A TRIP-assisted dual-phase high-entropy alloy: Grain size and phase fraction effects on deformation behavior

Li, Zhi Ming; Taşan, Cemal Cem; Pradeep, Konda Gokuldoss; Raabe, Dierk

doi:10.1016/j.actamat.2017.03.069

Cited by 571 publications

(189 citation statements)

References 66 publications

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“…Long-term annealing treatments (e.g., 500 days) at intermediate temperatures (e.g., 700°C and 500°C) can lead to chemical segregations even for the single-phase equiatomic CoCrFeMnNi HEA. 8 Interestingly, for the recently designed TRIPassisted dual-phase HEAs, 13 annealing treatments can be used not only to control the grain size, but also to modify the phase fractions in the microstructure. Figure 4 shows the variations in the FCC grain size and HCP phase fraction of the quaternary dual-phase Fe 50 Mn 30 Co 10 Cr 10 HEA with increasing annealing time at 900°C.…”

Section: Processing Of Strong and Ductile Bulk Non-equiatomic High-enmentioning

confidence: 99%

“…Figure 4 shows the variations in the FCC grain size and HCP phase fraction of the quaternary dual-phase Fe 50 Mn 30 Co 10 Cr 10 HEA with increasing annealing time at 900°C. 13 In cold-rolled condition, the alloy shows average grain size of $250 nm and HCP phase fraction of $91%. After extending the annealing time from 3 min to 60 min, the average FCC grain size increased gradually from $4.5 lm to $17.5 lm.…”

Section: Processing Of Strong and Ductile Bulk Non-equiatomic High-enmentioning

confidence: 99%

“…4 This leads to a significantly improved strengthductility combination compared with corresponding equiatomic HEAs, mainly due to the combination of massive solid-solution strengthening and the TRIP effect. 4,13 The above-mentioned findings clearly indicate that expanding the HEA design concept to nonequiatomic compositions has great potential for pursuing more compositional opportunities for design of novel materials with exceptional properties.…”

Section: Introductionmentioning

confidence: 99%

“…In this context, nonequiatomic HEAs with single-, dual-, or multiphase structure have recently been proposed to explore the flexibility of HEA design and overcome the limitations of the original HEA design concept. 4,13,14 Also, deviation from the equimolar composition rule facilitates identification of compositions which allow the often-brittle intermetallic phases to be avoided.…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, recent studies have revealed that outstanding mechanical properties exceeding those of equiatomic HEAs can be achieved by non-equiatomic alloys. 4,13 As one of the possible pathways, a novel type of transformation-induced plasticity-assisted dualphase (TRIP-DP) HEA was developed. 4 The two constituent phases in the alloy, i.e., the face-centered cubic (FCC) matrix and the hexagonal close-packed (HCP) phase, are compositionally equivalent and thus can both be referred to as high-entropy phases.…”

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

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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: Processing Of Strong and Ductile Bulk Non-equiatomic High-enmentioning

confidence: 99%

Section: Processing Of Strong and Ductile Bulk Non-equiatomic High-enmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Raabe

2017

JOM

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274

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High‐Entropy Alloys: Potential Candidates for High‐Temperature Applications – An Overview

2017

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Multi-principal elemental alloys, commonly referred to as high-entropy alloys (HEAs), are a new class of emerging advanced materials with novel alloy design concept. Unlike the design of conventional alloys, which is based on one or at most two principal elements, the design of HEA is based on multi-principal elements in equal or near-equal atomic ratio. The advent of HEA has revived the alloy design perception and paved the way to produce an ample number of compositions with different combinations of promising properties for a variety of structural applications. Among the properties possessed by HEAs, sluggish diffusion and strength retention at elevated temperature have caught wide attention. The need to develop new materials for high-temperature applications with superior high-temperature properties over superalloys has been one of the prime concerns of the high-temperature materials research community. The current article shows that HEAs have the potential to replace Ni-base superalloys as the next generation hightemperature materials. This review focuses on the phase stability, microstructural stability, and high-temperature mechanical properties of HEAs. This article will be highly beneficial for materials science and engineering community whose interest is in the development and understanding of HEAs for high-temperature applications.

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Microstructure and Mechanical Properties of Al_25 − xCr_{25 + 0.5x}Fe₂₅Ni_{25 + 0.5x} (x = 19, 17, 15 at%) Multi‐Component Alloys

Liu

Zuo

et al. 2018

Adv Eng Mater

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A series of Al25 − xCr25 + 0.5xFe25Ni25 + 0.5x (x = 19, 17, 15 at%) multi‐component alloys are prepared by arc‐melting and rapid solidification of copper molds. The technique of thermal‐mechanical processing is further applied to the master alloys to improve their mechanical properties. These alloys consist of face‐centered cubic (FCC) and body‐centered cubic (BCC) structure. The volume fraction of the BCC phase increases as Al content increase and Cr and Ni contents decrease, accompanied with a microstructural evolution from dendritic structure to lamella‐like structure. Due to the increase of volume fraction of BCC phase, the master alloys exhibit an increased strength and a declined ductility as Al content increases. The rapid solidified alloys have more BCC phase compared with the master alloys, which enhances the strength and decreases the ductility. After homogenization, hot‐rolling, and annealing at 1000 °C, the Al8Cr33.5Fe25Ni33.5 alloy displays excellent combination of strength (yield strength is ∼635 MPa and fracture strength is ∼1155 MPa) and ductility (tension strain is ∼11%).

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A TRIP-assisted dual-phase high-entropy alloy: Grain size and phase fraction effects on deformation behavior

Cited by 571 publications

References 66 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

High‐Entropy Alloys: Potential Candidates for High‐Temperature Applications – An Overview

Microstructure and Mechanical Properties of Al_25 − xCr_{25 + 0.5x}Fe₂₅Ni_{25 + 0.5x} (x = 19, 17, 15 at%) Multi‐Component Alloys

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A TRIP-assisted dual-phase high-entropy alloy: Grain size and phase fraction effects on deformation behavior

Cited by 571 publications

References 66 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

High‐Entropy Alloys: Potential Candidates for High‐Temperature Applications – An Overview

Microstructure and Mechanical Properties of Al25 − xCr25 + 0.5xFe25Ni25 + 0.5x (x = 19, 17, 15 at%) Multi‐Component Alloys

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Product

Resources

About

Microstructure and Mechanical Properties of Al_25 − xCr_{25 + 0.5x}Fe₂₅Ni_{25 + 0.5x} (x = 19, 17, 15 at%) Multi‐Component Alloys