Structure and mechanical properties of a FeCoCrNi high-entropy alloy fabricated via selective laser melting

Lin, Danyang; Han, Yongdian; Zhang, Yankun; Jing, Hongyang; Zhao, Lei; Minami, Fumiyoshi

doi:10.1016/j.intermet.2020.106963

Cited by 59 publications

(7 citation statements)

References 44 publications

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“…Synthesis of CoCrFeMnNi alloys is common by the AM process due to their nature with a ductile fcc structure as matrix, which provides stable printability [19][20][21]. A CrFeCoNi alloy also demonstrates the same or even better properties than the five-component alloy [22][23][24][25]. The four-component system is actively explored for composition modification by the AM process [26,27].…”

Section: Introductionmentioning

confidence: 99%

Phase and structural changes during heat treatment of additive manufactured CrFeCoNi high-entropy alloy

Kuzminova

Kudryavtsev

Han

et al. 2021

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Phase and structural changes during heat treatment of additive manufactured CrFeCoNi high-entropy alloy

Kuzminova

Kudryavtsev

Han

et al. 2021

Journal of Alloys and Compounds

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“…Even though VED to some extent can be an effective criterion for optimizing the LPBF process, due to the complexity of LPBF, other influential processing parameters should also be considered, e.g., the diameter of the laser beam and the scanning strategy. Lin et al [109] fabricated CoCrNiFe MPEAs using different combinations of LPBF parameters with the same VED of 170 J/mm 3 (Fig. 2a-d).…”

Section: Key Microstructure Features and Characteristics In Am Mpeas ...mentioning

confidence: 99%

“…The AM processing parameters play a key role in controlling the microstructure of MPEAs and, hence, their mechanical properties. Lin et al [109] showed that highly dense (a relative density of 99.71%) FeCoCrNi fabricated by optimized LPBF parameters exhibits superior properties with a yield strength of 600 MPa, ultimate tensile strength of 720 MPa and elongation of 31.85% (Fig. 15b).…”

Section: Mechanical Behavior Of Am Mpeasmentioning

confidence: 99%

Review: Multi-principal element alloys by additive manufacturing

Ferry

Kruzic

et al. 2022

J Mater Sci

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Multi-principal element alloys (MPEAs) have attracted rapidly growing attention from both research institutions and industry due to their unique microstructures and outstanding physical and chemical properties. However, the fabrication of MPEAs with desired microstructures and properties using conventional manufacturing techniques (e.g., casting) is still challenging. With the recent emergence of additive manufacturing (AM) techniques, the fabrication of MPEAs with locally tailorable microstructures and excellent mechanical properties has become possible. Therefore, it is of paramount importance to understand the key aspects of the AM processes that influence the microstructural features of AM fabricated MPEAs including porosity, anisotropy, and heterogeneity, as well as the corresponding impact on the properties. As such, this review will first present the state-of-the-art in existing AM techniques to process MPEAs. This is followed by a discussion of the microstructural features, mechanisms of microstructural evolution, and the mechanical properties of the AM fabricated MPEAs. Finally, the current challenges and future research directions are summarized with the aim to promote the further development and implementation of AM for processing MPEAs for future industrial applications.

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“…Figure 1 summarizes the room-temperature tensile properties of HEAs classified based on their crystal structures. HEAs with a single-phase FCC structure possess superior tensile ductility but suffer from poor yield strength [13][14][15][16][17][18][19][20][21][22][23][24] . To improve the tensile strength of single-phase FCC HEAs, the hard BCC phase is introduced to the FCC system by adding Al, Cu, Ti, and so on [9,22,23,[25][26][27][28] .…”

Section: High-entropy Alloysmentioning

confidence: 99%

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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Structure and mechanical properties of a FeCoCrNi high-entropy alloy fabricated via selective laser melting

Cited by 59 publications

References 44 publications

Phase and structural changes during heat treatment of additive manufactured CrFeCoNi high-entropy alloy

Phase and structural changes during heat treatment of additive manufactured CrFeCoNi high-entropy alloy

Review: Multi-principal element alloys by additive manufacturing

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

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