy Alloys: A Review

Magnetocaloric Effect in ScGdHo Medium-entropy Alloy

Theoretical Approach to Investigate Temperature Dependent Ultrasonic and Thermophysical Properties of Ti-Zr-Hf Ternary Alloy

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