Microstructures and thermodynamic properties of high-entropy alloys CoCrCuFeNi

Wu, Bo; Xie, Zheyu; Jinchang, Huang; Lin, Jinwei; Yang, Yixu; Jiang, Linqiao; Huang, Jiannan; Ye, Guoxin; Zhao, Chunfeng; Yang, Shangjin; Sa, Baisheng

doi:10.1016/j.intermet.2017.10.018

Cited by 60 publications

(13 citation statements)

References 28 publications

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“…Table also compares the binary pair enthalpy of mixing calculated using Miedema’s model for Al–Co–Cr–Fe–Ni–Mn, Al–Co–Cr–Fe–Ni, Co–Cr–Fe–Ni–Mn, and Co–Cr–Fe–Ni–Cu alloys. It is evident from Table and previous studies ,, that the addition of Al to equiatomic CoCrFeNi or CoCrFeNiMn beyond the solubility limit would lead to the formation of a second phase, while the addition of Cu would result in phase separation leading to the formation of two FCC phases . The Δ H Cu–X mix (X = Co, Cr, Fe, Ni) is positive, and therefore the addition of Cu in a significant amount may potentially result in phase separation in Co–Cr–Fe–Ni–Cu alloy.…”

Section: Resultssupporting

confidence: 81%

High Entropy and Sluggish Diffusion “Core” Effects in Senary FCC Al–Co–Cr–Fe–Ni–Mn Alloys

Mehta

Sohn

2020

ACS Comb. Sci.

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alloy exhibited a lower free energy of mixing, i.e., higher thermodynamic stability, than equiatomic Al x CoCrFeNiMn compositions, at 1100 °C and above. Therefore, the role of enthalpy was estimated to be significant in achieving higher thermodynamic stability in off-equiatomic alloys, since they always have lower entropy of mixing than their equiatomic counterparts. The magnitude of interdiffusion coefficients of individual elements in Al−Co−Cr−Fe−Ni−Mn alloys were compared to the interdiffusion coefficients in relevant quinary, quaternary, and ternary solvent-based alloys. Interdiffusion coefficients were not necessarily lower in FCC Al−Co−Cr−Fe−Ni−Mn alloys; therefore no sluggish diffusion was observed in FCC HEA, but diffusion of individual elements in BCC Al−Co−Cr−Fe−Ni−Mn alloy followed the sluggish diffusion hypothesis except for Ni. All compositions in the FCC Al−Co−Cr−Fe−Ni−Mn alloy were observed to comply with existing empirical single phase formation rules in high entropy alloys.

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Section: Resultssupporting

confidence: 81%

High Entropy and Sluggish Diffusion “Core” Effects in Senary FCC Al–Co–Cr–Fe–Ni–Mn Alloys

Mehta

Sohn

2020

ACS Comb. Sci.

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“…Meanwhile, the 1D concentration profile inside a columnar grain indicates a homogeneous elemental distribution (Figure 4a5), which is consistent with the previously reported as-cast bulk NiFeCoCrCu. [31] For the film irradiated to 370 dpa, only one GB is observed in the atom probe tip (Figure 4b1). The decreasing density of the GBs is attributed to irradiation-induced grain growth.…”

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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“…As a typical type with single-phase FCC, the FeCoCrNiCu HEA has good thermal stability and excellent mechanical properties [6] . Due to outstanding thermal stability, the FeCoCrNiCu HEA has been widely investigated in high temperature environment [7] .…”

Section: Introductionmentioning

confidence: 99%

Microstructural evolution and mechanical properties of FeCoCrNiCu high entropy alloys: a microstructure-based constitutive model and a molecular dynamics simulation study

Luo

Fang

et al. 2021

Appl. Math. Mech.-Engl. Ed.

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High entropy alloys (HEAs) attract remarkable attention due to the excellent mechanical performance. However, the origins of their high strength and toughness compared with those of the traditional alloys are still hardly revealed. Here, using a microstructure-based constitutive model and molecular dynamics (MD) simulation, we investigate the unique mechanical behavior and microstructure evolution of FeCoCrNiCu HEAs during the indentation. Due to the interaction between the dislocation and solution, the high dislocation density in FeCoCrNiCu leads to strong work hardening. Plentiful slip systems are stimulated, leading to the good plasticity of FeCoCrNiCu. The plastic deformation of FeCoCrNiCu is basically affected by the motion of dislocation loops. The prismatic dislocation loops inside FeCoCrNiCu are formed by the dislocations with the Burgers vectors of $${a \over 6}\left[ {\bar 11\bar 2} \right]$$ a 6 [ 1 ¯ 1 2 ¯ ] and $${a \over 6}\left[ {1\bar 12} \right]$$ a 6 [ 1 1 ¯ 2 ] , which interact with each other, and then emit along the 〈111〉 slip direction. In addition, the mechanical properties of FeCoCrNiCu HEA can be predicted by constructing the microstructure-based constitutive model, which is identified according to the evolution of the dislocation density and the stress-strain curve. Strong dislocation strengthening and remarkable lattice distortion strengthening occur in the deformation process of FeCoCrNiCu, and improve the strength. Therefore, the origins of high strength and high toughness in FeCoCrNiCu HEAs come from lattice distortion strengthening and the more activable slip systems compared with Cu. These results accelerate the discovery of HEAs with excellent mechanical properties, and provide a valuable reference for the industrial application of HEAs.

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Microstructures and thermodynamic properties of high-entropy alloys CoCrCuFeNi

Cited by 60 publications

References 28 publications

High Entropy and Sluggish Diffusion “Core” Effects in Senary FCC Al–Co–Cr–Fe–Ni–Mn Alloys

High Entropy and Sluggish Diffusion “Core” Effects in Senary FCC Al–Co–Cr–Fe–Ni–Mn Alloys

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

Microstructural evolution and mechanical properties of FeCoCrNiCu high entropy alloys: a microstructure-based constitutive model and a molecular dynamics simulation study

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