Effects of annealing temperature and cooling medium on the microstructure and mechanical properties of a novel dual phase high entropy alloy

Yu, Haoyang; Fang, Wei; Chang, Ruobin; Bai, Xi; Zhang, Xin; Liu, Baoxi; Jiang, Yihua; Yin, Fuxing

doi:10.1016/j.matchar.2020.110291

Cited by 18 publications

(6 citation statements)

References 32 publications

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“…This phenomenon is attributed to the enhanced work-hardening ability caused by the increase of phase stability of the FCC matrix and excellent grain boundary strengthening. Meanwhile, a recent study by Yu et al [89] on a novel DP HEA (Co 35 Cr 25 Fe 37.5 Ni 2.5 ) has shown a similar effect, which investigates the effects of annealing temperature and cooling medium on the grain size and HCP phase fraction. Interestingly, the HCP phase fraction is doubled and HCP laminates of different orientations intersect within the grains as the cooling medium of water is replaced by liquid nitrogen (Figure 4).…”

Section: Microstructure and Mechanical Propertiesmentioning

confidence: 99%

A brief review of metastable high-entropy alloys with transformation-induced plasticity

Zhang

Fang

et al. 2020

Materials Science and Technology

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In metastable high-entropy alloys (HEAs), the decrease of phase stability enables the development of dual-phase microstructure (interface hardening) and occurrence of strain-induced martensitic transformation (transformation-induced hardening), which overcomes the strength–ductility trade-off. The stacking-fault energy (SFE) is closely related to the phase stability and plays a key role in controlling the underlying deformation mechanism and hence the mechanical performance of HEAs. Here, we review some approaches of SFE calculation, including theoretical and experimental methods as well as the factors affecting SFE. Several compositional systems related to metastable HEAs are also briefly reviewed. Furthermore, we show the unique microstructure and the structure–property relationship of the metastable HEAs. Furthermore, some potential research topics in the future are also proposed.

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Section: Microstructure and Mechanical Propertiesmentioning

confidence: 99%

A brief review of metastable high-entropy alloys with transformation-induced plasticity

Zhang

Fang

et al. 2020

Materials Science and Technology

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“…[ 3–8 ] Furthermore, HEAs also show some interesting engineering properties, such as high hardness and strength, good thermal stability, excellent wear, and corrosion resistances. [ 9,10 ] Therefore, HEAs have many interests in engineering applications.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study on Corrosion Behaviors of Fe35Mn10Cr20Ni35 High‐Entropy Alloy and 304 Stainless Steel in Sulfuric Acid Aqueous Solution

Zhou

Jiang²,

Liao

et al. 2022

Adv Eng Mater

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Herein, the corrosion behaviors of Fe35Mn10Cr20Ni35 high‐entropy alloy (HEA) and commercial 304 stainless steel (304 SS) in 0.5 M H2SO4 aqueous solutions are evaluated. Potentiodynamic polarization test results indicate that both the prepared HEA and 304 SS possess a large passive interval, illustrating that they have a strong capability to form passive films. The prepared HEA possesses higher corrosion potentials and lower corrosion current densities than that of 304 SS, thus it has more superior corrosion resistance. The electrochemical impedance spectroscopy and electrical equivalent circuits results indicate that the charge‐transfer resistance of HEA is higher than that of 304 SS and the passive films of the prepared HEA is thicker than that of 304 SS. These indicate that the passive film on the prepared HEA has an excellent protective ability to prevent further corrosion. X‐Ray photoelectron spectroscopy results indicate that the passive film of the prepared HEA samples is mainly composed of compacted metal oxides, especially Cr2O3‐dense oxides, while the passive film of 304 SS is mainly composed of loose hydroxides and compacted metal oxides. That is the key reason why the prepared HEA has better corrosion resistance than 304 SS.

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“…The optimization of the mechanical properties of high-entropy alloys is thus challenging. Recently, studies have focused on overcoming the strength-ductility trade off, by introducing high-density nano-twins in the grains (Lu, 2016;Schneider et al, 2020), as processing fine grains combined with nanoscale precipitates even distribution within the grains (Zhao et al, 2020b;Guillot et al, 2020;Yu et al, 2020), controlling the lattice misfit between intermetallic nanoparticles and matrix (Miracle, 2015;He et al, 2016a;Zhang et al, 2019) and producing materials with a heterogeneous structure (Sun et al, 2018;Wu et al, 2019;Du et al, 2020). The successful preparation of eutectic high-entropy alloy (EHEA) provided a new way to optimize the phase structure of HEAs by combining the ductile phase (e.g., fcc solid-solution phase) with the hard phase (e.g., bcc solid-solution phase or intermetallics) (Lu et al, 2014;Tan et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Thermal–Mechanical Processing and Strengthen in AlxCoCrFeNi High-Entropy Alloys

Yang

Wang

et al. 2021

Front. Mater.

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In this study high-entropy alloys (HEAs) were devised based on a new alloy design concept, which breaks with traditional design methods for conventional alloys. As a novel alloy, HEAs have demonstrated excellent engineering properties and possible combinations of diverse properties for their unique tunable microstructures and properties. This review article explains the phase transition mechanism and mechanical properties of high-entropy alloys under the thermal-mechanical coupling effect, which is conducive to deepening the role of deformation combines annealing on the structure control and performance improvement of high-entropy alloys, giving HEAs a series of outstanding performance and engineering application prospect. To reach this goal we have explored the microstructural evolution, formation of secondary phases at high and/or intermediate temperatures and their effect on the mechanical properties of the well known AlxCoCrFeNi HEAs system, which not only has an important role in deepening the understanding of phase transition mechanism in AlxCoCrFeNi HEAs, but also has important engineering application value for promoting the application of high-entropy alloys.

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Effects of annealing temperature and cooling medium on the microstructure and mechanical properties of a novel dual phase high entropy alloy

Cited by 18 publications

References 32 publications

A brief review of metastable high-entropy alloys with transformation-induced plasticity

A brief review of metastable high-entropy alloys with transformation-induced plasticity

A Comparative Study on Corrosion Behaviors of Fe35Mn10Cr20Ni35 High‐Entropy Alloy and 304 Stainless Steel in Sulfuric Acid Aqueous Solution

Thermal–Mechanical Processing and Strengthen in AlxCoCrFeNi High-Entropy Alloys

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