Decelerated grain growth kinetic and effectiveness of Hall-Petch relationship in a cold-rolled non-equiatomic high entropy alloy

Mohammad-Ebrahimi, M.H.; Zarei-Hanzaki, A.; Abedi, H.R.; Vakili, S.M.; Soundararajan, Chandrahaasan K.

doi:10.1016/j.jallcom.2021.159849

Cited by 20 publications

(6 citation statements)

References 45 publications

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“…(Figure 4, Figure 7). In comparison with Mohammad-Ebrahimi et al work [37], it can be observed that the grain coarsening rate in the case of Cr 2 Fe 2 NiCo 0.67 Cu 0.67 Ti 0.33 is slower than that of the Fe 50 Mn 30 Co 10 Cr 10 HEA with an increasing heat-treatment duration. This should be mainly attributed to the formation of secondary phase precipitates along the grain boundaries during homogenising.…”

Section: Resultsmentioning

confidence: 52%

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On the microstructure and mechanical behaviour of the Cr₂Fe₂NiCo_0.67Cu_0.67Ti_0.33 alloy during homogenisation

Rezaee

Ketabchi

Shams

et al. 2022

Materials Science and Technology

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The present study investigates the microstructure and mechanical properties of the Cr2Fe2NiCo0.67Cu0.67Ti0.33 high-entropy alloy after homogenisation. The results show that the as-cast microstructure consisted mainly of a dual-phase FCC + σ structure. By heat-treating, the microstructure changed from the FCC + σ to the mixed FCC + BCC solid solutions. The EDS and XRD analysis show that despite different crystal structures of the σ and BCC phases, their chemical composition is the same. In addition, two kinds of precipitations, enriched by Ti and Cu, are found in the microstructure. Formation of these precipitates beside hard σ-phase resulted in an increase in hardness. Additionally, higher elongation and strain hardening ability achieved in the specimen that σ → BCC transformation occurred.

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Section: Resultsmentioning

confidence: 52%

“…This should be mainly attributed to the formation of secondary phase precipitates along the grain boundaries during homogenising. In fact, the second phase particles can sufficiently limit grain growth of the FCC matrix due to the Zener pinning effect [37].…”

Section: Resultsmentioning

confidence: 99%

On the microstructure and mechanical behaviour of the Cr₂Fe₂NiCo_0.67Cu_0.67Ti_0.33 alloy during homogenisation

Rezaee

Ketabchi

Shams

et al. 2022

Materials Science and Technology

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“…In FeMnCoCr-based high-entropy alloys, the incorporation of aluminum (Al) atoms can be strategically employed to fine-tune the stacking fault energy of the alloy system, placing it within an optimal range. This adjustment facilitates the activation of both TRIP and TWIP effects, consequently enhancing the alloy's work-hardening capability and overall mechanical performance [6][7][8][9][10] .…”

Section: Introductionmentioning

confidence: 99%

Dependence of Mechanical Properties and Deformation Behavior of TRIP-FeMnCoCrAl Dual-phase High-entropy Alloy on Grain Size and Strain Rate

Li,

Zhang,

Niu

et al. 2024

ISIJ Int.

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Fe 50 Mn 30 Co 10 Cr 10 dual-phase metastable high-entropy alloys(HEAS) have gained significant attention for their outstanding mechanical properties. However, limited research has explored the relationship between grain size and strain rate sensitivity (SRS) in dual-phase HEAS. Current investigations primarily focus on pure metals and single-phase FCC HEAS. To address this gap, this study examines the impact of grain size on the deformation behavior and SRS of TRIP-(Fe 50 Mn 30 Co 10 Cr 10 ) 97 Al 3 dual-phase HEAS. Two variants of dual-phase HEAS were prepared, distinguished by their grain sizes (2.86 μm, labeled Fine Grain or FG, and 5.25 μm, termed Coarse Grain or CG), via the vacuum melting method. Subsequent tensile tests were conducted at varying strain rates, ranging from 0.001/s to 0.02/s.The findings unveil a robust grain size dependency in the phase transformation and deformation twinning of the (Fe 50 Mn 30 Co 10 Cr 10 ) 97 Al 3 dual-phase HEA during tensile deformation. Within the FeMnCoCrAl HEA system, characterized by a dual-phase structure, both TRIP (Transformation-Induced Plasticity) and TWIP (Twinning-Induced Plasticity) effects intensify with increasing grain size. Additionally, as the strain rate increases, the TRIP effect gradually diminishes while the TWIP effect strengthens. Notably, the strain rate sensitivity index 'm' exhibits a downward trend with an increase in grain size, distinguishing it from the behavior observed in single-phase FCC HEAS. This study conducts an in-depth analysis of grain size's impact on the SRS of (Fe 50 Mn 30 Co 10 Cr 10 ) 97 Al 3 dual-phase HEA, scrutinizing micro-level aspects encompassing phase transformation, deformation twinning, and grain boundary slip. The findings provide essential theoretical insights for designing HEAS tailored for applications requiring high strain rates.

