High-temperature mechanical properties of FeCoCrNi high-entropy alloys fabricated via selective laser melting

Lin, Danyang; Xi, Xin; Li, Xiaojie; Hu, Jiang; Zhang, Yankun; Zhao, Lei

doi:10.1016/j.msea.2021.142354

Cited by 45 publications

(14 citation statements)

References 43 publications

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“…Precipitation-strengthened HEAs were therefore designed to break the strength-ductility trade-off of single-phase HEAs. Designing [20,[59][60][61][62][63][64][65] ; eutectic HEAs [68][69][70][71][72][73][74] ; HEAs strengthened by ceramics [75][76][77][78][79][80][81][82][83] ; HEAs strengthened by L1 . FCC: face-centered-cubic; HEAs: high-entropy alloys.…”

Section: Key Issues For Hea Design and Ammentioning

confidence: 99%

“…AM processes, including PBF and DED, have shown many significant advantages in fabricating HEA components compared to traditional processing methods, such as casting, wrought and welding. Until now, many kinds of HEAs have been manufactured by AM methods, including single-phase HEAs (FCC or BCC) [20,[59][60][61][62][63][64][65][66][67] , EHEAs (FCC + BCC) [68][69][70][71][72][73][74] and precipitation-strengthened HEAs [75][76][77][78][79][80][81][82][83][84][85][86][87][88][89] . Figure 3 summarizes the tensile yield strength against the uniform elongation of as-printed HEAs at room temperature.…”

Section: Am Of Heasmentioning

confidence: 99%

“…As-printed FCC HEAs show large ductility but low strength [20,[59][60][61][62][63][64][65] . In addition, for EHEAs manufactured by L-PBF, their tensile properties vary over a wide range, which may be caused by the relative proportions between the FCC and BCC phases and different microstructural features [68][69][70][71][72][73][74] .…”

Section: Am Of Heasmentioning

confidence: 99%

“…Figure 3. Comparison of tensile yield strength and uniform elongation of various HEAs fabricated by AM: FCC HEAs[20,[59][60][61][62][63][64][65] ; eutectic HEAs[68][69][70][71][72][73][74] ; HEAs strengthened by ceramics[75][76][77][78][79][80][81][82][83] ; HEAs strengthened by L1 2…”

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confidence: 99%

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New trends in additive manufacturing of high-entropy alloys and alloy design by machine learning: from single-phase to multiphase systems

Zhou¹,

Zhang²,

Wang³

et al. 2022

J Mater Inf

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Alloys with excellent properties are always in significant demand for meeting the severe conditions of industrial applications. However, the design strategies of traditional alloys based on a single principal element have reached their limits in terms of property optimization. The concept of high-entropy alloys (HEAs) provides a new design strategy based on multicomponent elements, which may overcome the bottleneck problems that exist in traditional alloys. To further maximize the capability of HEAs, a novel additive manufacturing (AM) technique has been utilized to produce HEA components with the desired structures and properties. This review considers a new trend in the AM of HEAs, i.e., from the AM of single-phase HEAs to multiphase HEAs. Although most as-printed single-phase HEAs show superior tensile properties to as-cast ones, their strength is still not satisfactory, especially at elevated temperatures. Thus, multiphase HEAs are developed by introducing hard second phases, such as L12, BCC, carbides, oxides, nitrides, and so on. These phases can be introduced to the matrix using in situ alloying during AM or the subsequent heat treatment. Dislocation strengthening is considered as the main reason for improving the tensile properties of as-printed single-phase HEAs. In contrast, multiple strengthening and toughening mechanisms occur in as-printed multiphase HEAs, which can synergistically enhance their mechanical properties. Furthermore, machine learning provides an effective method to design new alloys with the desired properties and predict the optimal AM parameters for the designed alloys without tedious experiments. The synergistic combination of machine learning and AM will significantly speed up scientific advances and promote industrial applications.

