High temperature oxidation behavior of an equimolar refractory metal-based alloy 20Nb 20Mo 20Cr 20Ti 20Al with and without Si addition

Gorr, Bronislava; Mueller, Franz H.; Christ, Hans‐Jürgen; Mueller, Tim; Chen, Hans; Kauffmann, Alexander; Heilmaier, Martin

doi:10.1016/j.jallcom.2016.07.219

Cited by 171 publications

(80 citation statements)

References 54 publications

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“…The high-temperature oxidation behavior of HEAs is a relatively new and important topic and so far only a few studies on oxidation and corrosion of HEAs have been performed (Huang et al, 2004;Tsai et al, 2011;Senkov et al, 2012;Butler et al, 2015;Gorr et al, 2015Gorr et al, , 2016Holcomb et al, 2015;Liu et al, 2015;Butler and Weaver, 2016;Laplanche et al, 2016;Dabrowa et al, 2017). Here we report a study of the hightemperature oxidation behavior of Ni, FeNi, CoFeNi, CoCrFeNi, and CoCrFeMnNi.…”

Section: Introductionmentioning

confidence: 95%

Nonlinear Oxidation Behavior in Pure Ni and Ni-Containing Entropic Alloys

et al. 2018

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We performed a combined experimental and theoretical investigation of the oxidation behavior of pure Ni and of the following multi-component Ni-containing alloys with nearly equiatomic compositions: FeNi, CoFeNi, CoCrFeNi, and CoCrFeMnNi. The materials were exposed to air at ambient pressure and at a temperature of 800 • C for 150 min, their weight-gain due to oxidation was continuously monitored and the products of oxidation were subsequently characterized by XRD. The most common oxides formed have spinel or halite structure and the materials resistance to oxidation increases as: FeNi < CoFeNi < Ni < CoCrFeMnNi < CoCrFeNi. We found further that the oxidation-resistance of the materials does not correlate linearly with the number of elements present, instead the type of elements impacts significantly the materials susceptibility to oxidative damage. Cr is the element that imparted higher resistance to oxidation while Mn and Fe worsened the materials performance. In order to better understand the mechanisms of oxidation we employed thermodynamic equilibrium calculations and predicted the phase stability of oxides of the elements that are present in the materials, in different ranges of temperature, composition and oxygen activity. Additionally, we determined the phase compositions for the thermodynamically stable oxides at 800 • C. The results from the thermodynamic modeling are in good agreement with the experimental finds. The alloys with low resistance to oxidation such as CoFeNi and FeNi, form the Fe 3 O 4 spinel phase which tends to dominate the phase diagram for these materials. The presence of Cr increases the resistance to atomic rearrangement due to slow diffusion in the complex structure of Cr containing spinel phases. This causes the extremely high resistance to oxidation of the CoCrFeNi alloy. The presence of Mn in CoCrFeNi stabilizes the Mn 3 O 4 spinel, which reduces the oxidation-resistance of the alloys due to the high mobility of Mn.

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Section: Introductionmentioning

confidence: 95%

Nonlinear Oxidation Behavior in Pure Ni and Ni-Containing Entropic Alloys

et al. 2018

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“…[212] The addition of Si to AlTiCrNbMo refractory HEA resulted in a slight increase in the oxidation resistance. [54] The oxidation behavior of AlTiCrNbMo HEA showed the formation of porous and non-protective oxides scales, and the oxidation kinetics followed the linear rate law at 900 and 1000…”

Section: à3mentioning

confidence: 94%

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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“…One is the oxide inclusions formed during the thermal spraying process, and the other is the oxides formed by the oxidation of the metal phase during the wear test. Previous studies reported that the FeCoNiCr-M HEA alloys exhibited excellent oxidation resistance at high temperature due to the sluggish diffusion [49,50]. Furthermore, the oxide film was suggested to have a low rate of thickening and a high resistance to spallation.…”

Section: Tribological Behaviormentioning

confidence: 99%

Microstructure and Wear Behavior of FeCoCrNiMo0.2 High Entropy Coatings Prepared by Air Plasma Spray and the High Velocity Oxy-Fuel Spray Processes

Liu

et al. 2017

Coatings

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Abstract:In the present research, the spherical FeCoCrNiMo0.2 high entropy alloy (HEA) powders with a single FCC solid solution structure were prepared by gas atomization. Subsequently, the FeCoCrNiMo0.2 coatings with a different content of oxide inclusions were prepared by air plasma spraying (APS) and high-velocity oxy-fuel spraying (HVOF), respectively. The microstructure, phase composition, mechanical properties, and tribological behaviors of these HEA coatings were investigated. The results showed that both HEA coatings showed a typical lamellar structure with low porosity. Besides the primary FCC phase, a mixture of Fe 2 O 3 , Fe 3 O 4 , and AB 2 O 4 (A = Fe, Co, Ni, and B = Fe, Cr) was identified as the oxide inclusions. The oxide content of the APS coating and HVOF coating was calculated to be 47.0% and 12.7%, respectively. The wear resistance of the APS coating was approximately one order of magnitude higher than that of the HVOF coating. It was mainly attributed to the self-lubricated effect caused by the oxide films. The mass loss of the APS coating was mainly ascribed to the breakaway of the oxide film, while the main wear mechanism of the HVOF coating was the abrasive wear.

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High temperature oxidation behavior of an equimolar refractory metal-based alloy 20Nb 20Mo 20Cr 20Ti 20Al with and without Si addition

Cited by 171 publications

References 54 publications

Nonlinear Oxidation Behavior in Pure Ni and Ni-Containing Entropic Alloys

Nonlinear Oxidation Behavior in Pure Ni and Ni-Containing Entropic Alloys

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

Microstructure and Wear Behavior of FeCoCrNiMo0.2 High Entropy Coatings Prepared by Air Plasma Spray and the High Velocity Oxy-Fuel Spray Processes

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