Role of local chemical fluctuations in the melting of medium entropy alloy CoCrNi

Jian, Wu-Rong; Wang, L.; Bi, W. B.; Xu, Shuozhi; Beyerlein, Irene J.

doi:10.1063/5.0064299

Cited by 16 publications

(3 citation statements)

References 44 publications

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“…Because it homogenizes the lattice, SRO usually decreases the average lattice distortion in CCMs 76 . The reduction of lattice distortion usually results in a decreased availability of nucleation sites for new phases or defects, and this, in turn, may increase the melting temperature 92 or affect solid-solid phase transitions, for example.…”

Section: Stacking Fault Energymentioning

confidence: 99%

Simulating short-range order in compositionally complex materials

et al. 2023

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Section: Stacking Fault Energymentioning

confidence: 99%

Simulating short-range order in compositionally complex materials

et al. 2023

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“…Of importance to plasticity studies, the potential is well characterized in terms of the energetics of the stacking faults (89). Since its introduction, the potential has been extensively used for studying the CrCoNi alloy (48,(90)(91)(92)(93), including the effects of lattice distortion and chemical short-range order on the deformation mechanisms of the CrCoNi alloy under shock loading (63,94).…”

Section: Simulationsmentioning

confidence: 99%

Deformation and failure of the CrCoNi medium-entropy alloy subjected to extreme shock loading

et al. 2023

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The extraordinary work hardening ability and fracture toughness of the face-centered cubic (fcc) high-entropy alloys render them ideal candidates for many structural applications. Here, the deformation and failure mechanisms of an equiatomic CrCoNi medium-entropyalloy (MEA) were investigated by powerful laser-driven shock experiments. Multiscale characterization demonstrates that profuse planar defects including stacking faults, nanotwins, and hexagonal nanolamella were generated during shock compression, forming a three-dimensional network. During shock release, the MEA fractured by strong tensile deformation and numerous voids was observed in the vicinity of the fracture plane. High defect populations, nanorecrystallization, and amorphization were found adjacent to these areas of localized deformation. Molecular dynamics simulations corroborate the experimental results and suggest that deformation-induced defects formed before void nucleation govern the geometry of void growth and delay their coalescence. Our results indicate that the CrCoNi-based alloys are impact resistant, damage tolerant, and potentially suitable in applications under extreme conditions.

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“…At an low impact velocity, dislocation slip and twinning dominate and amorphization does not happen, but as the impact velocity increases, the deformation mechanism shifts from slip and twinning to solid-state amorphization [42]. In addition, LD accelerates the melting process and reduces the melting temperature by lowering the energy barrier of the nucleation of amorphous clusters and then promoting the formation of amorphization [43]. Wang et al [44] found that higher impact velocity nucleate more voids followed by a fast void growing and coalescence and also resulting in higher temperature increment.…”

Section: Mechanical Property Analysismentioning

confidence: 99%

Molecular dynamics analysis of the low-temperature shock behavior of the CoCrFeMnNi high-entropy alloy

Chen¹,

Li²,

Tang³

et al. 2022

Modelling Simul. Mater. Sci. Eng.

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This study presents a non-equilibrium molecular dynamics simulation of the shock compression of a [1¯10]-oriented CoCrFeMnNi high-entropy alloy (HEA) at 77 K. The effects of different impact velocities on the mechanical properties were investigated in detail, as well as the changes in atomic microstructure and the formation of defects and dislocations under impact loading. In addition, the role of voids in the CoCrFeMnNi HEA was investigated. The results showed that with an increase in impact velocity, the average values of the atomic velocity, temperature, and stress increase. The phenomenon of double-wave separation of the elastic and plastic waves was apparent, and when the loading velocity increased, the propagation velocities of the elastic and plastic waves also increased incrementally. The change in the atomic microstructure and generation of dislocation defects further revealed the effect of different impact velocities on the CoCrFeMnNi HEA. The degree of change in the phase structure was positively correlated with the magnitude of the impact velocity; however, the number of dislocations and defects first increased to a maximum and then decreased with the increase in impact velocity. In addition, the void structure had almost no effect on the phase change of the HEA when subjected to impact loading, whereas the effect on dislocation defects was more pronounced.

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Role of local chemical fluctuations in the melting of medium entropy alloy CoCrNi

Cited by 16 publications

References 44 publications

Simulating short-range order in compositionally complex materials

Simulating short-range order in compositionally complex materials

Deformation and failure of the CrCoNi medium-entropy alloy subjected to extreme shock loading

Molecular dynamics analysis of the low-temperature shock behavior of the CoCrFeMnNi high-entropy alloy

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