Effects of carbon and molybdenum on the nanostructural evolution and strength/ductility trade-off in Fe40Mn40Co10Cr10 high-entropy alloys

Rizi, Mohsen Saboktakin; Minouei, Hossein; Lee, Byung Ju; Toroghinejad, Mohammad Reza; Hong, Sun Ig

doi:10.1016/j.jallcom.2022.165108

Cited by 47 publications

(6 citation statements)

References 79 publications

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“…High-angle grain boundaries (HAGBs) with misorientation angles of >15° and twin boundaries (TBs) are shown as blue and red lines, respectively. The MAD of the homogenized samples revealed a strong peak at a misorientation angle of 60°, which is related to the annealing TBs [ 1 , 2 ]. The fraction of ∑3 twin boundaries was estimated to be 42% and 56% for FeMn 40 Co 10 Cr 10 C 0.5 and FeMn 40 Co 10 Cr 10 C 0.5 Mo 1.7 , respectively, suggesting that the addition of Mo increases the fraction of annealed TBs.…”

Section: Resultsmentioning

confidence: 99%

“…Different factors, including low SFE, short-range ordering, and lattice friction stress, have been reported to enhance the planar slip of dislocations [ 1 , 2 ]. In Fe 38.3 Mn 40 Co 10 Cr 10 C 0.5 Mo 1.7 , three-dimensional dislocation movement and cell formation were prevented because of the high friction stress and low SFE of the alloy caused by Mo and consequently, Taylor lattice was formed.…”

Section: Resultsmentioning

confidence: 99%

“…Among the different strengthening mechanisms, interstitial and/or substitutional solid-solution strengthening with thermomechanical processing is an effective approach for controlling the microstructure evolution and significantly improving the mechanical properties of HEAs at room and cryogenic temperatures [ 1 , 2 ]. Ko and Hong investigated the effect of carbon on the mechanical properties and microstructure of CoCrFeMnNi HEA [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

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Effects of molybdenum on hot deformation behavior and microstructural evolution of Fe ₄₀ Mn ₄₀ Co ₁₀ Cr ₁₀ C _0.5 high entropy alloys

Ebrahimian

Rizi

Hong

et al. 2023

Science and Technology of Advanced Materials

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The remarkable properties of high-entropy alloys (HEAs) have resulted in their increased research interest and prompted the use of various strategies to enhance their mechanical properties. In this study, the effects of Mo on the hot compressive deformation behavior of carbon-containing FeMn 40 Co 10 Cr 10 HEAs in the temperature range of 800–1000°C and strain rate of 0.001–0.1 s −1 was investigated. The microstructural evolutilon and phase structure were characterized by X-ray diffraction and electron backscattered diffraction. The effects of strain, strain rate, and deformation temperature on the thermally activated deformation restoration process of the Fe 39.5 Mn 40 Co 10 Cr 10 C 0.5 and Fe 38.3 Mn 40 Co 10 Cr 10 C 0.5 Mo 1.7 HEAs during hot compression were represented by the Zener–Hollomon parameter. Dynamic recrystallization was initiated at 800°C with the strain rate of 0.001–0.1 s −1 . The precipitation of the M 23 C 6 carbide along the grain boundaries and within the matrix exerted a strong pinning effect on the grain/subgrain boundaries and promoted dynamic recrystallization through the particle-stimulated nucleation of recrystallization. Moreover, the addition of Mo to the Fe 39.5 Mn 40 Co 10 Cr 10 C 0.5 HEA changed the dynamic recrystallization mechanism by reducing the stacking fault energy and enhancing the reverse phase transformation. The heterogeneous microstructure composed of ultrafine, fine, and larger grains in the Fe 38.3 Mn 40 Co 10 Cr 10 C 0.5 Mo 1.7 HEA could be obtained by the nucleation of new recrystallized grains at large deformed grain boundaries adjacent to the first necklace structures and shear bands.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of molybdenum on hot deformation behavior and microstructural evolution of Fe ₄₀ Mn ₄₀ Co ₁₀ Cr ₁₀ C _0.5 high entropy alloys

Ebrahimian

Rizi

Hong

et al. 2023

Science and Technology of Advanced Materials

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“…Due to its high entropy, this multi-principal element alloy tends to form a simple solid solution with face-centered cubic (FCC) structure, body-centered cubic (BCC) structure, or hexagonal closed-packed (HCP) structure [5]. The solid-solution hardening caused by multi-elements with large lattice distortion in a simple solid-solution structure makes it possible to obtain high strength/hardness and desired toughness [6][7][8][9][10][11][12]. In addition to the high entropy and lattice distortion effects, there are two other beneficial core effects for HEA, called sluggish diffusion effect and cocktail effect [13].…”

Section: Introductionmentioning

confidence: 99%

Achieving a Combination of Higher Strength and Higher Ductility for Enhanced Wear Resistance of AlCrFeNiTi0.5 High-Entropy Alloy by Mo Addition

