Composition Dependence of Phase Stability, Deformation Mechanisms, and Mechanical Properties of the CoCrFeMnNi High-Entropy Alloy System

Taşan, Cemal Cem; Deng, Yun; Pradeep, Konda Gokuldoss; Yao, Mengji; Springer, Hauke; Raabe, Dierk

doi:10.1007/s11837-014-1133-6

Cited by 149 publications

(78 citation statements)

References 28 publications

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“…Specifically, the Fe 35 Mn 45 Co 10 Cr 10 alloy has a single FCC structure with dislocation slip as the main deformation mechanism, while Fe 40 Mn 40 Co 10 Cr 10 additionally exhibits a TWIP effect of the single FCC structure. 9,12 With further decrease of the Mn content, which results in a 23 This indicates that the TRIP-DP effect introduced into the former quaternary alloy can also be realized in quinary alloys with higher mixing entropy value.…”

Section: Compositional Design Of Strong and Ductile Non-equiatomic Himentioning

confidence: 96%

“…[1][2][3][4][5][6] A large number of studies in this field have been motivated by the original HEA concept, which suggested that achieving maximized configurational entropy using equiatomic ratios of multiple principal elements could stabilize singlephase massive solid-solution phases. 1 However, an increasing number of studies have revealed that formation of single-phase solid solutions in HEAs shows weak dependence on maximization of the configurational entropy through equiatomic ratios of elements, [7][8][9][10] and it was even found that maximum entropy is not the most essential parameter when designing multicomponent alloys with superior properties. 11,12 These findings encouraged efforts to relax the unnecessary restrictions on both the equiatomic ratio of multiple principal elements as well as the formation of single-phase solid solutions.…”

Section: Introductionmentioning

confidence: 99%

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Strong and Ductile Non-equiatomic High-Entropy Alloys: Design, Processing, Microstructure, and Mechanical Properties

Raabe

2017

JOM

274

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We present a brief overview on recent developments in the field of strong and ductile non-equiatomic high-entropy alloys (HEAs). The materials reviewed are mainly based on massive transition-metal solute solutions and exhibit a broad spectrum of microstructures and mechanical properties. Three relevant aspects of such non-equiatomic HEAs with excellent strength-ductility combination are addressed in detail, namely phase stability-guided design, controlled and inexpensive bulk metallurgical processing routes for appropriate microstructure and compositional homogeneity, and the resultant microstructure-property relations. In addition to the multiple principal substitutional elements used in these alloys, minor interstitial alloying elements are also considered. We show that various groups of strong and ductile HEAs can be obtained by shifting the alloy design strategy from single-phase equiatomic to dual-or multiphase non-equiatomic compositional configurations with carefully designed phase instability. This design direction provides ample possibilities for joint activation of a number of strengthening and toughening mechanisms. Some potential research efforts which can be conducted in the future are also proposed.

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Section: Compositional Design Of Strong and Ductile Non-equiatomic Himentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Strong and Ductile Non-equiatomic High-Entropy Alloys: Design, Processing, Microstructure, and Mechanical Properties

Raabe

2017

JOM

274

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“…Recently, Tasan et al [48,49] showed that the equiatomic quaternary CoCrFeMn alloy surprisingly leads to a complex multiphase microstructure containing several intermetallic phases, while the non-equiatomic material Co 10 CrFe 40 Mn 10 produces a homogeneous fcc single phase. In some other work done by the same group [50], a novel single phase, non-equiatomic CoCrFeMnNi high-entropy alloy with exceptional phase stability and tensile ductility is reported.…”

Section: Non-equiatomic Composition As a Better Design Approachmentioning

confidence: 99%

“…Authors suggested that this might be the reason why only few compositions of HEAs could truly achieve single-phase structure. To produce a homogeneous single phase crystalline solid solutions, it is more important to avoid the formation of intermetallic phases rather maximize the entropy [43,44,49,50]. Therefore, from a thermodynamic point of view, it is more important to analyze the likelihood of intermetallic compounds in the multi-component phase diagram rather than only analyzing the configurational entropy.…”

Section: Non-equiatomic Composition As a Better Design Approachmentioning

confidence: 99%

An Insight into Evolution of Light Weight High Entropy Alloys: A Review

Kumar

Gupta

2016

Metals

144

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High Entropy Alloys (HEAs) are the most recently developed new class of materials, which are known for their unique structural properties. Lightweight materials are currently in excessive demand for transportation and energy saving applications. In this review, efforts have been made to summarize the work done towards the development of HEAs targeting lightweight applications. Some new synthesis techniques are suggested for the fabrication of lightweight HEAs (LWHEAs). The concept of porous structure fabrication, microwave sintering of green compact, casting by disintegration melt deposition and advanced manufacturing using additive manufacturing are discussed as future directions of LWHEAs synthesis. LWHEAs for potential biomedical applications have also been addressed.

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“…HEAs consist of at least five principal elements, each element with a 5-35% concentration. These alloys have many exceptional properties compared with the traditional alloys due to the high mixing entropy, sluggish diffusion and lattice distortion effects, including good thermal stability, high mechanical strength and excellent corrosion resistance [3][4][5]. The properties of HEAs, such as hardness, ductility and magnetic properties can be tuned by changing the type and concentration of components [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Effects of Short-Range Order on the Magnetic and Mechanical Properties of FeCoNi(AlSi)x High Entropy Alloys

Feng

Wang

2017

Metals

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Abstract:The properties of a material are sensitive to chemically-ordered structure in multi-element alloys. Understanding the effects of chemical short-range order (SRO) on magnetic and mechanical properties is important. In this work, we use the Monte Carlo method in combination with density functional theory to investigate atomic nearest neighbor distribution, magnetic moment and elastic modulus in FeCoNi (AlSi) x alloys. It is found that the prominent feature of the FeCoNi (AlSi) x alloys is the change of SRO parameters: the SRO parameters are positive between Al-Al, Al-Si, Si-Si pairs and negative between Ni-Al, Co-Si, Fe-Co, Ni-Si and Fe-Si pairs. The Al and Si elements tend to bond with Fe, Co, Ni elements to form an SRO structure. The change of the atomic nearest neighbor environment leads to a reduction in the atomic magnetic moments of magnetic elements. The calculated saturation magnetizations by considering the effect of SRO are in good accord with the experimental values. We further show that SRO leads to an increase of the elastic modulus, by sacrificing ductility and isotropy. In the study of the structure and properties of high entropy alloys, the effect of SRO should not be ignored.

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Composition Dependence of Phase Stability, Deformation Mechanisms, and Mechanical Properties of the CoCrFeMnNi High-Entropy Alloy System

Cited by 149 publications

References 28 publications

Strong and Ductile Non-equiatomic High-Entropy Alloys: Design, Processing, Microstructure, and Mechanical Properties

Strong and Ductile Non-equiatomic High-Entropy Alloys: Design, Processing, Microstructure, and Mechanical Properties

An Insight into Evolution of Light Weight High Entropy Alloys: A Review

Effects of Short-Range Order on the Magnetic and Mechanical Properties of FeCoNi(AlSi)x High Entropy Alloys

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