Enhancing mechanical properties of Al0.25CoCrFeNi high-entropy alloy via cold rolling and subsequent annealing

He, Yixuan; Yang, Haiou; Zhao, Chao; Yu, Zhong‐Zhen; Pan, Xiangyu; Li, Jinshan; Wang, Jun

doi:10.1016/j.jallcom.2020.154645

Cited by 27 publications

(20 citation statements)

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“…The phase remained in a single fcc phase after the cold-rolled Al 0.25 CoCrFeNi was annealed at 1,100°C for 10 h (Hou et al, 2017b). The grain size was reduced from 230 to ∼13 μm through multiple cold rolling and annealing processes (He et al, 2020), as shown in Figure 4B. The grain size could also be adjusted in a wide range in a single fcc phase Al 0.3 CoCrFeNi alloy (Gwalani et al, 2017).…”

Section: Effect Of Cold Deformation and Annealing On The Microstructurementioning

confidence: 94%

“…The resultant phases in all the investigated as-cast Al x CoCrFeNi HEA system (x 0-3) were: only solid-solution structures, mainly fcc, bcc or their mixture (Kao et al, 2009;Li et al, 2009;Ma et al, 2014;Wang et al, 2014;Zuo et al, 2014;Niu et al, 2016;Xia et al, 2016;Gangireddy et al, 2018a;Gangireddy et al, 2018b;Liu et al, 2018;Zhou et al, 2018;Annasamy et al, 2019;Li et al, 2019;He et al, 2020). Alloys with low Al contents (x 0-0.3) exhibited the simple fcc structure, as x exceeded ∼0.5, the bcc phase formed out of the fcc solid solution phase.…”

Section: Effects Of Al Addition On Microstructure Of Al X Cocrfeni Heasmentioning

confidence: 97%

“…Optimized thermal-mechanical processing by deformation and subsequent annealing could lead to the grain refinement and formation of the strengthening phase. Figure 4 exhibits the microstructures of ultrafine grains and/or nanostructured precipitates generated simply through cold deformation and annealing under different conditions (Guo et al, 2018;Gwalani et al, 2018;Shi et al, 2018;Hou et al, 2019;Wu et al, 2019;He et al, 2020). In the meantime, Wang et al (2018c) investigated the effect of cold rolling on the fcc to bcc transformation kinetics of the Al 0.5 CoCrFeNi HEA and concluded that pre-deformation induced defects could facilitate the nucleation and growth process during the phase transition compared with the as-cast sample.…”

Section: Thermo-mechanical Coupling Effect Microstructure Evolution Amentioning

confidence: 99%

“…This section describes the effect of cold deformation and subsequent annealing on the microstructure of Al x CoCrFeNi HEAs. It reviews the recrystallization and grain growth of Al x CoCrFeNi alloys, and 25 CoCrFeNi HEA generated by directly annealing after cold rolling (He et al, 2020). (C) Tri-phase Al 0.3 CoCrFeNi HEA consisting of fcc, B2 and σ phases (Gwalani et al, 2018).…”

Section: Effect Of Cold Deformation and Annealing On The Microstructurementioning

confidence: 99%

“…The tensile yield strength of the fcc-based Al 0.25 CoFeCrNi and Al 0.3 CoFeCrNi HEAs can be easily tuned via different thermalmechanical processes, e.g., cold rolling and subsequent annealing (CRSA), as shown in Figure 6 (Gwalani et al, 2017;Hou et al, 2017a;Gwalani et al, 2020;He et al, 2020). Hou et al (2017a) carried out cold rolling processing on Al 0.25 CoFeCrNi, resulting in a substantial strengthening of the alloy, with yield strength approaching 1,280 MPa ( Figure 6A); however, this was at the expense of low ductility (ε ∼2.3%).…”

Section: Mechanical Properties and Deformation Behaviormentioning

confidence: 99%

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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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Section: Effect Of Cold Deformation and Annealing On The Microstructurementioning

confidence: 94%

Section: Effects Of Al Addition On Microstructure Of Al X Cocrfeni Heasmentioning

confidence: 97%

Section: Thermo-mechanical Coupling Effect Microstructure Evolution Amentioning

confidence: 99%

Section: Effect Of Cold Deformation and Annealing On The Microstructurementioning

confidence: 99%

Section: Mechanical Properties and Deformation Behaviormentioning

confidence: 99%

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

Yang

Wang

et al. 2021

Front. Mater.