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Section: Key Issues For Hea Design and Ammentioning

confidence: 99%

Section: Am Of Heasmentioning

confidence: 99%

Section: Am Of Heasmentioning

confidence: 99%

mentioning

confidence: 99%

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New trends in additive manufacturing of high-entropy alloys and alloy design by machine learning: from single-phase to multiphase systems

Zhou¹,

Zhang²,

Wang³

et al. 2022

J Mater Inf

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“…High-entropy alloys (HEAs) are potential structural materials that have shown promising structural properties [ 1–7 ] and have been subjected to various manufacturing processes [ 8–13 ], including selective laser melting (SLM) [ 14–17 ]. HEAs fabricated by SLM are shown to possess excellent mechanical strength at room temperature [ 14 , 17–22 ], and there is a limited number of reports on their high temperature mechanical properties [ 14 , 23 ]. In fact, on the subject of high temperature mechanical properties of HEAs in general, several studies have reported a phenomena of hot ductility drop [ 23–33 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of serrated grain boundary on tensile and creep properties of a precipitation strengthened high entropy alloy

Lee

Wang

et al. 2023

Science and Technology of Advanced Materials

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In this study, tensile and creep deformation of a high-entropy alloy processed by selective laser melting (SLM) has been investigated; hot ductility drop was identified at first, and the loss of ductility at elevated temperature was associated with intergranular fracture. By modifying the grain boundary morphology from straight to serration, the hot ductility drop issue has been resolved successfully. The serrated grain boundary could be achieved by reducing the cooling rate of solution heat treatment, which allowed the coarsening of L1 2 structured γ′ precipitates to interfere with mobile grain boundaries, resulting in undulation of the grain boundary morphology. Tensile and creep tests at 650°C were conducted, and serrated grain boundary could render a significant increase in tensile fracture strain and creep rupture life by a factor of 3.5 and 400, respectively. Detailed microstructure analysis has indicated that serrated grain boundary could distribute strains more evenly than that of straight morphology. The underlying mechanism of deformation with grain boundary serration was further demonstrated by molecular dynamic simulation, which has indicated that serrated grain boundaries could reduce local strain concentration and provide resistance against intergranular cracking. This is the first study to tackle the hot ductility drop issue in a high-entropy alloy fabricated by SLM; it can provide a guideline to develop future high-entropy alloys and design post heat treatment for elevated temperature applications.

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Microstructure and atmospheric oxidation behavior of CrCuFeMnNiCo_x high‐entropy alloys fabricated by vacuum hot‐press sintering

Ren

Zhao

Jiang

et al. 2022

Materials & Corrosion

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The CrCuFeMnNiCox high‐entropy alloys (HEAs) were prepared by vacuum hot‐press sintering. The microstructure and atmospheric oxidation behavior at 800°C were studied. The phase structure of the Co0 alloy comprised the Cr‐rich FCC1 major phase, Cu‐rich FCC2 secondary phase, and a small amount of intermetallic compound ρ phase when x = 0. The bulk alloys comprised FCC2 major and FCC1 secondary phases when x ≥ 0.5. The oxidation kinetics curves approximately followed the parabolic law. A high Co content leads to a large oxidation weight gain of the alloys. The oxidation weight gain of the Co0 alloy was the smallest at approximately 4.46 mg cm−2 after atmospheric oxidation for 50 h, while the oxidation weight gain of the Co2.0 alloy was the largest at approximately 5.94 mg cm−2. The Co0 alloys exhibited the best oxidation resistance. Therefore, Co is not beneficial to the improvement of the oxidation properties of the CrCuFeMnNiCox HEAs. The main oxidation products of the HEAs mainly comprised MO, M2O3, M3O4, and (M,Cr)3O4 type metal oxides. The main oxidation mechanism was selective oxidation.

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High-temperature mechanical properties of FeCoCrNi high-entropy alloys fabricated via selective laser melting

Cited by 45 publications

References 43 publications

New trends in additive manufacturing of high-entropy alloys and alloy design by machine learning: from single-phase to multiphase systems

New trends in additive manufacturing of high-entropy alloys and alloy design by machine learning: from single-phase to multiphase systems

Effect of serrated grain boundary on tensile and creep properties of a precipitation strengthened high entropy alloy

Microstructure and atmospheric oxidation behavior of CrCuFeMnNiCo_x high‐entropy alloys fabricated by vacuum hot‐press sintering

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High-temperature mechanical properties of FeCoCrNi high-entropy alloys fabricated via selective laser melting

Cited by 45 publications

References 43 publications

New trends in additive manufacturing of high-entropy alloys and alloy design by machine learning: from single-phase to multiphase systems

New trends in additive manufacturing of high-entropy alloys and alloy design by machine learning: from single-phase to multiphase systems

Effect of serrated grain boundary on tensile and creep properties of a precipitation strengthened high entropy alloy

Microstructure and atmospheric oxidation behavior of CrCuFeMnNiCox high‐entropy alloys fabricated by vacuum hot‐press sintering

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Microstructure and atmospheric oxidation behavior of CrCuFeMnNiCo_x high‐entropy alloys fabricated by vacuum hot‐press sintering