Thermodynamic evaluation of the phase equilibria and glass-forming ability of the Al–Co–Gd system

Li, X.; Liu, L.B.; Jiang, Yi; Huang, Guanghui; Wang, X.; Jiang, Yuxun; Liang, Junbin; Zhang, L.G.; Shi, Xichang

doi:10.1016/j.calphad.2015.11.002

Cited by 9 publications

(4 citation statements)

References 22 publications

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“…similar microstructure was obtained for al-0.7 wt% co alloy castings [17]. The investigated alloys 03 and al-0.7% co are hypoeutectic, because according to the literature, the eutectic point occurs at 1.09% by weight of cobalt [9]. The average spacing between cell boundaries is 29.4 µm ± 3.7 µm.…”

Section: Resultssupporting

confidence: 76%

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Archives of Metallurgy and Materials

Koprowski

Lech-Grega

Wodziński

et al. 2021

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The effecT of 0.2% AddiTion of Mg, co And ce on MicrosTrucTure And MechAnicAl ProPerTies of 1xxx series AluMiniuM Alloy cAsTings designed for overheAd TrAnsMission linesThe effect of 0.2% addition of Mg, co and ce to 99.9% cast aluminium was studied by evaluation of changes in microstructure and mechanical properties. The microstructure was analyzed by scanning electron microscopy and transmission electron microscopy. The al99.9 alloy contained only al-Fe-si phase particles. similar al-Fe-si particles were observed in alloy with 0.2% Mg addition, because this amount of magnesium was fully dissolved in the solid solution. The addition of cobalt resulted in the formation of al 9.02 co 1.51 Fe 0.47 phase particles assuming the shape of eutectic plates. The electron backscattered diffraction map made for the alloy with 0.2% co addition showed numerous twin boundaries with distances between them in the range from 10 to 100 µm. The addition of cerium was located in the grain boundary area. cerium also gave rise to the formation of two types of particles, i.e. al 4 ce and al-ce-Fe-si. The al-ce-Fe-si phase is a nucleation site for the al 4 ce phase, which forms eutectic plates. The results showed that the introduction of additives increases the mechanical properties of the cast materials. The 99.9% cast aluminium has a hardness of 16.9 hB. The addition of 0.2% by weight of Mg, co, ce increases this hardness to 21.8 hB, 22.6 hB and 19.1 hB, respectively.

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Section: Resultssupporting

confidence: 76%

“…The increasing content of atoms in the solid solution causes an intense reduction in conductivity [8]. The al-co phase equilibrium system shows that al 9 co 2 appears as a eutectic [9,10]. This phase crystallizes in a monoclinic structure and has a favourable effect on mechanical properties [11].…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Koprowski

Lech-Grega

Wodziński

et al. 2021

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“…Several recent efforts have been focused on revisiting the Al-Co phase diagram (Figure 1b) [43][44][45]. [46,47] (Reprinted with permission from [46]. Copyright 2022, Springer Nature), (b) Revisited Al-Co equilibrium phase diagram [43,45,48]).…”

Section: Al-co Phase Constitutionmentioning

confidence: 99%

A Critical Review on Al-Co Alloys: Fabrication Routes, Microstructural Evolution and Properties

Sfikas

González

Lekatou

et al. 2022

Metals

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Al-Co alloys is an emerging category of metallic materials with promising properties and potential application in various demanding environments. Over the years, different manufacturing techniques have been employed to fabricate Al-Co alloys, spanning from conventional casting to rapid solidification techniques, such as melt spinning, thus leading to a variety of different microstructural features. The effect of the fabrication method on the microstructure is crucial, affecting the morphology and volume of the precipitates, the formation of supersaturated solid solutions and the development of amorphous phases. In addition, the alloy composition has an effect on the type and volume fraction of intermetallic phases formed. As a result, alloy properties are largely affected by the microstructural outcomes. This review focuses on highlighting the effect of the fabrication techniques and composition on the microstructure and properties of Al-Co alloys. Another goal is to highlight areas in the field that are not well understood. The advantages and limitations of this less common category of Al alloys are being discussed with the scope of future prospects and potential applications.

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“…VAM Al-Co alloys with Co in the range of 2-32 wt% Co (Al-Al 9 Co 2 ) exhibited directional microstructures, transitioning from eutectic to supereutectic with increasing Co content [4,18]. Notably, relatively high amounts of Co were found dissolved in the Al matrix (ranging from 0.5 wt% in Al-2 wt% Co to 5.5 wt% in Al-20 wt% Co) [4,19], despite the negligible Co solubility in Al under equilibrium conditions [20]. This was attributed to the high solidification rates involved in the fabrication process [19].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of As-Cast and Heat-Treated Al–Co Alloys in 3.5 wt% NaCl

Sfikas,

Lekatou,

Emmanouilidou

et al. 2024

Materials

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The present work evaluates the effect of Co content on the microstructure and corrosion performance of Al–Co alloys of various compositions (2–32 wt% Co), fabricated by flux-assisted stir casting. A preliminary investigation on the effect of heat treatment (600 °C, up to 72 h) on the microstructure and corrosion behavior of Al–20 wt% Co and Al–32 wt% Co was also conducted. The Al– (2–10) wt% Co alloys were composed of acicular Al9Co2 particles uniformly dispersed in an Al matrix. The Al–20 wt% Co and Al–32 wt% Co alloys additionally contained Al13Co4 blades enveloped in Al9Co2 wedges. Heat treatment of Al–20 wt% Co and Al–32 wt% Co led to a significant reduction in the volume fraction of Al13Co4 and a decrease in hardness. Al–Co alloys with high Co content (10–32 wt% Co) exhibited greater resistance to localized corrosion in 3.5 wt% NaCl, but lower resistance to general corrosion compared to the (0–5 wt% Co) alloys. Heat treatment led to a slight increase in the corrosion resistance of the Al–Co alloys. The microstructure of the produced alloys was analyzed and correlated with the corrosion performance. Finally, corrosion mechanisms were formulated.

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Thermodynamic evaluation of the phase equilibria and glass-forming ability of the Al–Co–Gd system

Cited by 9 publications

References 22 publications

Archives of Metallurgy and Materials

Archives of Metallurgy and Materials

A Critical Review on Al-Co Alloys: Fabrication Routes, Microstructural Evolution and Properties

Corrosion Behavior of As-Cast and Heat-Treated Al–Co Alloys in 3.5 wt% NaCl

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