Processing of a single-crystalline CrCoNi medium-entropy alloy and evolution of its thermal expansion and elastic stiffness coefficients with temperature

Laplanche, Guillaume; Schneider, Mike; Scholz, F.; Frenzel, Jan; Eggeler, Gunther; Schreuer, J.

doi:10.1016/j.scriptamat.2019.09.020

Cited by 50 publications

(10 citation statements)

References 37 publications

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“…While the yield stress and ductility remain roughly constant between 200 and 1000 °C, the ultimate tensile strength further decreases from 500 to 100 MPa. Later on, Wu et al [6] reported that among the equiatomic subsystems of the CrMn-FeCoNi alloy that are single-phase fcc, the CrCoNi MEA exhibits the best mechanical properties, even superior to those of the equiatomic CrMnFeCoNi HEA [6,9,10]. In particular, at 800 °C (corresponding to the oxidation temperature of the present study) and for an alloy grain size of ~ 50 µm, the yield stress and the ultimate tensile strength of CrCoNi are almost twice as high as those of the CrMnFeCoNi HEA.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Oxidation in Dry and Humid Atmospheres of the Equiatomic CrMnFeCoNi and CrCoNi High- and Medium-Entropy Alloys

et al. 2020

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Surface degradation phenomena of two model equiatomic alloys from the CrMnFeCoNi alloy system were investigated in 2% O2 and 10% H2O (pO2 = 0.02 and 10−7 atm, respectively) at 800 °C for times up to 96 h. The crystallographic structures, morphologies, and chemical compositions of the corrosion layers developing on CrMnFeCoNi and CrCoNi were comparatively analyzed by mass gain analysis, X-ray diffraction, and scanning electron microscopy combined with energy-dispersive X-ray spectroscopy and electron backscatter diffraction. The oxidation resistance of CrMnFeCoNi is relatively poor due to the fast growth of porous Mn-oxide(s). CrCoNi forms an external chromia layer that is dense and continuous in a dry 2% O2 atmosphere. This layer buckles and spalls off after exposure to 10% H2O atmosphere. Beneath the chromia layer, a Cr-depleted zone forms in the CrCoNi alloy in both environments. As the oxide scale spalls off in the H2O-containing atmosphere, a secondary chromia layer was observed and correspondingly enlarges the Cr-depleted zone. In contrast, as the chromia layer remains without significant spallation when CrCoNi is exposed to a dry oxidizing atmosphere, the region depleted in Cr is narrower. Graphic Abstract

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Section: Introductionmentioning

confidence: 99%

High-Temperature Oxidation in Dry and Humid Atmospheres of the Equiatomic CrMnFeCoNi and CrCoNi High- and Medium-Entropy Alloys

et al. 2020

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“…The backscattered electron (BSE) images were taken using a Quanta FEI 650 scanning electron microscope (SEM) with an accelerating voltage of 20 kV and a working distance between ∼5 and 10 mm, for more details see Ref. [2]. The mean prior grain size ( d ) in Table 2 was determined using the Heyn linear intercept method outlined in ASTM E−112, see Ref.…”

Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

Data regarding the influence of Al, Ti, and C additions to as-cast Al0.6CoCrFeNi compositionally complex alloys on microstructures and mechanical properties

et al. 2019

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This brief paper contains raw data of X-ray diffraction (XRD) measurements, microstructural characterization, chemical compositions, and mechanical properties describing the influence of Al, Ti, and C on as-cast Al0.6CoCrFeNi compositionally complex alloys (CCAs). The presented data are related to the research article in reference [1] and therefore this article can be referred to as for the interpretation of the data. X-ray diffraction data presented in this paper are measurements of 2θ versus intensities for each studied alloy. A Table lists the obtained lattice parameters of each identified phase determined by Rietveld analysis. Microstructural-characterization data reported here include backscattered electron (BSE) micrographs taken at different magnifications in a scanning electron microscope (SEM) of Widmanstätten and dendritic microstructures and microstructural parameters such as phase volume fractions, thickness of face-centered cubic (FCC) plates, and prior grain sizes. The compositions of the identified individual phases determined by energy-dispersive X-ray spectroscopy (EDX) in the transmission electron microscope (TEM) are listed as well. Finally, mechanical data including engineering stress-strain curves obtained at different temperatures (room temperature, 400 °C, and 700 °C) for all CCAs are reported.

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“…Since 2004, high- and medium-entropy alloys (HEAs and MEAs) have attracted tremendous attention in various scientific fields [1] , [13] , [2] , [3] , [4] , [5] , [6] , [7] , [8] , [9] , [10] , [11] , [12] , [14] . However, the corresponding research data are not systematically reported in the literature, precluding data mining for further alloy development.…”

Section: Data Descriptionmentioning

confidence: 99%

Data compilation regarding the effects of grain size and temperature on the strength of the single-phase FCC CrFeNi medium-entropy alloy

Schneider

Laplanche

2021

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Processing of a single-crystalline CrCoNi medium-entropy alloy and evolution of its thermal expansion and elastic stiffness coefficients with temperature

Cited by 50 publications

References 37 publications

High-Temperature Oxidation in Dry and Humid Atmospheres of the Equiatomic CrMnFeCoNi and CrCoNi High- and Medium-Entropy Alloys

High-Temperature Oxidation in Dry and Humid Atmospheres of the Equiatomic CrMnFeCoNi and CrCoNi High- and Medium-Entropy Alloys

Data regarding the influence of Al, Ti, and C additions to as-cast Al0.6CoCrFeNi compositionally complex alloys on microstructures and mechanical properties

Data compilation regarding the effects of grain size and temperature on the strength of the single-phase FCC CrFeNi medium-entropy alloy

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