Characterization of non-metallic inclusions and their influence on the mechanical properties of a FCC single-phase high-entropy alloy

Choi, Nuri; Lim, Ka Ram; Na, Young Sang; Glatzel, Uwe; Park, Joo Hyun

doi:10.1016/j.jallcom.2018.05.339

Cited by 64 publications

(27 citation statements)

References 44 publications

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“…This type of the as-cast microstructure in the CoCrFeMnNi alloy was reported in a few earlier publications [10,40]. The presence of coarse (~3-5 μm) inclusions, identified as manganese sulfides (MnS) according to some earlier results [30,41], should be noted (Fig. 2d).…”

Section: Microstructuresupporting

confidence: 79%

Fatigue behaviour of a laser beam welded CoCrFeNiMn-type high entropy alloy

Kashaev

Ventzke

Petrov

et al. 2019

Materials Science and Engineering: A

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Section: Microstructuresupporting

confidence: 79%

Fatigue behaviour of a laser beam welded CoCrFeNiMn-type high entropy alloy

Kashaev

Ventzke

Petrov

et al. 2019

Materials Science and Engineering: A

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“…To summarize, the C and O contaminations in the HEA powders and the C diffusion from the sintering mold lead to the precipitation of Cr carbides and mixed Mn oxides. This is in agreement with previous studies on bulk CoCrFeMnNi Cantor alloy in which Cr carbides [34,35] and mixed Cr and Mn oxides were already observed [36].…”

Section: Sintering Of the Hea Powdersupporting

confidence: 93%

Microstructure and mechanical properties of a CoCrFeMnNi high entropy alloy processed by milling and spark plasma sintering

Laurent‐Brocq

Goujon

Monnier

et al. 2019

Journal of Alloys and Compounds

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Powder metallurgy is a promising processing path to produce high entropy alloys (HEA) with improved mechanical properties. According to this, a bulk CoCrFeMnNi alloy was milled with a wide range of conditions. It was shown that a powder which is micronic, approximately spherical and with nanometric crystallites could be produced by a cryo-milling which was followed by a short duration planetary milling. Next, this powder was fully densified by spark plasma sintering. According to X-ray diffraction, the single phase of the bulk alloy remains stable during both milling and sintering. However, carbides and oxides precipitate during sintering, as shown by scanning electron microscopy coupled with energy dispersive spectroscopy. Electron backscattered diffraction evidence that those precipitates limit the growth of grains. By nanoindentation measurements, it was shown that preparing a CoCrFeMnNi HEA by milling and sintering significantly increases the hardness compared to conventional processing by melting and casting. Moreover, the different strengthening contributions were calculated and analyzed. It revealed that grains have a strengthening contribution as described by the Hall & Petch law, contrary to crystallites.

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“…Licavoli et al [21] observed Al 2 O 3 and SiO 2 inclusions in a FeCrNiMnCo alloy produced by vacuum arc remelting (VAR), which contain 40-50 ppm oxygen and 200-250 ppm sulfur. The Mn-, Cr-, and Al-rich oxides were also observed in a FeCrNiMnCo alloy ingot produced by the VAR process in previous research by the present authors [36]. The formed inclusions act as void nucleation sites.…”

Section: Introductionsupporting

confidence: 81%

“…Here, the observation area was about 0.2 mm 2 for each specimen. The area fraction (AF) of inclusions was evaluated in the same way as performed in our previous study [36]. The number densities were 83, 101, and 102 per mm 2 for VC-HEA, AR-HEA, and AE-HEA, respectively.…”

Section: Characterization Of Non-metallic Inclusionsmentioning

confidence: 99%

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Influence of Manufacturing Conditions on Inclusion Characteristics and Mechanical Properties of FeCrNiMnCo Alloy

Choi

Park

Kim

et al. 2020

Metals

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Three CoCrFeMnNi high-entropy alloys (HEAs) were produced by vacuum induction melting, induction melting under inert gas atmosphere, and melting under inert gas atmosphere followed by air exposure, respectively. The different manufacturing conditions for the three investigated alloys resulted in different levels and types of inclusions. The alloys melted under vacuum or inert gas contained Al2O3 inclusions formed by impurity Al, due to its high oxidation tendency. The molten alloy exposed in air showed an excessive oxidation. During oxidation of the molten alloy in air, impurity Al was initially oxidized, and fine MnCr2O4 inclusions were formed rather than pure Al2O3 inclusions. This difference was analyzed based on thermodynamic calculations. Specifically, the influence of impurity content on the inclusion characteristics was investigated for the three HEAs. Moreover, the inclusion characteristics were found to have an influence on mechanical properties of the alloys also. In air-exposed HEA, smaller inclusions were formed, resulting in a higher dislocation density at the matrix/inclusion interface and thus strengthening of the HEA. Thus, it is proposed that atmospheric conditions could be an important factor to control the inclusion characteristics and to form fine inclusion particles, which could improve the mechanical properties of HEAs.

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Characterization of non-metallic inclusions and their influence on the mechanical properties of a FCC single-phase high-entropy alloy

Cited by 64 publications

References 44 publications

Fatigue behaviour of a laser beam welded CoCrFeNiMn-type high entropy alloy

Fatigue behaviour of a laser beam welded CoCrFeNiMn-type high entropy alloy

Microstructure and mechanical properties of a CoCrFeMnNi high entropy alloy processed by milling and spark plasma sintering

Influence of Manufacturing Conditions on Inclusion Characteristics and Mechanical Properties of FeCrNiMnCo Alloy

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