Competition between continuous and discontinuous precipitation in L12-strengthened high-entropy alloys

Fang, Jie; Liu, W.H.; Luan, Junhua; Yang, Tingting; Wu, Yan; Fu, Ming; Jiao, Zengbao

doi:10.1016/j.intermet.2022.107655

Cited by 27 publications

(3 citation statements)

References 31 publications

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“…On contrary, the annealing at a higher temperature of 850 °C for 15 h leads to an increase in microhardness only to HV0.05 = 350, which indicates a precipitation hardening effect. Such an increase in the microhardness values of the studied CCA subjected to appropriate heat treatments is associated with the formation of the strengthening L12 precipitates in the FCC(A1) matrix [16][17][18]. There is a potential that such precipitation-strengthened CCAs with L12 may be utilized in high-temperature applications, especially since the strengthening ordered intermetallic phases are largely the same as those in present-generation high-temperature nickel-based superalloys alloys [19].…”

Section: Nanohardness and Vickers Microhardnessmentioning

confidence: 96%

Design, processing and properties of precipitation-hardenable complex concentrated alloy

ULYBKINA,

LAPIN,

KAMYSHNYKOVA

2023

METAL Conference Proeedings

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Complex concentrated alloy (CCA) with nominal composition (CoCrFeNi)92.5Al3Ti4.5 (in at.%) was prepared by vacuum induction melting in a ceramic crucible and tilt cast into the cylindrical ceramic mould. The alloying elements such as Al and Ti were added to the basic quaternary CoCrFeNi system to promote the formation of L12 phase in the FCC (face -centered cubic) matrix during heat treatments. The as-cast ingot was subjected to solid solution annealing, which was followed by free hot forging to refine the coarse columnar grain structure of the as-cast ingot. The forged alloy was subjected to annealing at 800 and 850 °C for 15 h. The properties of the CCA were studied with light microscopy (LM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), nanohardness and microhardness measurements. The CCA solidifies through FCC(A1) primary solidification phase. The as-cast microstructure of the alloy consists of columnar dendritic grains growing from the surface towards the center of the cylindrical ingot. Solution annealing leads to a full chemical homogenization of the alloy and the formation of single-phase coarse columnar grains. Forging leads to the recrystallisation process and formation of equiaxed grains in the forgings. The annealing at the temperatures of 800 and 850 °C leads to significant hardening of the studied alloy, which is associated with the precipitation of L12 particles in the FCC(A1) matrix.

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Section: Nanohardness and Vickers Microhardnessmentioning

confidence: 96%

Design, processing and properties of precipitation-hardenable complex concentrated alloy

ULYBKINA,

LAPIN,

KAMYSHNYKOVA

2023

METAL Conference Proeedings

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“…Therefore, the strengthening may be the result of the combined effect of precipitation strengthening and GB strengthening for some carbon-containing HEAs/MEAs. Inspired by superalloys, numerous studies [148,149,[160][161][162] have been performed introducing L1 2 phase into HEAs/MEAs to improve mechanical performance. For FCC HEAs/MEAs, the lattice mismatch between the L1 2 phase and the matrix is very small due to the coherent interfaces, so the occurrence of L1 2 phase will not cause serious stress concentration while impeding the dislocation motion.…”

Section: Precipitation Strengtheningmentioning

confidence: 99%

Strategies for Achieving Strength–Ductility Synergy in Face‐Centered Cubic High‐ and Medium‐Entropy Alloys

et al. 2023

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High‐ and medium‐entropy alloys (HEAs/MEAs), also called as multicomponent alloys, are a new class of materials that break through the traditional alloy design concept based on single principal element. However, they do not break away from the magic spell of strength–ductility trade‐off. Therefore, designing HEAs/MEAs with both high strength and high ductility still remains a great challenge nowadays. This article provides a review on the recent progress in mechanical properties of face‐centered cubic (FCC) HEAs/MEAs. First, several traditional strengthening strategies are briefly reviewed, focusing on the strengthening mechanisms and the optimized mechanical properties. Subsequently, various novel strategies for achieving strength–ductility synergy in HEAs/MEAs are summarized, which include lowering the stacking fault energy, regulating the short‐range order, promoting transformation‐induced plasticity, and constructing heterogeneous microstructures. The basic ideas and related underlying mechanisms from these strategies are discussed. Finally, the current challenges and the future outlooks are emphasized and addressed systematically. In brief, the present review is expected to provide a useful guide for the design of HEAs/MEAs with superior mechanical properties.

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“…High entropy alloys have equiatomic or near equiatomic multi‐composition with remarkable mechanical properties, including high strength, good plastic ductility, and crack resistance [1–4]. The high entropy alloys are potentional structural materials that are used under extreme conditions, such as elevated temperatures, helium iron radiation, and molten salt corrosion [5–7].…”

Section: Introductionmentioning

confidence: 99%

The effect of carbon addition on the mechanical properties and fracture behaviors of cobalt‐chromium‐iron‐ manganese‐nickel high entropy alloy

Leng,

Yang,

et al. 2024

Materialwissenschaft Werkst

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The uniaxial tensile and cupping tests of cobalt‐chromium‐iron‐manganese‐nickel high entropy alloy were performed to investigate the effect of solid soluted carbon addition on the strengthening mechanism. The results revealed that at 0.5 at % carbon, the tensile strength, uniform elongation, and cupping strength of the sample were promoted. However, the brittleness fracture appeared by further increasing carbon to 1.0 at %, as caused by the carbides along grain boundary.

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Competition between continuous and discontinuous precipitation in L12-strengthened high-entropy alloys

Cited by 27 publications

References 31 publications

Design, processing and properties of precipitation-hardenable complex concentrated alloy

Design, processing and properties of precipitation-hardenable complex concentrated alloy

Strategies for Achieving Strength–Ductility Synergy in Face‐Centered Cubic High‐ and Medium‐Entropy Alloys

The effect of carbon addition on the mechanical properties and fracture behaviors of cobalt‐chromium‐iron‐ manganese‐nickel high entropy alloy

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