Discontinuous precipitation leading to nano-rod intermetallic precipitates in an Al0.2Ti0.3Co1.5CrFeNi1.5 high entropy alloy results in an excellent strength-ductility combination

Dasari, Sriswaroop; Chang, Yao‐Jen; Jagetia, Abhinav; Soni, Vishal; Sharma, Abhishek; Gwalani, Bharat; Gorsse, Stéphane; Yeh, An‐Chou; Banerjee, Rajarshi

doi:10.1016/j.msea.2020.140551

Cited by 36 publications

(12 citation statements)

References 47 publications

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“…Recently, the excellent mechanical properties of a DP structure containing coherent c/c 0 lamellae have been demonstrated by Nash and Zhou et al [21,22] (Fig. 2), Fan et al [23] and Banerjee et al [24]. In Fan's recent publication, they reported a combination of over 2GPa yield strength and 16% tensile ductility in coherent nanolamellar alloys in Ni-Fe-Co-Cr-Al-Ti multicomponent alloys, where they attribute the large uniform ductility with the ultrahigh-strength level to the synergies of coherent nano-lamellar boundary strengthening, high-density Lomer-Cottrell locks, hierarchical stacking-fault networks, as well as the ductile nature of L1 2 lamellae.…”

Section: Structural Propertiesmentioning

confidence: 88%

Invited viewpoint: in situ nanostructured lamellar composites

Nash

Zhou

2022

J Mater Sci

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The discontinuous precipitation reaction has been observed in many alloys for more than 50 years. Most of the work on this phase transformation is aimed at suppressing it as it is known to be deleterious for mechanical properties when it is confined to grain boundary regions. However, it has been postulated that if the transformation goes to completion, then significant strengthening can occur analogous to the pearlite transformation in steels. In this article, we argue that this transformation has the potential to offer a new paradigm for both structural and functional applications.

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Section: Structural Propertiesmentioning

confidence: 88%

Invited viewpoint: in situ nanostructured lamellar composites

Nash

Zhou

2022

J Mater Sci

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“…A good example is the Al 3.31 Co 27.27 Cr 18.18 Fe 18.18 Ni 27.27 Ti 5.78 alloy [ 16 ], comprising a γ/γ’ microstructure similar to classical Ni-based superalloys consisting of a disordered solid solution FCC matrix (γ-phase) and coherent, ordered L1 2 precipitates (γ’-phase). This alloy has already been partly investigated in the peak aging condition [ 17 , 18 ], including aging at various temperatures [ 19 ]. However, the composition of the γ/γ’ microstructure may undergo significant changes during heat treatment, calling for the necessity of detailed investigations regarding the behavior of such alloys during tempering.…”

Section: Introductionmentioning

confidence: 99%

Microstructure-Property Correlation and Its Evolution during Aging in an Al4.4Co26Cr19Fe18Ni27Ti5.6 High-Entropy Alloy

et al. 2023

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The efficient energy use in multiple sectors of modern industry is partly based on the efficient use of high-strength, high-performance alloys that retain remarkable mechanical properties at elevated and high temperatures. High-entropy alloys (HEAs) represent the most recent class of these materials with a high potential for high-temperature high-strength applications. Aside from their chemical composition and microstructure-property relationship, limited information on the effect of heat treatment as a decisive factor for alloy design is available in the literature. This work intends to contribute to this research topic by investigating the effect of heat treatment on the microstructure and mechanical performance of an Al4.4Co26Cr19Fe18Ni27Ti5.6 HEA. The solution annealed state is compared to aged states obtained at different heat treatment times at 750 °C. The temporal evolution of the matrix and the γ’-precipitates are analyzed in terms of chemical composition, crystallography, size, shape, and volume fraction by means of scanning electron microscopy, transmission electron microscopy, and atom probe tomography. The yield strength evolution and strength contributions are calculated by classical state-of-the-art models as well as by ab-initio-based calculations of the critical resolved shear stress. The findings indicate promising mechanical properties of the investigated alloy and provide insight not only into possible strengthening mechanisms but also into the evolution of main phases during the heat treatment.

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“…Therefore, annealing after cold deformation can lead to heterogenous microstructures due to inhomogeneous rates of recrystallization and precipitation of equilibrium/non-equilibrium phases. Multiple reports exist highlighting the microstructural modification and mechanical properties of such heterogeneous microstructures created by following this approach [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…HEA/CCAs offer a variety of phase transformation pathways leading to novel microstructures containing intermetallic phases such as L12, B2, , laves and  phases [9][10][11][12]. For example, in case of an FCC based Al0.2Ti0.3Co1.5CrFeNi1.5 alloy, it has been observed that precipitation annealing directly after cold rolling resulted in a discontinuously precipitated nano-lamellar/nanorod type microstructure consisting of L12 and FCC phases [8]. This is in contrast to the classical +' type microstructure comprising of spherical L12 precipitates which results from solutionizing prior to annealing after cold rolling and is a result of homogeneous precipitation of L12 phase within the FCC matrix.…”

Section: Introductionmentioning

confidence: 99%

Insights into Defect-Mediated Nucleation of Equilibrium B2 Phase in Face-Centered Cubic High-Entropy Alloys

Sharma

Gwalani

Dasari

et al. 2021

JOM

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Discontinuous precipitation leading to nano-rod intermetallic precipitates in an Al0.2Ti0.3Co1.5CrFeNi1.5 high entropy alloy results in an excellent strength-ductility combination

Cited by 36 publications

References 47 publications

Invited viewpoint: in situ nanostructured lamellar composites

Invited viewpoint: in situ nanostructured lamellar composites

Microstructure-Property Correlation and Its Evolution during Aging in an Al4.4Co26Cr19Fe18Ni27Ti5.6 High-Entropy Alloy

Insights into Defect-Mediated Nucleation of Equilibrium B2 Phase in Face-Centered Cubic High-Entropy Alloys

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