High Temperature Oxidation and Corrosion Properties of High Entropy Superalloys

Tsao, Te Kang; Yeh, An‐Chou; Kuo, Chung-Ming; Murakami, Hideyuki

doi:10.3390/e18020062

Cited by 86 publications

(47 citation statements)

References 45 publications

(45 reference statements)

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“…The materials should exhibit good mechanical strength and surface stability at elevated temperatures . Therefore, in our previous study, face‐centered cubic (FCC) high entropy Ni‐based alloys with L1 2 γ′ precipitates were developed, as the strengthening mechanism of superalloys. The uniformly distributed γ′ can be coherent with the FCC γ matrix and remain stable till high temperatures to impart strengthening .…”

Section: Introductionmentioning

confidence: 99%

On The Superior High Temperature Hardness of Precipitation Strengthened High Entropy Ni‐Based Alloys

et al. 2016

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The microstructure and high temperature hardness of two face-centered cubic high entropy Ni-based alloys with L1 2 g 0 precipitates have been studied. Both alloys exhibit higher mixing entropy and with the advantages in lower density and lower cost of raw materials than conventional Ni-based superalloys. Their g 0 solvus are above 1 150 C, and the g-g 0 microstructure can be thermodynamically stable after isothermal ageing from 700 to 1 100 C for at least 500 h. By XRD peak deconvolution, positive lattice misfits between g and g 0 have been shown till elevated temperatures. The results from nano-indentation test indicate that their highly alloyed g 0 phase have rendered more significant strengthening, and the underlying mechanism can be attributed to the higher anti-phase boundary energy. Therefore, with minor refractory additions, the bulk hardness of present alloys can surpass that of commercial superalloy from room to high temperature.

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Section: Introductionmentioning

confidence: 99%

On The Superior High Temperature Hardness of Precipitation Strengthened High Entropy Ni‐Based Alloys

et al. 2016

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“…Elemental map analysis of Ni at the interface of base metal–wustite (zone A in Figure a) showed that this zone is richer in Ni than the base metal. This enrichment, as shown in Figure a, is probably because that Ni is more noble than iron and therefore it accumulates at the oxide–metal interface . As will be shown later, the diffusion of Ni in iron is very slow and as a result, it could not diffuse back rapidly to iron and will concentrate at the oxide–metal interface.…”

Section: Resultsmentioning

confidence: 89%

Influence of Nickel on High‐Temperature Oxidation and Characteristics of Oxide Layers in Two High‐Strength Steels

Vedaei-Sabegh

Morin²,

Jahazi

2019

steel research int.

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The oxidation behaviors of two high‐strength medium carbon steels with different Ni concentrations are investigated by means of differential thermal analysis equipped with thermogravimetry (TG). Four different oxidation temperatures and five oxidation times are tested. A parabolic behavior is observed for the oxide growth in both alloys; however, the relative increases in the oxidation rate from one temperature to another are not similar for both alloys, and the oxidation kinetics of the Ni‐rich steel are significantly lower than those of the low Ni alloy. On the basis of the TG results, the activation energy for the oxidation of the two alloys is determined. The influence of Ni content on the microstructure and characteristics of the different oxide layers is studied using a combination of laser confocal microscopy, electron microscopy, and X‐ray diffraction (XRD) analysis. The results revealed a clear influence of Ni on the nature and relative presence of different oxide layers. The results are interpreted in terms of the influence of Ni on the diffusion of oxygen through the oxide layer.

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“…Tsao et al [223] investigated the high-temperature oxidation and corrosion properties of high-entropy superalloys based on Al-Ti-Cr-Fe-Co-Ni system and compared their properties with CM247LC -Ni-base superalloy. The oxidation tests were performed in the temperature range of 900-1100 C for the duration of 5-200 h. They studied the corrosion behavior by performing the salt-coated and crucible tests.…”

Section: High-temperature Oxidation and Hot Corrosion Resistancementioning

confidence: 99%

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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High Temperature Oxidation and Corrosion Properties of High Entropy Superalloys

Cited by 86 publications

References 45 publications

On The Superior High Temperature Hardness of Precipitation Strengthened High Entropy Ni‐Based Alloys

On The Superior High Temperature Hardness of Precipitation Strengthened High Entropy Ni‐Based Alloys

Influence of Nickel on High‐Temperature Oxidation and Characteristics of Oxide Layers in Two High‐Strength Steels

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

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