Mechanical properties and deformation mechanisms of a Ni2Co1Fe1V0.5Mo0.2 medium-entropy alloy at elevated temperatures

Jiang, Wei; Yuan, Shengyun; Cao, Yang; Zhang, Yong; Zhao, Yonghao

doi:10.1016/j.actamat.2021.116982

Cited by 51 publications

(11 citation statements)

References 79 publications

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“…Notwithstanding the uncertainty of LCO, a mixture of atoms of diverse sizes results in severe lattice distortion, presenting frequent short-range resistance to dislocation slip, in this manner to maximize the solid solution strengthening effect in MEAs and HEAs (Yeh et al, 2007;Tsai et al, 2013;Li Q.-J. et al, 2019;Jiang et al, 2021c).…”

Section: High Entropy Alloymentioning

confidence: 99%

“…Hitherto, it has been broadly demonstrated that both MEAs and HEAs have extraordinary mechanical properties over a wide temperature range from elevated to cryogenic temperatures (Jo et al, 2017;Yang M. et al, 2019;Gao et al, 2019;Jiang et al, 2021c). For instance, almost all the traditional high-temperature alloys tend to lose both strength and ductility at high temperatures, while equiatomic NbMoTaW and VNbMoTaW refractory HEAs sustain high strength at elevated temperatures more than 1,000 °C (Senkov et al, 2011).…”

Section: High Entropy Alloymentioning

confidence: 99%

“…More recently, LCO is confirmed to have significant influence on the SFE, which results in the increase of the SFE with the increase of the LCO (Ding et al, 2018). Furthermore, LCO affects the critical stress for dislocation slip and dislocation storage capacity in the bulk material, thus in turn affecting strain hardening in single phase MEAs/HEAs (Jiang et al, 2021c). The dislocation slip in MEAs/HEAs has to continuously overcome the activation barriers created by LCO.…”

Section: High Entropy Alloymentioning

confidence: 99%

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Mechanical Properties and Deformation Mechanisms of Heterostructured High-Entropy and Medium-Entropy Alloys: A Review

2022

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Recently, heterostructured (HS) materials, consisting of hard and soft zones with dramatically different strengths, have been developed and received extensive attention because they have been reported to exhibit superior mechanical properties over those predicted by the rule of mixtures. Due to the accumulation of geometrically necessary dislocations during plastic deformation, a back stress is developed in the soft zones to increase the yield strength of HS materials, which also induce forward stress in the hard zones, and a global hetero-deformation induced (HDI) hardening to retain ductility. High-entropy alloys (HEAs) and medium-entropy alloys (MEAs) or multicomponent alloys usually contain three or more principal elements in near-equal atomic ratios and have been widely studied in the world. This review paper first introduces concepts of HS materials and HEAs/MEAs, respectively, and then reviewed emphatically the mechanical properties and deformation mechanisms of HS HEAs/MEAs. Finally, we discuss the prospect for industrial applications of the HS HEAs and MEAs.

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Section: High Entropy Alloymentioning

confidence: 99%

Section: High Entropy Alloymentioning

confidence: 99%

Section: High Entropy Alloymentioning

confidence: 99%

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Mechanical Properties and Deformation Mechanisms of Heterostructured High-Entropy and Medium-Entropy Alloys: A Review

2022

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“…It results in spatially inhomogeneous deformation, thus affecting the surface quality of GH4169 alloy [9][10][11]. The occurrence of the serration phenomenon is a consequence of the competition between dislocation motion and atom diffusion [12][13][14]. Hayes has found that atomic group forming between carbon atoms and dislocations leaded to the plastic instability in the superalloys including Inconel 718 alloy, Inconel 600 alloy and Waspalloy [15].…”

Section: Introductionmentioning

confidence: 99%

A New Strategy for Restraining Dynamic Strain Aging in GH4169 Alloy During Tensile Deformation at High Temperature

Lian

Wang

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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The dynamic strain aging (DSA) behavior was investigated in GH4169 alloy during tensile deforming with electric-pulse current (EPC) at 750 °C. The results show that DSA is restrained in the alloy when deformed with 40 Hz-EPC. The size of γ″ phase inner grains increases obviously and δ phase is facilitated to precipitate on grain boundary in the alloy applied with EPC, due to the promotion effect of EPC on the diffusion and segregation of atoms. Transmission electron microscopy (TEM) results indicate that dislocations can cut through small γ″ precipitate with the size of less than 10 nm, while dislocations can only bypass dislocations when γ″ precipitate grow up over 20 nm. The growth of precipitates consumes large amounts of atoms as well as the velocity of dislocation increase, which makes dislocations difficult to be pinned. Therefore, when γ″ precipitates grow up to a large size more than the critical size of dislocation pinning, DSA is significantly restrained in the alloy after necking deformed with EPC.

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“…We also compare the elevated-temperature strength of our MESS with some conventional Fe-based superalloys and Co-free HEAs/MEAs (Fig. 5b) 2,22,[39][40][41] . Almost no decay in the high yield strength (~800 MPa) of the MESS can be observed at temperatures below 700 o C. This high yield strength well exceeds those of most Fe-based superalloys and Co-free HEAs/MEAs.…”

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confidence: 99%

Discovery of a novel low-cost medium-entropy stainless steel with exceptional mechanical behavior over a wide temperature range

Shen

Wen²,

Cai

et al. 2023

Preprint

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Over 100 years, stainless steels have been extensively used as engineering materials in many areas1-4. However, the strength-ductility trade-off1,3 and insufficient elevated-temperature strength largely hinder their processing and applications. Here, we report a novel Co-free Fe47Cr16Ni26Ti6Al5 medium-entropy stainless steel (MESS) strengthened by high-density coherent L12 nanoprecipitates (NPs). We use a thermodynamic approach to pursuing a large volume fraction of stable L12 NPs in the coarse-grained face-centered-cubic (FCC)-structured matrix of the MESS, which is then readily fabricated through conventional casting and thermomechanical-treatment techniques. The MESS exhibits a high ultimate tensile strength of 1.35 gigapascals (GPa) and a great total elongation of 36% at room temperature (RT), evading the strength-ductility trade-off dilemma in conventional stainless steels. The high strength is mainly due to the chemical- ordering strengthening of high-density coherent L12 NPs. The ductile L12 NPs cooperative with the dynamic refinement of the deformation substructures endow the MESS with an excellent work-hardening ability and a large uniform ductility. Furthermore, the MESS maintains a high yield strength of ~ 0.8 GPa at 700 oC, which is better than many Fe-based superalloys and stainless steels, even comparable to some Ni-based superalloys. The steady-state creep rates at 750 oC are at least two orders of magnitude lower than those of conventional Ni-based superalloys and heat-resistant steels. The excellent creep resistance is achieved via the strong interactions between sliding dislocations and stable L12 NPs at elevated temperatures, which effectively impedes the dislocation movement. The present study has huge potential for designing cost-effective engineering MESSs with excellent mechanical performance for practical applications.

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Mechanical properties and deformation mechanisms of a Ni2Co1Fe1V0.5Mo0.2 medium-entropy alloy at elevated temperatures

Cited by 51 publications

References 79 publications

Mechanical Properties and Deformation Mechanisms of Heterostructured High-Entropy and Medium-Entropy Alloys: A Review

Mechanical Properties and Deformation Mechanisms of Heterostructured High-Entropy and Medium-Entropy Alloys: A Review

A New Strategy for Restraining Dynamic Strain Aging in GH4169 Alloy During Tensile Deformation at High Temperature

Discovery of a novel low-cost medium-entropy stainless steel with exceptional mechanical behavior over a wide temperature range

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