High pressure synthesis of a hexagonal close-packed phase of the high-entropy alloy CrMnFeCoNi

Tracy, Cameron L.; Park, Sulgiye; Rittman, Dylan R.; Zinkle, S.J.; Bei, Hongbin; Lang, Maik; Ewing, Rodney C.; Mao, Wendy L.

doi:10.1038/ncomms15634

Cited by 274 publications

(131 citation statements)

References 62 publications

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“…The chemical interactions in HEAs have been found to follow complex rules with long-ranged interactions causing chemical frustration [11]. This allows the tuning of structures and properties of high-entropy alloys in a manner that is not achievable with conventional alloys and phases [12]. Furthermore, HEAs have been found to be good model systems for investigating fundamental physical interactions, as their properties often fall between those of crystalline and amorphous materials, see e.g.…”

Section: Introductionmentioning

confidence: 99%

Isoelectronic substitutions and aluminium alloying in the Ta-Nb-Hf-Zr-Ti high-entropy alloy superconductor

Rohr

Cava

2018

Phys. Rev. Materials

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High-entropy alloys (HEAs) are a new class of materials constructed from multiple principal elements statistically arranged on simple crystallographic lattices.Due to the large amount of disorder present, they are excellent model systems for investigating the properties of materials intermediate between crystalline and amorphous states.Here we report the effects of systematic isoelectronic replacements, using Mo-Y, Mo-Sc, and Cr-Sc mixtures, for the valence electron count 4 and 5 elements in the BCC Ta-Nb-Zr-Hf-Ti high entropy alloy (HEA) superconductor. We find that the superconducting transition temperature T c strongly depends on the elemental make-up of the alloy, and not exclusively its electron count. The replacement of niobium or tantalum by an isoelectronic mixture lowers the transition temperature by more than 60 %, while the isoelectronic replacement of hafnium, zirconium, or titanium has a limited impact on T c . We further explore the alloying of aluminium into the nearly optimal electron count [TaNb] 0.67 (ZrHfTi) 0.33 HEA superconductor. The electron count dependence of the superconducting T c for (HEA)Al x is found to be more crystalline-like than for the [TaNb] 1-x (ZrHfTi) x HEA solid solution. For an aluminum content of x = 0.4 the high-entropy stabilization of the simple BCC lattice breaks down. This material crystallizes in the tetragonal β-uranium structure type and superconductivity is not observed above 1.8 K.

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Section: Introductionmentioning

confidence: 99%

Isoelectronic substitutions and aluminium alloying in the Ta-Nb-Hf-Zr-Ti high-entropy alloy superconductor

Rohr

Cava

2018

Phys. Rev. Materials

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“…Compared with temperature, pressure is a more influential controlling parameter in the aspects of decreasing the volume, tuning the packing, and adjusting the energy state. High‐pressure processing of HEAs can obtain accessible phases that cannot be prepared by conventional methods 128. In this part, strain is manifested to have a great impact on the phase structure, including the lattice rearrangement, magnetic moment, and stress concentration 128–130…”

Section: Phase Engineering Of Heasmentioning

confidence: 99%

“…This work, for the first time, achieved the HCP phase in HEAs at ambient conditions, which revealed that pressure could overcome the kinetic barrier between HCP and FCC HEAs. Moreover, Tracy et al took a similar approach to obtain HCP phase of CrMnFeCoNi via a high‐pressure synthesis, and further proposed the mechanism of pressure‐suppressed HEA magnetic moment 128. They found that an HCP phase appeared at 14 GPa and the phase fraction reached a maximum value at 54.1 GPa during the pressure increasing process.…”

Section: Phase Engineering Of Heasmentioning

confidence: 99%

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Phase Engineering of High‐Entropy Alloys

et al. 2020

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High‐entropy alloys (HEAs) are based on five or more principal elements with equal or nearly equal molar fractions and possess many significant advantages over traditional alloys, including high strength and hardness, excellent corrosion resistance, outstanding thermal stability, and irradiation resistance. Phase structure plays a vital role in determining the property of HEAs. For further enhancing the performance of HEAs in various application fields, a controllable synthesis with desired phases is required. In this review, the diverse phase structures of HEAs and the related properties are first introduced. Then, alternative tuning strategies to promote the desired phase structure of HEAs are focused upon. Property adjusting of phase‐engineered HEAs is also discussed in depth. Lastly, some insights into the challenges and future prospects in this rapidly emerging research field are provided.

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“…[16,187] The polymorphic transition from FCC to HCP was observed in Cantor alloy using in-situ high-pressure synchrotron radiation XRD technique. [188,189] It has been reported that the stable phase of CrMnFeCoNi alloy at low temperatures and high pressures is HCP phase, whereas the FCC phase is stable at higher temperatures and low pressures. The coexistence of FCC and HCP phases occurs in the pressure range of %22 to %41 GPa.…”

Section: Crmnfeconimentioning

confidence: 99%

High‐Entropy Alloys: Potential Candidates for High‐Temperature Applications – An Overview

2017

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Multi-principal elemental alloys, commonly referred to as high-entropy alloys (HEAs), are a new class of emerging advanced materials with novel alloy design concept. Unlike the design of conventional alloys, which is based on one or at most two principal elements, the design of HEA is based on multi-principal elements in equal or near-equal atomic ratio. The advent of HEA has revived the alloy design perception and paved the way to produce an ample number of compositions with different combinations of promising properties for a variety of structural applications. Among the properties possessed by HEAs, sluggish diffusion and strength retention at elevated temperature have caught wide attention. The need to develop new materials for high-temperature applications with superior high-temperature properties over superalloys has been one of the prime concerns of the high-temperature materials research community. The current article shows that HEAs have the potential to replace Ni-base superalloys as the next generation hightemperature materials. This review focuses on the phase stability, microstructural stability, and high-temperature mechanical properties of HEAs. This article will be highly beneficial for materials science and engineering community whose interest is in the development and understanding of HEAs for high-temperature applications.

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High pressure synthesis of a hexagonal close-packed phase of the high-entropy alloy CrMnFeCoNi

Cited by 274 publications

References 62 publications

Isoelectronic substitutions and aluminium alloying in the Ta-Nb-Hf-Zr-Ti high-entropy alloy superconductor

Isoelectronic substitutions and aluminium alloying in the Ta-Nb-Hf-Zr-Ti high-entropy alloy superconductor

Phase Engineering of High‐Entropy Alloys

High‐Entropy Alloys: Potential Candidates for High‐Temperature Applications – An Overview

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