High-Pressure Induced Phase Transitions in High-Entropy Alloys: A Review

Zhang, Fei; Lou, Hongbo; Cheng, Benyuan; Zeng, Zhidan; Zeng, Qiaoshi

doi:10.3390/e21030239

Cited by 25 publications

(13 citation statements)

References 79 publications

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“…Hydrostatic pressure applied to the Cantor alloy stabilizes the HCP structure [7]. To transform the FCC phase to HCP a certain onset pressure is necessary depending on hydrostaticity and grain size.…”

Section: Microstructure Developmentmentioning

confidence: 99%

“…This alloy 2 of 14 is stable as an FCC single-phase solid solution at high temperatures above about 1073 K [3,4], but decomposes into several different metallic and intermetallic phases during annealing at intermediate temperatures [4][5][6]. Application of hydrostatic pressure at room temperature (RT) transforms it to the HCP structure, see recent review [7]. The transformation is sluggish and occurs over a large pressure range.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure, Texture, and Strength Development during High-Pressure Torsion of CrMnFeCoNi High-Entropy Alloy

et al. 2020

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The equiatomic face-centered cubic high-entropy alloy CrMnFeCoNi was severely deformed at room and liquid nitrogen temperature by high-pressure torsion up to shear strains of about 170. Its microstructure was analyzed by X-ray line profile analysis and transmission electron microscopy and its texture by X-ray microdiffraction. Microhardness measurements, after severe plastic deformation, were done at room temperature. It is shown that at a shear strain of about 20, a steady state grain size of 24 nm, and a dislocation density of the order of 1016 m−2 is reached. The dislocations are mainly screw-type with low dipole character. Mechanical twinning at room temperature is replaced by a martensitic phase transformation at 77 K. The texture developed at room temperature is typical for sheared face-centered cubic nanocrystalline metals, but it is extremely weak and becomes almost random after high-pressure torsion at 77 K. The strength of the nanocrystalline material produced by high-pressure torsion at 77 K is lower than that produced at room temperature. The results are discussed in terms of different mechanisms of deformation, including dislocation generation and propagation, twinning, grain boundary sliding, and phase transformation.

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Section: Microstructure Developmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructure, Texture, and Strength Development during High-Pressure Torsion of CrMnFeCoNi High-Entropy Alloy

et al. 2020

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“…They reviewed the use of dynamic high pressure, diamond anvil cells, high pressure torsion and hexahedron anvil press. Zhang et al [128] reviewed high pressure induced phase transitions in HEAs. Application of high pressure torsion [37,[129][130][131][132][133][134][135][136][137][138][139][140][141][142] is more frequent than other pressure techniques [136,[143][144][145][146][147][148][149][150].…”

Section: Background and Conventional Methodsmentioning

confidence: 99%

Recent Advances in Additive Manufacturing of High Entropy Alloys and Their Nuclear and Wear-Resistant Applications

Sonal

Lee

2021

Metals

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Alloying has been very common practice in materials engineering to fabricate metals of desirable properties for specific applications. Traditionally, a small amount of the desired material is added to the principal metal. However, a new alloying technique emerged in 2004 with the concept of adding several principal elements in or near equi-atomic concentrations. These are popularly known as high entropy alloys (HEAs) which can have a wide composition range. A vast area of this composition range is still unexplored. The HEAs research community is still trying to identify and characterize the behaviors of these alloys under different scenarios to develop high-performance materials with desired properties and make the next class of advanced materials. Over the years, understanding of the thermodynamics theories, phase stability and manufacturing methods of HEAs has improved. Moreover, HEAs have also shown retention of strength and relevant properties under extreme tribological conditions and radiation. Recent progresses in these fields are surveyed and discussed in this review with a focus on HEAs for use under extreme environments (i.e., wear and irradiation) and their fabrication using additive manufacturing.

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“…Many interesting reversible/irreversible phase transitions that were not expected or otherwise invisible before have been observed by applying high pressure. Zhang et al [ 12 ] reviewed recent results in various HEAs obtained using in situ static high-pressure synchrotron radiation X-ray techniques and provided some perspectives for future research.…”

Section: Preparation and Processingmentioning

confidence: 99%