Microstructure and texture evolution during annealing of equiatomic CoCrFeMnNi high-entropy alloy

Bhattacharjee, P.P.; Sathiaraj, G. Dan; Zaid, Mohd Hafiz Mohd; Gatti, J. R.; Lee, Chi; Tsai, Che-Wei; Yeh, Jien‐Wei

doi:10.1016/j.jallcom.2013.10.237

Cited by 431 publications

(144 citation statements)

References 28 publications

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“…The main reasons are the slower recrystallization rate in regions with brass texture, and the absence of preferential nucleation of brass-textured grains from shear bands. [58] The low SFE in the CoCrFeMnNi alloy as suggested by Bhattacharjee et al [58] is indeed confirmed by Zaddach et al [59] They combined experiments with first-principle calculations and concluded that the SFE of CoCrFeMnNi is between 18.3 and 27.3 mJ/m 2 . This value is close to that of conventional low-SFE alloys such as AISI 304L and brass.…”

Section: Basic Concepts and Deformation Behaviorsmentioning

confidence: 77%

“…The texture evolution (during cold rolling) and recrystallization behavior in the same alloy have also been studied. [58] The texture after 90% cold rolling was predominantly brass-type, which indicates low stacking fault energy (SFE). Bhattacharjee et al suggested that the lower SFE in HEAs is due to the higher free energy of the 'perfect crystal' in HEAs.…”

Section: Basic Concepts and Deformation Behaviorsmentioning

confidence: 99%

“…The CoCrFeMnNi alloy is a classic sole-FCC HEA and does not experience phase transformation when annealed. Therefore, it is a good model system to study the behavior of multiprincipal-element solid solutions and has been used to study the grain growth, [88] diffusion, [19] dislocation behavior, [57] and texture evolution [58] of FCC HEAs. This alloy is soft (yield strength ∼170 MPa), very ductile (elongation ∼60%), and shows high strain hardening capability at room temperature.…”

Section: Derivatives Of the Al-co-cr-cu-fe-ni Alloymentioning

confidence: 99%

“…Because reasonable ductility is crucial to structural applications, more studies on tensile behaviors are definitely needed. Additionally, except for a few examples, [57][58][59]141] not much is known about the deformation of HEAs, e.g. dislocation behavior, deformation twinning, deformation microstructures, texture evolution, stacking fault energy, etc.…”

Section: Corrosion Propertiesmentioning

confidence: 99%

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High-Entropy Alloys: A Critical Review

Tsai

Yeh

2014

Materials Research Letters

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2,345

853

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High-entropy alloys (HEAs) are alloys with five or more principal elements. Due to the distinct design concept, these alloys often exhibit unusual properties. Thus, there has been significant interest in these materials, leading to an emerging yet exciting new field. This paper briefly reviews some critical aspects of HEAs, including core effects, phases and crystal structures, mechanical properties, high-temperature properties, structural stabilities, and corrosion behaviors. Current challenges and important future directions are also pointed out.

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Section: Basic Concepts and Deformation Behaviorsmentioning

confidence: 77%

Section: Basic Concepts and Deformation Behaviorsmentioning

confidence: 99%

Section: Derivatives Of the Al-co-cr-cu-fe-ni Alloymentioning

confidence: 99%

Section: Corrosion Propertiesmentioning

confidence: 99%

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High-Entropy Alloys: A Critical Review

Tsai

Yeh

2014

Materials Research Letters

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853

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“…According to the present interatomic potential, the lattice parameter of the CoCrFeMnNi HEA was 3.595 Å at 0 K, which is close to the experimental values, 3.59 (ref. 25 ) and 3.592 Å (ref. 26 ).…”

Section: Resultsmentioning

confidence: 99%

Understanding the physical metallurgy of the CoCrFeMnNi high-entropy alloy: an atomistic simulation study

et al. 2018

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Although high-entropy alloys (HEAs) are attracting interest, the physical metallurgical mechanisms related to their properties have mostly not been clarified, and this limits wider industrial applications, in addition to the high alloy costs. We clarify the physical metallurgical reasons for the materials phenomena (sluggish diffusion and micro-twining at cryogenic temperatures) and investigate the effect of individual elements on solid solution hardening for the equiatomic CoCrFeMnNi HEA based on atomistic simulations (Monte Carlo, molecular dynamics and molecular statics). A significant number of stable vacant lattice sites with high migration energy barriers exists and is thought to cause the sluggish diffusion. We predict that the hexagonal close-packed (hcp) structure is more stable than the face-centered cubic (fcc) structure at 0 K, which we propose as the fundamental reason for the micro-twinning at cryogenic temperatures. The alloying effect on the critical resolved shear stress (CRSS) is well predicted by the atomistic simulation, used for a design of non-equiatomic fcc HEAs with improved strength, and is experimentally verified. This study demonstrates the applicability of the proposed atomistic approach combined with a thermodynamic calculation technique to a computational design of advanced HEAs.

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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 texture evolution during annealing of equiatomic CoCrFeMnNi high-entropy alloy

Cited by 431 publications

References 28 publications

High-Entropy Alloys: A Critical Review

High-Entropy Alloys: A Critical Review

Understanding the physical metallurgy of the CoCrFeMnNi high-entropy alloy: an atomistic simulation study

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

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