Development of a Refractory High Entropy Superalloy

Senkov, O.N.; Isheim, Dieter; Seidman, David N.; Pilchak, Adam L.

doi:10.3390/e18030102

Cited by 235 publications

(119 citation statements)

References 35 publications

(47 reference statements)

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“…Especially if the shape of the precipitates is closely related to the lattice misfit, ε, between the precipitated phase and the matrix phase [29,[31][32][33][34][35][36][37][38]. Generally speaking, a smaller …”

Section: Microscopic Morphologies Of Bcc/b2 Phases In Heasmentioning

confidence: 99%

The BCC/B2 Morphologies in AlxNiCoFeCr High-Entropy Alloys

Jiang

et al. 2017

Metals

132

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Abstract:The present work primarily investigates the morphological evolution of the body-centered-cubic (BCC)/B2 phases in Al x NiCoFeCr high-entropy alloys (HEAs) with increasing Al content. It is found that the BCC/B2 coherent morphology is closely related to the lattice misfit between these two phases, which is sensitive to Al. There are two types of microscopic BCC/B2 morphologies in this HEA series: one is the weave-like morphology induced by the spinodal decomposition, and the other is the microstructure of a spherical disordered BCC precipitation on the ordered B2 matrix that appears in HEAs with a much higher Al content. The mechanical properties, including the compressive yielding strength and microhardness of the Al x NiCoFeCr HEAs, are also discussed in light of the concept of the valence electron concentration (VEC).

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Section: Microscopic Morphologies Of Bcc/b2 Phases In Heasmentioning

confidence: 99%

The BCC/B2 Morphologies in AlxNiCoFeCr High-Entropy Alloys

Jiang

et al. 2017

Metals

132

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“…This alloy has a tensile strength of 650 MPa at 800˝C, which is higher than that of Inconel 617 (less than 500 MPa) [85]. Senkov et al used a very different approach to obtain HESAs [54]. Using mostly refractory elements, they synthesized an alloy AlMo 0.5 NbTa 0.5 TiZr that contains high density cubic/plate-like precipitates embedded in a matrix-which looks similar to the structures of Ni-based superalloys.…”

Section: High-entropy Superalloys (Hesa)mentioning

confidence: 99%

“…Therefore, these alloys have great potential in high temperature applications. Many other refractory HEAs were developed later to obtain improved strength, room temperature ductility, and density [40,41,[47][48][49][50][51][52][53][54]. For example, Al addition in certain systems can bring advantages such as higher hardness and high-temperature strength, better room temperature plasticity, and lower density [48].…”

Section: Refractory Heasmentioning

confidence: 99%

Three Strategies for the Design of Advanced High-Entropy Alloys

Tsai

2016

Entropy

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High-entropy alloys (HEAs) have recently become a vibrant field of study in the metallic materials area. In the early years, the design of HEAs was more of an exploratory nature. The selection of compositions was somewhat arbitrary, and there was typically no specific goal to be achieved in the design. Very recently, however, the development of HEAs has gradually entered a different stage. Unlike the early alloys, HEAs developed nowadays are usually designed to meet clear goals, and have carefully chosen components, deliberately introduced multiple phases, and tailored microstructures. These alloys are referred to as advanced HEAs. In this paper, the progress in advanced HEAs is briefly reviewed. The design strategies for these materials are examined and are classified into three categories. Representative works in each category are presented. Finally, important issues and future directions in the development of advanced HEAs are pointed out and discussed.

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“…Observed phases include disordered solid solutions, amorphous phases and intermetallic compounds. A large variety of morphologies are seen, arising from phase transformations that include order/disorder transformation [5,6], spinodal decomposition [7][8][9][10], precipitation [4,11,12] and massive transformation [13,14].…”

Section: Introductionmentioning

confidence: 99%

Mapping the world of complex concentrated alloys

2017

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This work explores the mechanical properties of high entropy alloys (HEAs) and complex concentrated alloys (CCAs) by comparing them with commercially available engineering alloys including industrystandard aerospace alloys. To reach this goal we have developed a materials database covering the main mechanical properties of HEAs and CCAs from the published literature. The database is used to represent various property spaces enabling an assessment of their performance for light weight structures and high-temperature structural applications. In addition, we illustrate the effects of alloying and of specific elements on the room temperature mechanical properties of HEAs and CCAs. With densities between titanium alloys and steels or nickel alloys, the best CCAs exceed commercial alloys in uniaxial loading and beam bending at room temperature. Where use temperature or cost excludes commercial alloys based on Mg, Al or Ti, the best CCAs also offer attractive specific yield strength in panel bending and specific stiffness for all loading conditions at room temperature. Many CCAs have superior structural properties at elevated temperatures. 2 KEYWORDSHigh entropy alloys, complex concentrated alloys, mechanical properties, materials selection, property space.

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Development of a Refractory High Entropy Superalloy

Cited by 235 publications

References 35 publications

The BCC/B2 Morphologies in AlxNiCoFeCr High-Entropy Alloys

The BCC/B2 Morphologies in AlxNiCoFeCr High-Entropy Alloys

Three Strategies for the Design of Advanced High-Entropy Alloys

Mapping the world of complex concentrated alloys

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