Metastability in high-entropy alloys: A review

Wei, Shaolou; He, Feng; Taşan, Cemal Cem

doi:10.1557/jmr.2018.306

Cited by 96 publications

(25 citation statements)

References 117 publications

(162 reference statements)

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“…[11][12][13] The metastable microstructures resulting from considerable local lattice distortions demonstrate a high potential for creating new phases under specific environments. [14,15] A load-driven phase transformation from a facecentered cubic (FCC) matrix to a hexagonal-close-packed (HCP) nanolaminate structure was reported in a CoCrFeMnNi HEA system. [2,4,16] Actually, such pressure-induced phase transformations have been observed in several HEAs under different critical pressures depending on the alloy compositions.…”

Section: Doi: 101002/adma202002652mentioning

confidence: 99%

Irradiation‐Induced Extremes Create Hierarchical Face‐/Body‐Centered‐Cubic Phases in Nanostructured High Entropy Alloys

Jiang

Sun

et al. 2020

Advanced Materials

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A nanoscale hierarchical dual-phase structure is reported to form in a nanocrystalline NiFeCoCrCu high-entropy-alloy (HEA) film via ion irradiation. Under the extreme energy deposition and consequent thermal energy dissipation induced by energetic particles, a fundamentally new phenomenon is revealed, in which the original single-phase face-centered-cubic (FCC) structure partially transforms into alternating nanometer layers of a body-centered-cubic (BCC) structure. The orientation relationship follows the Nishiyama-Wasserman relationship, that is, (011) BCC || (111) FCC and [100] BCC || [ 110] FCC. Simulation results indicate that Cr, as a BCC stabilizing element, exhibits a tendency to segregate to the stacking faults (SFs). Furthermore, the high densities of SFs and twin boundaries in each nanocrystalline grain serve to accelerate the nucleation and growth of the BCC phase during irradiation. By adjusting the irradiation parameters, desired thicknesses of the FCC and BCC phases in the laminates can be achieved. This work demonstrates the controlled formation of an attractive dual-phase nanolaminate structure under ion irradiation and provides a strategy for designing new derivate structures of HEAs.

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Section: Doi: 101002/adma202002652mentioning

confidence: 99%

Irradiation‐Induced Extremes Create Hierarchical Face‐/Body‐Centered‐Cubic Phases in Nanostructured High Entropy Alloys

Jiang

Sun

et al. 2020

Advanced Materials

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“…In general, as PEL is derived from overall inter-atomic potentials, 28 phase prediction in HEAs therefore must entail many-body interactions. On the other hand, phases in HEAs are commonly metastable in nature, 30 which depend on the method of materials synthesis and processing. Because of these complexities, the issue of phase selection in HEAs is still open today although substantial efforts have been made over the past decade.…”

Section: Introductionmentioning

confidence: 99%

Machine learning guided appraisal and exploration of phase design for high entropy alloys

et al. 2019

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High entropy alloys (HEAs) and compositionally complex alloys (CCAs) have recently attracted great research interest because of their remarkable mechanical and physical properties. Although many useful HEAs or CCAs were reported, the rules of phase design, if there are any, which could guide alloy screening are still an open issue. In this work, we made a critical appraisal of the existing design rules commonly used by the academic community with different machine learning (ML) algorithms. Based on the artificial neural network algorithm, we were able to derive and extract a sensitivity matrix from the ML modeling, which enabled the quantitative assessment of how to tune a design parameter for the formation of a certain phase, such as solid solution, intermetallic, or amorphous phase. Furthermore, we explored the use of an extended set of new design parameters, which had not been considered before, for phase design in HEAs or CCAs with the ML modeling. To verify our ML-guided design rule, we performed various experiments and designed a series of alloys out of the Fe-Cr-Ni-Zr-Cu system. The outcomes of our experiments agree reasonably well with our predictions, which suggests that the ML-based techniques could be a useful tool in the future design of HEAs or CCAs.

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“…These results are summarized in Table 1 and are subsequently reviewed in detail. The microstructural and compositional metastability of HEAs was nicely reviewed by Wei et al [ 50 ]. In this paper, we focus on very recent results about phase stability and transitions under high pressure and provide a brief review of the relevant experimental methods, issues, and perspectives for future study.…”

Section: Introductionmentioning

confidence: 99%

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

Zhang

Lou

Cheng

et al. 2019

Entropy

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High-entropy alloys (HEAs) as a new class of alloy have been at the cutting edge of advanced metallic materials research in the last decade. With unique chemical and topological structures at the atomic level, HEAs own a combination of extraordinary properties and show potential in widespread applications. However, their phase stability/transition, which is of great scientific and technical importance for materials, has been mainly explored by varying temperature. Recently, pressure as another fundamental and powerful parameter has been introduced to the experimental study of HEAs. Many interesting reversible/irreversible phase transitions that were not expected or otherwise invisible before have been observed by applying high pressure. These recent findings bring new insight into the stability of HEAs, deepens our understanding of HEAs, and open up new avenues towards developing new HEAs. In this paper, we review recent results in various HEAs obtained using in situ static high-pressure synchrotron radiation x-ray techniques and provide some perspectives for future research.

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Metastability in high-entropy alloys: A review

Abstract: Abstract

Cited by 96 publications

References 117 publications

Irradiation‐Induced Extremes Create Hierarchical Face‐/Body‐Centered‐Cubic Phases in Nanostructured High Entropy Alloys

Irradiation‐Induced Extremes Create Hierarchical Face‐/Body‐Centered‐Cubic Phases in Nanostructured High Entropy Alloys

Machine learning guided appraisal and exploration of phase design for high entropy alloys

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

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