Strain rate dependent shear localization and deformation mechanisms in the CrMnFeCoNi high-entropy alloy with various microstructures

Yang, Zhengling; Yang, Meng; Ma, Ying; Zhou, Lingling; Cheng, Wenqiang; Yuan, Fuping; Wu, Xiaolei

doi:10.1016/j.msea.2020.139854

Cited by 39 publications

(4 citation statements)

References 67 publications

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“…It has been used interchangeably with SB as both reflect the damage of material localization 57 . SB is formed under large shear deformation such as equal‐channel angular pressing of aluminum alloy, biaxial loaded NiTi, and cold rolling of high‐entropy alloys 58–60 . Elibol and Wagner 61 studied the localization of shear stress‐driven deformation under static compression.…”

Section: Discussionmentioning

confidence: 99%

“…57 SB is formed under large shear deformation such as equal-channel angular pressing of aluminum alloy, biaxial loaded NiTi, and cold rolling of high-entropy alloys. [58][59][60] Elibol and Wagner 61 studied the localization of shear stress-driven deformation under static compression. The straight cylinder and inclined cylinder of 6 (introducing the shear stress component) were loaded and then unloaded to observe the strain change.…”

Section: Sb Essence Of the Weamentioning

confidence: 99%

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White etching area damage induced by shear localization in rolling contact fatigue of bearing steel

Chen,

Xie,

et al. 2023

Fatigue Fract Eng Mat Struct

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White etching area (WEA) is a primary damage in rolling contact fatigue (RCF) of bearing steels. In spite of extensive investigations, there is a large discrepancy in the existing mechanisms of WEA formation. We attempt to unify the mechanisms from the perspective of shear localization and plastic damage accumulation based on ductile damage. RCF tests were conducted to generate WEAs with various microstructures and compositions. A thermodynamically consistent model of the ductile damage evolution from an inclusion was established by developing the phase field damage coupled with the crystal elastic‐viscoplastic constitutive relationship under RCF. The model was implemented into the FE framework through a user materials subroutine. The results indicated that the WEA is the shear band resulting from shear localization. The large inhomogeneity and scatter in WEA's microstructure are due to the influence of the crystal orientation. The development and orientation of SBs predicted by the model and the experimental observation of the WEA are in good agreement. The large micro‐shear strain in the WEA provides the driving force for mechanically controlled austenite phase transformation. The shear band center, which has the largest strain and the least stress, is where cracks initiate. This demonstrates that contrary to earlier reports that WEA is induced by previously formed crack faces friction, cracks actually initiate from the interior of the WEA.

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Section: Discussionmentioning

confidence: 99%

Section: Sb Essence Of the Weamentioning

confidence: 99%

White etching area damage induced by shear localization in rolling contact fatigue of bearing steel

Chen,

Xie,

et al. 2023

Fatigue Fract Eng Mat Struct

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“…Recent studies in pristine CrCoNi-based HEA/MEAs have revealed a remarkable resistance to shear localization under dynamic loading in a strain rate of ~10 3 /s ( 18 , 19 ). For example, Yang et al ( 20 ) reported that microstructurally tailored HEA/MEAs displayed a higher strength at high strain rates with twinning acting to suppress shear banding ( 21 ). Yang et al ( 22 ) investigated the dynamic tension of the Fe 40 Mn 20 Cr 20 Ni 20 HEA and showed that strength, tensile ductility, and strain rate sensitivity were all improved at the elevated strain rates.…”

Section: Introductionmentioning

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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“…The SFE of such alloys can even be negative at cryogenic temperature (Zhang et al, 2017), resulting in high propensity for twinning and phase transformation. The transition of the dominant deformation mechanism from dislocation activities to deformation twins (DTs) then leads to better tensile and fracture properties than that at ambient temperature (Gludovatz et al, 2014;Gludovatz et al, 2016;Yang et al, 2018;Shi et al, 2019;Slone et al, 2019;Yang et al, 2020;Han et al, 2021;Ma et al, 2021). Moreover, recent work suggests that tailoring the local chemical order leads to non-uniform and locally tunable SFE in this sort of alloys (Ding et al, 2018), which may facilitate twinning and phase transformation at positions with lower fluctuated SFE.…”

Section: Introductionmentioning

confidence: 99%

Atomistic tensile deformation mechanisms in a CrCoNi medium-entropy alloy with gradient nano-grained structure at cryogenic temperature

2023

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Large-scale molecular dynamics (MD) simulations have been utilized to reveal the atomistic deformation mechanisms of a CrCoNi medium-entropy alloy (MEA) with gradient nano-grained (GNG) structure in the present study. Strong strain hardening was observed in the gradient nano-grained structure at the elasto-plastic transition stage, which could be attributed to the Masing hardening. After yielding, obvious partitioning of tensile strain was detected in the gradient nano-grained structure, which indicates the existence of hetero-deformation induced (HDI) hardening effect and could account for the higher flow stress of the gradient nano-grained structure than that calculated by the rule of mixture from its homogenous nano-grained (NG) structured counterparts. Moreover, partitioning of stacking fault factor (corresponding to the partitioning of tensile strain), which demonstrates the intensity of dislocation behaviors, was also observed in the gradient nano-grained structure. The differences of factors for each grain size area were found to be smaller in the gradient nano-grained structure than those of its homogeneous nano-grained structured counterparts, which indicates the influence of forward stress and back stress on dislocation motion near the zone boundary between the hard zone with smaller grains and the soft zone with larger grains, further verifying the presence of hetero-deformation induced hardening in the gradient nano-grained structure.

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Strain rate dependent shear localization and deformation mechanisms in the CrMnFeCoNi high-entropy alloy with various microstructures

Cited by 39 publications

References 67 publications

White etching area damage induced by shear localization in rolling contact fatigue of bearing steel

White etching area damage induced by shear localization in rolling contact fatigue of bearing steel

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

Atomistic tensile deformation mechanisms in a CrCoNi medium-entropy alloy with gradient nano-grained structure at cryogenic temperature

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