Diffusion behavior of Cr diluted in bcc and fcc Fe: Classical and quantum simulation methods

Ramunni, V.P.; Rivas, Alejandro Mariano Fidel

doi:10.1016/j.matchemphys.2015.06.040

Cited by 12 publications

(2 citation statements)

References 38 publications

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“…While the involvement of B2 phases in the alloy increases the alloy strength [16,26], FCC provides alloy ductility [11,16]. In addition, this phase has higher ∆H v f and ∆H v m [42] compared with that of BCC phase, and this makes the substitution diffusion in FCC phase lower than in BCC phase. Therefore, even though Cr acts as the strong element to increase the driving force for sigma phase formation [43], the existence of FCC forming elements such as Ni in Al 0.75 CoCrFeNi HEA can reduce the possibility for the sigma phase to occur [44].…”

Section: Empirical Approach Using Hume Rothery Lawmentioning

confidence: 99%

High-Temperature Oxidation and Microstructural Changes of Al0.75CoCrFeNi High-Entropy Alloy at 900 and 1100 °C

Korda,

Akbar,

Muhammad

et al. 2023

Metals

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The development of high-entropy alloys (HEAs) for high-temperature applications has been driven by the limitation of nickel-based superalloys in achieving optimal efficiency at higher temperatures for higher efficiency in power generation engines. The alloys must have high oxidation resistance and microstructural stability at high temperatures. Relatively equimolar multi elements involved in HEAs produce microstructure containing a single solid solution or multiphase that improves the mechanical properties and oxidation resistance resulting from sluggish diffusion and core effects. In this study, the oxidation behavior and microstructural changes of Al0.75CoCrFeNi HEA at 900, 1000, and 1100 °C in air atmosphere were investigated. Based on the XRD and SEM-EDS analysis, the mechanism of oxide scale formation and microstructural changes of the substrate are proposed. The results show that the oxidation behavior of the alloy follows a logarithmic rate law. Different oxide compounds of CoO, NiO, Cr2O3, and CrO3, θ-Al2O3, α-Al2O3, and Ni(Cr,Al)2O4 with semicontinuous oxides of Al2O3 with Cr2O3 subscale and an oxide mixture consisting of spinel of Ni(Cr,Al)2O4 and Co(Cr,Al)2O4 were found. During oxidation, Widmanstätten of FCC-A1 and BCC-B2/A2 phases in the substrate have changed. Spheroidization of B2 and a reduction in volume fraction decrease the hardness of the substrates.

show abstract

Section: Empirical Approach Using Hume Rothery Lawmentioning

confidence: 99%

High-Temperature Oxidation and Microstructural Changes of Al0.75CoCrFeNi High-Entropy Alloy at 900 and 1100 °C

Korda,

Akbar,

Muhammad

et al. 2023

Metals

View full text Add to dashboard Cite

show abstract

“…where evac is the formation energy of a vacancy in pure bcc iron (4.166 × 10 −19 J [226]), NA is Avogadro's number (6×10 23 mol -1 ) and M is the molar mass (56.2 g/mol). Using Eq.…”

Section: Chaptermentioning

confidence: 99%

Microstructure and Mechanical Performance of Ultrafine-grained Titanium and 316L Stainless Steel Processed by Severe Plastic Deformation

El-Tahawy¹

2018

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Significant change of local atomic configurations at surface of reduced activation Eurofer steels induced by hydrogenation treatments

Greculeasa

Palade

Schinteie

et al. 2017

Applied Surface Science

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Diffusion behavior of Cr diluted in bcc and fcc Fe: Classical and quantum simulation methods

Cited by 12 publications

References 38 publications

High-Temperature Oxidation and Microstructural Changes of Al0.75CoCrFeNi High-Entropy Alloy at 900 and 1100 °C

High-Temperature Oxidation and Microstructural Changes of Al0.75CoCrFeNi High-Entropy Alloy at 900 and 1100 °C

Microstructure and Mechanical Performance of Ultrafine-grained Titanium and 316L Stainless Steel Processed by Severe Plastic Deformation

Significant change of local atomic configurations at surface of reduced activation Eurofer steels induced by hydrogenation treatments

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