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“…In fact, many results are reported for coarse-grained as-cast materials, which would lead to the frequently low yield strengths reported in the literature [5]. Nevertheless, the microstructure of these alloys could be conveniently refined through the proper design of the processing route [13][14][15][16][17][18][19]. Most of the research in this field was mainly accomplished in equiatomic alloys, showing that the yield strength/ductility of these alloys can be considerably increased through the proper optimization of thermo-mechanical processing [13,14] and/or thermal treatments [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Control of the Microstructure in a Al5Co15Cr30Fe25Ni25 High Entropy Alloy through Thermo-Mechanical and Thermal Treatments

Pérez

Medina

Vega

et al. 2023

Metals

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The effect of thermos-mechanical processing and thermal treatments on the microstructure of a single phase fcc-based Al5Co15Cr30Fe25Ni25 high entropy alloy is evaluated in this study. As-cast ingots of the high entropy alloy were thermo-mechanically processed following different routes involving forging, cold rolling, warm rolling or hot rolling. In addition, the microstructural evolution of highly deformed cold rolled sheets with the annealing temperature was analyzed. The data reveal that a high-volume fraction of the microstructure commences to recrystallize from 600 °C. In the absence of recrystallization, i.e., below 600 °C, the hardness of thermo-mechanically processed and annealed samples was very close. When recrystallization takes place, the thermo-mechanically treated alloys exhibit higher hardness than the annealed alloys because the recrystallized grains are strengthened by dislocations generated in further steps of the processing while the alloys in the annealed condition are free of dislocations. Maximum hardening is found for the alloy warm-rolled at 450 °C and the alloy cold-rolled plus annealing at 500 °C for 1 h. Diffusion of solute atoms to the core of dislocations, pinning its movement, accounts for the additional hardening.

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Decelerated grain growth kinetic and effectiveness of Hall-Petch relationship in a cold-rolled non-equiatomic high entropy alloy

Cited by 20 publications

References 45 publications

On the microstructure and mechanical behaviour of the Cr₂Fe₂NiCo_0.67Cu_0.67Ti_0.33 alloy during homogenisation

On the microstructure and mechanical behaviour of the Cr₂Fe₂NiCo_0.67Cu_0.67Ti_0.33 alloy during homogenisation

Dependence of Mechanical Properties and Deformation Behavior of TRIP-FeMnCoCrAl Dual-phase High-entropy Alloy on Grain Size and Strain Rate

Control of the Microstructure in a Al5Co15Cr30Fe25Ni25 High Entropy Alloy through Thermo-Mechanical and Thermal Treatments

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Decelerated grain growth kinetic and effectiveness of Hall-Petch relationship in a cold-rolled non-equiatomic high entropy alloy

Cited by 20 publications

References 45 publications

On the microstructure and mechanical behaviour of the Cr2Fe2NiCo0.67Cu0.67Ti0.33 alloy during homogenisation

On the microstructure and mechanical behaviour of the Cr2Fe2NiCo0.67Cu0.67Ti0.33 alloy during homogenisation

Dependence of Mechanical Properties and Deformation Behavior of TRIP-FeMnCoCrAl Dual-phase High-entropy Alloy on Grain Size and Strain Rate

Control of the Microstructure in a Al5Co15Cr30Fe25Ni25 High Entropy Alloy through Thermo-Mechanical and Thermal Treatments

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On the microstructure and mechanical behaviour of the Cr₂Fe₂NiCo_0.67Cu_0.67Ti_0.33 alloy during homogenisation

On the microstructure and mechanical behaviour of the Cr₂Fe₂NiCo_0.67Cu_0.67Ti_0.33 alloy during homogenisation