Microstructure Evolution and Corrosion Behavior of Directionally Solidified FeCoNiCrCu High Entropy Alloy

Cui, Hongbao; Zheng, Li; Wang, Jin Yong

doi:10.4028/www.scientific.net/amm.66-68.146

Cited by 22 publications

(7 citation statements)

References 3 publications

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“…The SFE of Cu along the {111} plane is 39 mJ/m 2 , in good agreement with the value reported in literature (41 mJ/m 2 , [26]). Now we start to investigate the SFE of HEA FeCoNiCrCu, which is believed to be FCC phase at room temperature [27,28]. It has 5 types of atoms and the numbers of each type were set as 38, 39, 38, 38, and 39 for Fe, Co, Ni, Cr, Cu, in turn.…”

Section: Calculation Detailsmentioning

confidence: 99%

The Gaussian distribution of lattice size and atomic level heterogeneity in high entropy alloys

Liu

Wei

2017

Extreme Mechanics Letters

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It has been shown that heterogeneity at the micro-structure level can effectively enhance the strength and ductility of materials. Here we demonstrate via density-functional theory calculations that high entropy alloys (HEAs) exhibit atomic level heterogeneity in bond length and stacking fault energy (SFE) which could lead to HEAs' excellent hardenability and deformability. The bond length of HEA FeCoNiCrCu follows a Gaussian distribution, in contrast to the single-valued SFE and bond length in conventional crystalline counterparts. Its SFEs also fall into a wide span, which could introduce sequential and dispersed nucleation of different plastic sources including phase transformation, deformation twinning, and dislocations, giving rise to their exceptionally high hardenability and ductility. The atomic level heterogeneity in HEAs further gives rise to solid solution strengthening during dislocation motion. The concept of making atomic level heterogeneity can also be utilized in other metallic alloys for better hardenability and ductility.

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Section: Calculation Detailsmentioning

confidence: 99%

The Gaussian distribution of lattice size and atomic level heterogeneity in high entropy alloys

Liu

Wei

2017

Extreme Mechanics Letters

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“…Additionally, the authors concluded that Mo additions decreased the corrosion resistance of the alloys in a 1 M NaOH solution [24]. Cui et al [25] also confirmed that because they were easily being passivated, the directionally solidified FeCoNiCrCu HEAs were more corrosion-resistant than the as-cast FeCoNiCrCu HEAs in a 3.5 at. % NaCl solution.…”

Section: Introductionmentioning

confidence: 93%

“…% [1][2][3][4]. Many researchers have contributed their efforts to understanding the fabrication, composition, microstructure, and properties of more than 400 HEAs to date [5][6][7][8][9][10][11][12], where the CoCrFeNi system HEAs have been heavily researched, and many studies in the literature have focused on improving the corrosion resistance of CoCrFeNi system HEAs through the addition of other alloy elements, such as Al, Mn, Mo, Cu, and Ti [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. Kao et al [14] investigated the electrochemical passive properties of AlxCoCrFeNi alloys by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and weight loss tests, indicating that a higher amount of Al in AlxCoCrFeNi alloys was harmful to the corrosion resistance in a 0. solution, and the pitting potentials of Al0.5CrFe1.5MnNi0.5 HEAs were significantly lower than those of Al-free CrFe1.5MnNi0.5 HEAs in a 1 M NaCl solution [15].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of AlFeCrCoNiZrx High-Entropy Alloys in 0.5 M Sulfuric Acid Solution

Yu-hong

Jin

Gao

et al. 2021

Metals

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AlCoCrFeNiZrx (x = 0, 0.1, 0.2, 0.3, and 0.5) high-entropy alloys (HEAs) were prepared by a non-consumable vacuum arc melting technology, and the microstructure and corrosion behavior were investigated by XRD, SEM, immersion tests, and electrochemical measurements. The results indicate that galvanic corrosion of the AlCoCrFeNiZrx alloys occurred in 0.5 M H2SO4 solution, and only 0.1 mol of the added Zr could greatly improve the corrosion resistance of the alloys. The corrosion properties of the AlCoCrFeNiZrx HEAs had similar change tendencies with the increase in the Zr content in the immersion tests, potentiodynamic polarization measurements, and electrochemical impedance analysis, that is, the corrosion resistance of the AlCoCrFeNiZrx alloys in a 0.5 M H2SO4 solution first increased and then decreased with the increase in the Zr content. The Zr0.1 alloys were found to have the best selective corrosion and general corrosion resistance with the smallest corrosion rate, whereas the Zr0.3 alloys presented the worst selective corrosion and general corrosion resistance with the highest corrosion rate from both the immersion tests and the potentiodynamic polarization measurements.

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“…YMK yapının oluşumu ikili bileşenlerin YMK yapıda kristalleşmesi durumunda kolaylaşmaktadır. Örneğin AlCoCrFeNi alaşımı A2+B2 yapısı gösterirken Al yerine alaşımda Cu bulunduğunda YMK yapı oluşmaktadır [43,44]. Bu alaşımda CoNi, CoFe, CuNi, CuCo ve FeNi ikililerinin hepsi YMK yapıdadır ve böylece YMK fazı kararlı hale getirir.…”

Section: Yüksek Entropili Alaşımlarda Katı Eriyiklerunclassified

Yüksek Entropi̇li̇ Alaşimlar: Prensi̇pler Ve Alaşim Tasarimi

Erdoğan

Zeytin²

2019

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

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ÖZÇoğu geleneksel alaşım tek bir element üzerinde kurulmaktadır. Farklı türlerdeki alaşım elementleri bu ana element üzerine özellikleri geliştirmek amacıyla eklenir ve böylece tek bir ana element üzerinde dayanan alaşım aileleri oluşturulur. Yüksek entropili alaşımlarda farklı olarak alaşımlar beş veya daha fazla ana element içerirler.Yüksek entropi kavramı, sadece bir baskın öğeye dayanan klasik alaşımlama yaklaşımı ile elde edilemeyen benzersiz özelliklere sahip gelişmiş malzemeler geliştirmenin yeni bir yolunu ortaya koymaktadır. Bu makale, çekirdek etkileri, fazlar ve kristal yapıları, mekanik özellikler, notasyon ve üretim teknikleri de dahil olmak üzere YEA'ların bazı önemli yönlerini açıklamaktadır. Anahtar kelimeler:Yüksek entropili alaşımlar, metaller ve alaşımlar, entropi, entalpi, katı eriyik ABSTRACT Most conventional alloys are based on one principal element. Different types of alloying elements are added to the principal element to improve its properties, forming an alloy family based on the principal element. Unlike this, High-entropy alloys (HEAs) are alloys with five or more principal elements. The concept of high entropy introduces a new way of developing advanced materials with unique properties that cannot be achieved by a classical alloying approach based on one dominant element. This paper describes some important aspects of HEAs including core effects, phases and crystal structures, mechanical properties, notations, process techniques.

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Microstructure Evolution and Corrosion Behavior of Directionally Solidified FeCoNiCrCu High Entropy Alloy

Cited by 22 publications

References 3 publications

The Gaussian distribution of lattice size and atomic level heterogeneity in high entropy alloys

The Gaussian distribution of lattice size and atomic level heterogeneity in high entropy alloys

Corrosion Behavior of AlFeCrCoNiZrx High-Entropy Alloys in 0.5 M Sulfuric Acid Solution

Yüksek Entropi̇li̇ Alaşimlar: Prensi̇pler Ve Alaşim Tasarimi

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