Constitutive modeling of deformation behavior of high-entropy alloys with face-centered cubic crystal structure

Jang, Miso; Ahn, Dong-Hyun; Moon, Jongun; Bae, Jae Wung; Yim, Dami; Yeh, Jien‐Wei; Estrin, Yuri; Kim, Hyoung Seop

doi:10.1080/21663831.2017.1292325

Cited by 49 publications

(5 citation statements)

References 36 publications

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“…The values of G = 81 GPa and b = 0.254 nm as reported in Ref. [53] for the CoCr-FeNiMn equiatomic alloy were used. After converting the calculated strengthening Δσ to HV, we have obtained ΔHV ≈ 100 HV.…”

Section: Discussionmentioning

confidence: 99%

Laser beam welding of a CoCrFeNiMn-type high entropy alloy produced by self-propagating high-temperature synthesis

et al. 2018

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Section: Discussionmentioning

confidence: 99%

Laser beam welding of a CoCrFeNiMn-type high entropy alloy produced by self-propagating high-temperature synthesis

et al. 2018

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“…This process is particularly relevant during initial stages of deformation when the number of twins and the density of high-angle twin boundaries are the highest [13]. It is already established that mechanical twinning can occur in the CoCrFeNiMn alloy during plastic deformation at room temperature, however, the extent and the role of twinning in microstructure development remains quite debatable [11,12,27,28].…”

Section: Discussionmentioning

confidence: 99%

“…Here the "grain" term is used to denote the crystallites bordered by high (≥ 15 • ) angle boundaries. The evolution of grain size during deformation was evaluated using equation (1); the input parameters for calculation were: K y = 0.494 MPa m 1/2 and σ 0 = 125 MPa (both parameters were taken from [6]), M = 3, α = 0.2, G = 81 GPa [35], b = 2.54 × 10 −10 m [28]. Estimated dislocation densities and yield stress are tabulated in Table 2.…”

Section: Discussionmentioning

confidence: 99%

Evolution of Microstructure and Mechanical Properties of a CoCrFeMnNi High-Entropy Alloy during High-Pressure Torsion at Room and Cryogenic Temperatures

Zherebtsov

Stepanov

Ivanisenko

et al. 2018

Metals

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High-pressure torsion (HPT) is applied to a face-centered cubic CoCrFeMnNi high-entropy alloy at 293 and 77 K. Processing by HPT at 293 K produced a nanostructure consisted of (sub)grains of~50 nm after a rotation for 180 • . The microstructure evolution is associated with intensive deformation-induced twinning, and substructure development resulted in a gradual microstructure refinement. Deformation at 77 K produces non-uniform structure composed of twinned and fragmented areas with higher dislocation density then after deformation at room temperature. The yield strength of the alloy increases with the angle of rotation at HPT at room temperature at the cost of reduced ductility. Cryogenic deformation results in higher strength in comparison with the room temperature HPT. The contribution of Hall-Petch hardening and substructure hardening in the strength of the alloy in different conditions is discussed.

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“…The encouraging properties of the alloy at cryogenic temperature were mostly attributed to pronounced deformation nano-twinning promoting high strain hardening capacity [ 5 , 9 , 25 ]. However, there are still different opinions on relative contributions of dislocation slip and twinning during plastic deformation at room temperature [ 9 , 26 , 27 , 28 , 29 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties Evolution of the Al, C-Containing CoCrFeNiMn-Type High-Entropy Alloy during Cold Rolling

et al. 2017

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The effect of cold rolling on the microstructure and mechanical properties of an Al- and C-containing CoCrFeNiMn-type high-entropy alloy was reported. The alloy with a chemical composition (at %) of (20–23) Co, Cr, Fe, and Ni; 8.82 Mn; 3.37 Al; and 0.69 C was produced by self-propagating high-temperature synthesis with subsequent induction. In the initial as-cast condition the alloy had an face centered cubic single-phase coarse-grained structure. Microstructure evolution was mostly associated with either planar dislocation glide at relatively low deformation during rolling (up to 20%) or deformation twinning and shear banding at higher strain. After 80% reduction, a heavily deformed twinned/subgrained structure was observed. A comparison with the equiatomic CoCrFeNiMn alloy revealed higher dislocation density at all stages of cold rolling and later onset of deformation twinning that was attributed to a stacking fault energy increase in the program alloy; this assumption was confirmed by calculations. In the initial as-cast condition the alloy had low yield strength of 210 MPa with yet very high uniform elongation of 74%. After 80% rolling, yield strength approached 1310 MPa while uniform elongation decreased to 1.3%. Substructure strengthening was found to be dominated at low rolling reductions (<40%), while grain (twin) boundary strengthening prevailed at higher strains.

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Constitutive modeling of deformation behavior of high-entropy alloys with face-centered cubic crystal structure

Cited by 49 publications

References 36 publications

Laser beam welding of a CoCrFeNiMn-type high entropy alloy produced by self-propagating high-temperature synthesis

Laser beam welding of a CoCrFeNiMn-type high entropy alloy produced by self-propagating high-temperature synthesis

Evolution of Microstructure and Mechanical Properties of a CoCrFeMnNi High-Entropy Alloy during High-Pressure Torsion at Room and Cryogenic Temperatures

Microstructure and Mechanical Properties Evolution of the Al, C-Containing CoCrFeNiMn-Type High-Entropy Alloy during Cold Rolling

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