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Microstructural Evolution, Mechanical Properties, and Corrosion Behavior of an Al_7.5Co_20.5Fe₂₄Ni₂₄Cr₂₄ High‐Entropy Alloy

et al. 2022

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The relationship among microstructure, mechanical properties, and corrosion behavior of an Al7.5Co20.5Fe24Ni24Cr24 high‐entropy alloy (HEA) is systematically studied. The as‐cast HEA consisted of a single face‐centered cubic (FCC) phase with negligible chemical inhomogeneities of Al and Ni elements, whereas the homogenized HEA displayed a single FCC supersaturated solid‐solution phase with uniform distribution of constituent elements. Homogenization followed by aging at 900 and 700 °C leads to the formation of different precipitates in the FCC matrix. As the variety and volume fraction of precipitates increased, the HEA samples accordingly show enhanced strengths accompanied by slight losses in ductility. However, the formation of L12, B2, and σ precipitates is detrimental to the electrochemical properties of the HEAs. Improving the homogeneity of elemental distribution leads to a higher content of Cr oxides and Co(Fe,Cr)2O4 complex oxides in the passivation film, rendering an enhancement of corrosion resistance of the HEA in sulfuric acid. This work reveals the influence of chemical inhomogeneities and precipitates on the mechanical and electrochemical properties of the FCC‐structured Al7.5Co20.5Fe24Ni24Cr24 HEA via tuning phase composition, providing an interesting insight into how to balance the structural (strength and ductility) and functional (anti‐corrosion) properties of HEAs.

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Strengthening and Toughening of the Co₃₄Cr₃₂Ni₂₇Al_3.5Ti_3.5 Alloy Through Coherent L1₂ Nanoprecipitates

Li,

Song,

Gao

et al. 2024

Adv Eng Mater

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In this work, the L12‐strengthened Co34Cr32Ni27Al3.5Ti3.5 medium‐entropy alloy (MEA) with outstanding strength and ductility was developed through cold rolling and annealing (CRA). The CRA promotes the formation of coherent L12 nanoprecipitates in the matrix and precipitates inside the grains (Ti‐rich phases), resulting in dislocation sliding and multiplication during deformation. The as‐cast sample exhibits low yield strength (YS) of ∽498.5 MPa, ultimate tensile strength (UTS) of ∽820.5 MPa, and uniform elongation (UE) of ∽29.8%. After cold rolling and annealing, the YS, UTS, and UE are significantly increased to ∽678.4 MPa, ∽1109.3 MPa, and ∽44.5%, respectively. The excellent mechanical performance results from dislocation strengthening and precipitation strengthening of the L12 phase. The trade‐off of strength‐ductility is resolved by achieving an appropriate balance between the hard phase rich in L12/Ti and the soft FCC phase. Our finding demonstrates that the CRA method can be used to create coherent L12 nanoprecipitates that are beneficial for strong and ductile MEA. This work provides a broader perspective for CoCrNi‐based MEAs with high performance in the future.This article is protected by copyright. All rights reserved.

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Enhancing mechanical properties of Al0.25CoCrFeNi high-entropy alloy via cold rolling and subsequent annealing

Cited by 27 publications

References 51 publications

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

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

Microstructural Evolution, Mechanical Properties, and Corrosion Behavior of an Al_7.5Co_20.5Fe₂₄Ni₂₄Cr₂₄ High‐Entropy Alloy

Strengthening and Toughening of the Co₃₄Cr₃₂Ni₂₇Al_3.5Ti_3.5 Alloy Through Coherent L1₂ Nanoprecipitates

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Enhancing mechanical properties of Al0.25CoCrFeNi high-entropy alloy via cold rolling and subsequent annealing

Cited by 27 publications

References 51 publications

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

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

Microstructural Evolution, Mechanical Properties, and Corrosion Behavior of an Al7.5Co20.5Fe24Ni24Cr24 High‐Entropy Alloy

Strengthening and Toughening of the Co34Cr32Ni27Al3.5Ti3.5 Alloy Through Coherent L12 Nanoprecipitates

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Microstructural Evolution, Mechanical Properties, and Corrosion Behavior of an Al_7.5Co_20.5Fe₂₄Ni₂₄Cr₂₄ High‐Entropy Alloy

Strengthening and Toughening of the Co₃₄Cr₃₂Ni₂₇Al_3.5Ti_3.5 Alloy Through Coherent L1₂ Nanoprecipitates