Solute segregation effect on grain boundary migration and Hall–Petch relationship in CrMnFeCoNi high-entropy alloy

Liu, G.; Lü, Dan; Liu, Xinwang; Liu, F. C.; Yang, Qing; Du, Hui; Hu, Qiaodan; Zhao, Fan

doi:10.1080/02670836.2019.1570679

Cited by 36 publications

(22 citation statements)

References 52 publications

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“…Earlier, Liu et al [24] demonstrated a Hall-Petch relationship between the Vickers hardness and the grain size for equiatomic CoCrFeMnNi at 293 K and obtained a k value of 677 MPa•µm −1/2 , which is higher than the values obtained by Liu et al [20] of 394 MPa•µm −1/2 , Otto et al [18] of 494 MPa•µm −1/2 and Sun et al [19] of 586 MPa•µm −1/2 . The higher value may reflect that the Vickers hardness represents the flow stress at 8-10% strain rather than σ y .…”

Section: T (K)mentioning

confidence: 77%

“…Recently, Liu et al [20] determined the Hall-Petch behavior of equiatomic single-phase f.c.c. CoCrFeMnNi at room temperature only.…”

Section: Carbon Doping-cocrfemnnimentioning

confidence: 99%

“…Values of the Hall-Petch parameters at different temperatures for CoCrFeMnNi. From Otto et al [18], Sun et al [19], and Liu et al [20].…”

Section: Carbon Doping-cocrfemnnimentioning

confidence: 99%

“…[20] The WHR calculated from data in Figure 6 in Liu et al [20] showed that the room temperature WHR was independent of grain size at 1100-1166 MPa.…”

Section: T (K)mentioning

confidence: 99%

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Interstitials in f.c.c. High Entropy Alloys

Baker

2020

Metals

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The effects of interstitials on the mechanical properties of single-phase f.c.c. high entropy alloys (HEAs) have been assessed based on a review of the literature. It is found that in nearly all studies, carbon increases the yield strength, in some cases by more than in traditional alloys. This suggests that carbon can be an excellent way to strengthen HEAs. This strength increase is related to the lattice expansion from the carbon. The effects on other mechanical behavior is mixed. Most studies show a slight reduction in ductility due to carbon, but a few show increases in ductility accompanying the yield strength increase. Similarly, some studies show little or modest increases in work-hardening rate (WHR) due to carbon, whereas a few show a substantial increase. These latter effects are due to changes in deformation mode. For both undoped and carbon doped CoCrFeMnNi, the room temperature ductility decreases slightly with decreasing grain size until ~2–5 µm, below which the ductility appears to decrease rapidly. The room temperature WHR also appears to decrease with decreasing grain size in both undoped and carbon-doped CoCrFeMnNi and in nitrogen-doped medium entropy alloy NiCoCr, and, at least for the undoped HEA, shows a sharp decrease at grain sizes <2 µm. Interestingly, carbon has been shown to almost double the Hall–Petch strengthening in CoCrFeMnNi, suggesting the segregation of carbon to the grain boundaries. There have been few studies on the effects of other interstitials such as boron, nitrogen and hydrogen. It is clear that more research is needed on interstitials both to understand their effects on mechanical properties and to optimize their use.

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Section: T (K)mentioning

confidence: 77%

“…Recently, Liu et al [20] determined the Hall-Petch behavior of equiatomic single-phase f.c.c. CoCrFeMnNi at room temperature only.…”

Section: Carbon Doping-cocrfemnnimentioning

confidence: 99%

“…Values of the Hall-Petch parameters at different temperatures for CoCrFeMnNi. From Otto et al [18], Sun et al [19], and Liu et al [20].…”

Section: Carbon Doping-cocrfemnnimentioning

confidence: 99%

“…[20] The WHR calculated from data in Figure 6 in Liu et al [20] showed that the room temperature WHR was independent of grain size at 1100-1166 MPa.…”

Section: T (K)mentioning

confidence: 99%

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Interstitials in f.c.c. High Entropy Alloys

Baker

2020

Metals

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“…Currently, the relationship between porosity and strength of porous materials can be simulated by the Barsen equation [17]. The Hall-Petch equation can be used to reveal the relation between the strength or hardness and the grain size of single phase material [18][19][20] or composite material [21][22][23]. In this work, a series of porous Ti 3 SiC 2 compounds with different pore sizes and approximately the same porosities and phase purities were prepared by the reactive synthesis of elemental powders through a pressure less sintering process.…”

Section: Introductionmentioning

confidence: 99%

Reactively Synthesized Porous Ti3SiC2 Compound and Its Mechanical Properties with Different Apertures

et al. 2020

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Reactively synthesized porous Ti3SiC2 with different pore sizes was prepared using TiH2, Si and graphite powders as starting materials. The effect of pore size on the flexural stress–strain relationship, bending strength and flexural elastic modulus were investigated. The results show that the synthesized porous Ti3SiC2 intermetallic compounds have a characteristic of a high-purity MAX phase with typical laminate microstructure. When the average pore size decreases from 21.8 to 2.1 μm, the volume content of Ti3SiC2 phase ranges from 96.9% to 99.6%, and the porosity is in the range of 49.9% to 54.1%. The flexural stress–strain curves of porous Ti3SiC2 show a characteristic of two stages of elastic deformation and fracture. The flexural modulus is in the range of 13 to 70 GPa, which increases rapidly with further decrease of the pore size. A relation similar to the Hall–Petch equation between the mechanical property and the pore size was investigated for the porous material.

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Microstructure and Mechanical Properties of Face‐Centered‐Cubic‐Based Cr‐Free Equiatomic High‐Entropy Alloys

Liu

Zhang

et al. 2020

Adv Eng Mater

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High‐entropy alloys (HEAs) with face‐centered‐cubic (FCC) structures, e.g., the typical CrMnFeCoNi HEA, have a strong tendency to precipitate brittle sigma phases, as Cr is a strong sigma stabilizer. To develop HEAs with alleviated concerns of sigma phases, Cu for Cr in the Cr‐Mn‐Fe‐Co‐Ni HEA system is substituted to form a Mn‐Fe‐Co‐Ni‐Cu system. The quinary alloy and its quaternary subsets are investigated all in as‐cast state. Microstructure evolution, phase constituent, and tensile properties at room temperature are studied. The HEAs have multi‐phase FCC structures with slightly different lattice constants and spherical Cu‐rich particles are observed in most systems. All alloys exhibit dendrite‐like morphology with Cu segregation in interdendritic regions due to the solute partitioning. The investigated HEAs show good strengths, large elongations, and work hardening capability. The strengths are attributed to combined mechanisms, especially the precipitation strengthening by Cu‐rich particles. The findings provide some model HEA systems for further usefully guiding design in the widely compositional space of Cr‐free HEAs.

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Solute segregation effect on grain boundary migration and Hall–Petch relationship in CrMnFeCoNi high-entropy alloy

Cited by 36 publications

References 52 publications

Interstitials in f.c.c. High Entropy Alloys

Interstitials in f.c.c. High Entropy Alloys

Reactively Synthesized Porous Ti3SiC2 Compound and Its Mechanical Properties with Different Apertures

Microstructure and Mechanical Properties of Face‐Centered‐Cubic‐Based Cr‐Free Equiatomic High‐Entropy Alloys

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