Yuan

Diao

et al. 2022

Metals

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AlCrFeNiTi0.5Mox (x = 0, 0.1, 0.2, 0.3 and 0.4) high-entropy alloys (HEAs) were prepared by arc melting and investigated in terms of microstructure, mechanical properties, and wear resistance. All the as-cast HEAs are composed of one disordered BCC phase (BCC) and one ordered BCC (B2) phase. The added Mo acted as a solid solute in the BCC phase. When Mo molar ratio was more than 0.3, a new type or modified BCC phase formed at the grain boundary, which was enriched with both Mo and Ti. Strength, hardness, and ductility of AlCrFeNiTi0.5 were markedly increased with the Mo addition. The increase in hardness was caused by Mo-solute strengthened disordered BCC phase and precipitation-strengthening by precipitation of hard (Mo, Ti)-rich BCC phase at grain boundaries. The improved ductility was largely attributed to reduced interfacial lattice mismatch between the BCC and B2 phase. The Mo-free AlCrFeNiTi0.5 showed the highest wear loss, about 2.5 times as large as that of AlCrFeNiTi0.5Mo0.4 alloy, which possessed the highest hardness, yield strength, maximum strength, and ductility.

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“…By adding refractory elements, such as Ti, Nb, Mo, W, or V, increased high-temperature wear resistance can be achieved and existing alloying concepts can be replaced [22][23][24]. In particular, the element Mo is also known to form hierarchical microstructures [25], improving the mechanical properties and could therefore be promising for highly wearresistant applications. Compared to currently used high-temperature materials, such as Inconel 718, HEAs alloyed with the refractory element Nb are characterized by a less pronounced decrease in hardness at temperatures above 700 • C [22].…”

Section: Introductionmentioning

confidence: 99%

Nb and Mo Influencing the High-Temperature Wear Behavior of HVOF-Sprayed High-Entropy Alloy Coatings

2022

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To qualify high-entropy alloys (HEAs) as resource-saving and high-temperature wear-resistant coating materials, high-velocity oxygen fuel (HVOF) coatings produced from the inert gas-atomized powder of Al0.3CrFeCoNi, Al0.3CrFeCoNiNb0.5 and Al0.3CrFeCoNiMo0.75 were investigated in reciprocating wear tests at temperatures at 25, 500, 700 and 900 °C. In addition to the high-temperature wear tests, the microstructure and chemical composition of the three HEAs were analyzed using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). In particular, HVOF coatings are characterized by high hardness (Vickers hardness HV0.1) and low porosity, which were also determined. After high-temperature wear tests, the wear depth was measured using laser scanning microscopy (LSM). It was found that adding Nb and Mo to Al0.3CrFeCoNi significantly reduces the wear depth with increasing temperature. The wear mechanisms change from abrasive wear and delamination (25 °C and 500 °C) to a combination of (abrasion), delamination, adhesion and oxidative wear. Thereby, oxidative wear will be the primary mechanism at 900 °C for all the HVOF coatings investigated. The most important finding is that the adhesion of the oxide layer formed is improved by adding Nb and Mo, resulting in significantly reduced wear depth at 900 °C.

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Effects of carbon and molybdenum on the nanostructural evolution and strength/ductility trade-off in Fe40Mn40Co10Cr10 high-entropy alloys

Cited by 47 publications

References 79 publications

Effects of molybdenum on hot deformation behavior and microstructural evolution of Fe ₄₀ Mn ₄₀ Co ₁₀ Cr ₁₀ C _0.5 high entropy alloys

Effects of molybdenum on hot deformation behavior and microstructural evolution of Fe ₄₀ Mn ₄₀ Co ₁₀ Cr ₁₀ C _0.5 high entropy alloys

Achieving a Combination of Higher Strength and Higher Ductility for Enhanced Wear Resistance of AlCrFeNiTi0.5 High-Entropy Alloy by Mo Addition

Nb and Mo Influencing the High-Temperature Wear Behavior of HVOF-Sprayed High-Entropy Alloy Coatings

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Effects of carbon and molybdenum on the nanostructural evolution and strength/ductility trade-off in Fe40Mn40Co10Cr10 high-entropy alloys

Cited by 47 publications

References 79 publications

Effects of molybdenum on hot deformation behavior and microstructural evolution of Fe 40 Mn 40 Co 10 Cr 10 C 0.5 high entropy alloys

Effects of molybdenum on hot deformation behavior and microstructural evolution of Fe 40 Mn 40 Co 10 Cr 10 C 0.5 high entropy alloys

Achieving a Combination of Higher Strength and Higher Ductility for Enhanced Wear Resistance of AlCrFeNiTi0.5 High-Entropy Alloy by Mo Addition

Nb and Mo Influencing the High-Temperature Wear Behavior of HVOF-Sprayed High-Entropy Alloy Coatings

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Effects of molybdenum on hot deformation behavior and microstructural evolution of Fe ₄₀ Mn ₄₀ Co ₁₀ Cr ₁₀ C _0.5 high entropy alloys

Effects of molybdenum on hot deformation behavior and microstructural evolution of Fe ₄₀ Mn ₄₀ Co ₁₀ Cr ₁₀ C _0.5 high entropy alloys