Comparison of dislocation density, twin fault probability, and stacking fault energy between CrCoNi and CrCoNiFe medium entropy alloys deformed at 293 and 140K

Woo, Wanchuck; Naeem, Muhammad; Jeong, Jae-Suk; Lee, Cheol-Min; Harjo, Stefanus; Kawasaki, Takuro; He, Haiyan; Wang, Xun-Li

doi:10.1016/j.msea.2020.139224

Cited by 54 publications

(9 citation statements)

References 27 publications

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“…The high YS of the as-built state alloy was derived from the combined effects of lattice friction stress, boundary strengthening and dislocation strengthening [79] . Interestingly, the SFE of the CoCrNi alloy prepared by AM was lower than the as-cast one [38] . Niu et al [80] studied the effect of process parameters on the alloy and found that the sample density exhibited a non-monotonic relationship with the volume energy density (VED).…”

Section: Preparation Methodsmentioning

confidence: 89%

“…(1) Additive manufacturing (AM): The alloys discussed above were as cast. In recent years, AM technology has been gradually used to prepare HEAs [38,[79][80][81] . AM technology is more efficient and versatile and can directly prepare parts with complex structures.…”

Section: Preparation Methodsmentioning

confidence: 99%

“…Since 2018, the number of reports on the CoCrNi alloy has increased dramatically. The understanding of various aspects of the alloy has been gradually deepened, including lattice distortion (LD) [34][35][36] , stacking fault energy (SFE) [37][38][39][40] and the critical shear stress of dislocations and twins [41] . The dislocation, twinning, phase transformation and even texture during deformation have been systematically studied [42][43][44][45][46][47] .…”

Section: Development Of Cocrni Alloymentioning

confidence: 99%

“…Figure 7. Comparison of tensile response of alloys prepared by different preparation methods[27,28,38,39,79,82,83] …”

mentioning

confidence: 99%

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A critical review of the mechanical properties of CoCrNi-based medium-entropy alloys

Xu¹,

Wang²,

Li³

et al. 2022

Microstructures

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The CoCrFeMnNi alloy is one of the most notable first-generation high-entropy alloys and is also known as a Cantor alloy. This alloy was first proposed in 2004 and shows promising performance at cryogenic temperatures (CTs). Subsequent research has indicated that the equiatomic ternary CoCrNi medium-entropy alloy (MEA), as a subset of the Cantor alloy family, has better mechanical properties than the CoCrFeMnNi alloy. Interestingly, both the strength and ductility of the CoCrNi MEA are higher at CTs than at room temperature. CoCrNi-based alloys have attracted considerable attention in the metallic materials community and it is therefore important to generalize and summarize the latest progress in CoCrNi-based MEA research. The present review initially briefly introduces the discovery of the CoCrNi MEA. Subsequently, its tensile response and deformation mechanisms are summarized. In particular, the effects of parameters, such as critical resolved shear stress, stacking fault energy and short-range ordering, on the deformation behavior are discussed in detail. The methods for strengthening the CoCrNi MEA are then reviewed and divided into two categories, namely, modifying microstructures and adjusting chemical compositions. In addition, the mechanical performance of CoCrNi-based MEAs, including their dynamic shear properties, creep behavior and fracture toughness, is also deliberated. Finally, the development prospects of CoCrNi-based MEAs are proposed.

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Section: Preparation Methodsmentioning

confidence: 89%

Section: Preparation Methodsmentioning

confidence: 99%

Section: Development Of Cocrni Alloymentioning

confidence: 99%

“…Figure 7. Comparison of tensile response of alloys prepared by different preparation methods[27,28,38,39,79,82,83] …”

mentioning

confidence: 99%

See 2 more Smart Citations

A critical review of the mechanical properties of CoCrNi-based medium-entropy alloys

Xu¹,

Wang²,

Li³

et al. 2022

Microstructures

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“…Note that in NC materials with crystallite sizes less than 50-60 nm, the crystallite sizes practically coincide with the grain size [47]. In addition, a certain contribution to the value of the yield strength is made by the concentration of stacking faults [48], which is also a maximum for the alloy with 1 at. % C (Table 2).…”

Section: Effect Of Test Temperaturementioning

confidence: 99%

Structure and low-temperature micromechanical properties of as-cast and SPD-processed high-entropy Co25−xCr25Fe25Ni25Cx alloys

Rusakova

Fomenko

Huang

et al. 2022

Low Temperature Physics

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The effect of carbon additions on the structure and mechanical properties of high-entropy alloys Co25− xCr25Fe25Ni25C x ( x = 0, 1, 3, at. %) in two structural states, as-cast coarse-grained (CG) samples and nanocrystalline (NC) obtained by severe plastic deformation (SPD), was studied. The SPD was performed by high-pressure torsion at room temperature. The mechanical properties were investigated by microindentation in the temperature range of T = 77−300 K. It was found that in the as-cast state, all alloys had a dendritic microstructure and an inhomogeneous distribution of elements. At x = 0 and x = 1, the dendrites were enriched in iron and nickel, and the interdendrite regions were enriched in chromium. At x = 3, in the interdendrite regions, a eutectic consisting of a multicomponent matrix and fine eutectic dendrites of M7C3 carbide, where M is predominantly chromium, was formed. The main phase in alloys had an fcc lattice, while the solubility of carbon in it was about 1 at. %. SPD led to the effective refinement of the microstructure (the size of the coherent scattering regions was about 30−50 nm), to an increase in the dislocation density up to (1−1.5)⋅1015 m−2 and to an increase in the concentration of stacking faults. The microhardness of CG alloys at room temperature increased monotonically with increasing carbon concentration, while in NC alloys the maximum microhardness HV was achieved at 1 at. % of carbon. The reason for this anomalous behavior of the microhardness of NC alloys is an increase in the grain size and a decrease in the dislocation density in the alloy with x = 3 compared to the alloy with x = 1. As the temperature decreased from room temperature to the temperature of liquid nitrogen, the microhardness of CG and NC alloys increased by about 1.5−1.7 and 1.2−1.5 times, respectively, which indicates the thermally-activated nature of plastic deformation under the indenter. The results obtained indicate that the main role in the hardening of the CG alloys Co25− xCr25Fe25Ni25C x is due to solid solution and dispersion hardening, while in NC alloys it is hardening due to a decrease in the grain size (according to the Hall-Petch relation) and an increase in the dislocation density (according to the Taylor relation).

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High-entropy alloys: a review of mechanical properties and deformation mechanisms at cryogenic temperatures

et al. 2022

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Comparison of dislocation density, twin fault probability, and stacking fault energy between CrCoNi and CrCoNiFe medium entropy alloys deformed at 293 and 140K

Cited by 54 publications

References 27 publications

A critical review of the mechanical properties of CoCrNi-based medium-entropy alloys

A critical review of the mechanical properties of CoCrNi-based medium-entropy alloys

Structure and low-temperature micromechanical properties of as-cast and SPD-processed high-entropy Co25−xCr25Fe25Ni25Cx alloys

High-entropy alloys: a review of mechanical properties and deformation mechanisms at cryogenic temperatures

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