The characteristics of serration in Al0.5CoCrFeNi high entropy alloy

Niu, Sizhe; Kou, Hongchao; Zhang, Yu; Wang, Jun; Li, Jinshan

doi:10.1016/j.msea.2017.05.075

Cited by 63 publications

(35 citation statements)

References 37 publications

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“…[173] The transformation of serration type from type A to type A þ B and finally into type B þ C with increasing temperature (200-500 C) and decreasing strain rate (10 À3 -10 À4 s À1 ) was observed in Al 0.5 CrFeCoNi HEA with dual phase (FCC and BCC). [171] The elongation to fracture and tensile strength decreased with an increase in temperature. The reduction in elongation to fracture is attributed to the dynamic strain aging phenomenon because the solute atoms can hinder the movement of dislocations by interacting with them.…”

Section: Mechanical Properties At Elevated Temperaturementioning

confidence: 98%

“…[170] The serrations in flow behavior have been reported for few HEAs. [169,[171][172][173][174] Serrations, in general, can occur in flow curve during plastic deformation due to many factors, and one of them is the interaction between solute atoms and dislocations. The Al 0.5 CrFeCoNiCu HEA shows the directional transformation of serrations from upward serrations at 400-500 C to downward serrations at 600 C (shown in Figure 10).…”

Section: Mechanical Properties At Elevated Temperaturementioning

confidence: 99%

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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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Section: Mechanical Properties At Elevated Temperaturementioning

confidence: 98%

Section: Mechanical Properties At Elevated Temperaturementioning

confidence: 99%

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

2017

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“…Serrated flow means the occurrence of serrations on the stress–strain curves in a certain range of temperatures and strain rates, indicating HEAs deformation between the homogenous and inhomogenous deformation 46. Whereafter, Li et al revealed that dynamic strain aging was the reason for serrated flow 47. They pointed out the solute atmosphere of additive Al could increase the frictional stress of dislocations.…”

Section: Phase Structure Of Heasmentioning

confidence: 99%

Phase Engineering of High‐Entropy Alloys

et al. 2020

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High‐entropy alloys (HEAs) are based on five or more principal elements with equal or nearly equal molar fractions and possess many significant advantages over traditional alloys, including high strength and hardness, excellent corrosion resistance, outstanding thermal stability, and irradiation resistance. Phase structure plays a vital role in determining the property of HEAs. For further enhancing the performance of HEAs in various application fields, a controllable synthesis with desired phases is required. In this review, the diverse phase structures of HEAs and the related properties are first introduced. Then, alternative tuning strategies to promote the desired phase structure of HEAs are focused upon. Property adjusting of phase‐engineered HEAs is also discussed in depth. Lastly, some insights into the challenges and future prospects in this rapidly emerging research field are provided.

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“…Generally, in a HEA, four or more principal elements can be mixed in near-equiatomic ratios or at least with each element being between 5 at% and 35 at% to generate a maximum molar configurational entropy of ΔS mix =R•lnN, where N is the number of components and R is the gas constant [1][2][3]. As a result, HEAs exhibit superior strength and ductility [4], outstanding irradiation resistance [5], good corrosion resistance [6], high fracture toughness [7], interesting creep characteristics [8] and plastic behavior [9]. Inspired by HEAs concept, the concept of high-entropy ceramics (HECs), namely multicomponent ionic compounds, was first proposed in the multicomponent metal oxides in 2015 [10] and then it has been gaining significant interest in recent years.…”

Section: Introductionmentioning

confidence: 99%

High-entropy alumino-silicides: a novel class of high-entropy ceramics

Wen

Liu

et al. 2019

Sci. China Mater.

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High-entropy ceramics (HECs) are gaining significant interest due to their huge composition space, unique microstructure, and adjustable properties. Previously reported studies focus mainly on HECs with the multi-cationic structure, while HECs with more than one anion are rarely studied. Herein we reported a new class of HECs, namely highentropy alumino-silicides (Mo 0.25 Nb 0.25 Ta 0.25 V 0.25)(Al 0.5 Si 0.5) 2 (HEAS-1) with multi-cationic and-anionic structure. The formation possibility of HEAS-1 was first theoretically analyzed from the aspects of thermodynamics and lattice size difference based on the first-principles calculations and then the HEAS-1 were successfully synthesized by the solid-state reaction at 1573 K. The as-synthesized HEAS-1 exhibited good single-crystal hexagonal structure of metal alumino-silicides and simultaneously possessed high compositional uniformity. This study not only enriches the categories of HECs but also will open up a new research field on HECs with multi-cationic and-anionic structure.

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The characteristics of serration in Al0.5CoCrFeNi high entropy alloy

Cited by 63 publications

References 37 publications

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

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

Phase Engineering of High‐Entropy Alloys

High-entropy alumino-silicides: a novel class of high-entropy ceramics

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