Experimental investigation of the Al–Co–Fe phase diagram over the whole composition range

Zhu, Lilong; Soto-Medina, Sujeily; Hennig, Richard G.; Manuel, Michele V.

doi:10.1016/j.jallcom.2019.152110

Cited by 16 publications

(15 citation statements)

References 46 publications

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“…As exhibited in Figure 6 (a), the as-spun completely amorphous Al 86 Ce 10 Fe 4 alloy starts precipitating nanocrystalline nuclei of (fcc-Al+Al 11 Ce 3 +Al 5 Fe 2 +Al 13 Fe 5 ) among which the nuclei of Al 13 Fe 5 grow fast at the first onset crystallization temperature 304°C (577K). The precipitated nuclei include fcc-Al (Fm-3m, a=0.405 nm), Al 11 Ce 3 (Immm, a=0.440 nm, b=1.303 nm, c=1.009 nm), Al 5 Fe 2 (Cmcm, a=0.766 nm, b=0.642 nm, c=0.422 nm) and Al 13 Fe 5 (C2/m, a=1.549 nm, b=0.808 nm, c=1.247 nm, β=108.03°) [33][34][35][36][37][38]. All Fe atoms in the alloy are consumed in combining with Al and forming Al 5 Fe 2 and Al 13 Fe 5 nanocrystalline precipitates at this temperature due to the limited concentration of Fe (4 at.%) in the alloy.…”

Section: Discussionmentioning

confidence: 99%

Crystallization, mechanical and electrochemical behavior of Al-Ce-TM (TM = Fe, Co, Ni and Cu) amorphous alloys

2019

IJNN

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Al86Ce10TM4 amorphous alloys (TM=Fe, Co, Ni and Cu) were fabricated using melt-spin fast-quenching method. The crystallization, mechanical and electrochemical behavior of the as-spun and the post-annealed alloys were investigated by X-ray diffraction (XRD), differential scanning calorimetry (DSC), micro-indentation and electrochemical techniques. It was found the completely amorphous Al86Ce10TM4 alloys (TM=Fe, Co, Ni and Cu) go through two crystallization processes, where the first exothermal peak represents nucleation of nano-crystalline particles and the second exothermal peak signifies growth of the nano-crystalline precipitates. Both the nucleation and growth processes rely on diffusion-controlled mechanism. The first onset crystallization temperature Tx1 associated with activation energy E1 and frequency factor Ko1 can be used to evaluate the thermal stability of the amorphous alloys while the second onset crystallization temperature Tx2 associated with activation energy E2 and frequency factor Ko2 can be taken to judge the thermal stability of ideal amorphous-nanocrystalline mixed structure in sustaining optimized mechanical and electrochemical properties. The as-spun and post-annealed alloys exhibit higher mechanical hardness (860~1180 MPa), corrosion resistance (10-8A/cm2 ) and high temperature endurance (284, 300 and 420°C for Al86Ce10Co4 , Al86Ce10Ni4 andAl86Ce10Fe4 , respectively) compared to hardness 500~600 MPa, corrosion resistance 10-7A/cm2 and high temperature durability 200°C of traditional Al crystalline alloys, manifesting the value on scientific studies and engineering applications of the Al86Ce10TM4 amorphous alloys.

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Section: Discussionmentioning

confidence: 99%

Crystallization, mechanical and electrochemical behavior of Al-Ce-TM (TM = Fe, Co, Ni and Cu) amorphous alloys

2019

IJNN

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“…The eutectic lines for these systems are obtained by following procedures. For Al-Co-Fe system the minimum eutectic composition is reported to be Al15Co63Fe22 at% [31][32]. Therefore, it is assumed that a straight eutectic line exists between the eutectic composition Al20Co80 [34] and Al15Co63Fe22 [31][32] (Figure 1d).…”

Section: Model Developmentmentioning

confidence: 99%

“…For Al-Co-Fe system the minimum eutectic composition is reported to be Al15Co63Fe22 at% [31][32]. Therefore, it is assumed that a straight eutectic line exists between the eutectic composition Al20Co80 [34] and Al15Co63Fe22 [31][32] (Figure 1d). For Al-Co-Cr system neither a liquidus projection nor a minimum eutectic composition is reported.…”

Section: Model Developmentmentioning

confidence: 99%

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confidence: 99%

“…The eutectic lines for (a) Al-Co-Ni[29][30], (b) Al-Fe-Ni[26], (c) Al-Cr-Ni[27][28], (d) Al-Co-Fe, and (e) Al-Co-Cr and systems. For Al-Co-Fe system the eutectic line is drawn between the minimum eutectic composition Al15Co63Fe22[31][32] and eutectic composition Al20Co80[34]. For Al-Co-Cr system the eutectic line is drawn according the boundaries of γ + B2 region at 1300 °C [33] Proposing a network or graph structure for some of the binary, ternary, quaternary and quinary eutectic alloys in Al-Co-Cr-Fe-Ni system; each line in the network represents a eutectic line and dashed lines show eutectic lines which are not verified by experiments; as an example, the above network shows that eutectic Al23Co7Ni70 is made by adding Ni to Al20Co80 The concept of eutectic lines between eutectic alloys in quinary Al-Co-Cr-Fe-Ni system…”

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Design of Eutectic High Entropy Alloys in Al–Co–Cr–Fe–Ni System

Shafiei

2020

Met. Mater. Int.

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In the present work, a simple approach is proposed for predicting the compositions of eutectic high entropy alloys (EHEAs) in Al-Co-Cr-Fe-Ni system. It is proposed that eutectic lines exist between certain eutectic alloys in this system and, as a result, new eutectic or near-eutectic compositions can be obtained by mixing the alloys which are located on the same eutectic line. The approach is applied for a series of experimentally verified eutectic alloys and new eutectic or near-eutectic alloys are designed for Al-Co-Cr-Fe-Ni system. Furthermore, by investigating the compositions of verified eutectic alloys in Al-Co-Cr-Fe-Ni system, compositional diagrams are proposed which show the relations between the concentrations of constituent elements in eutectic alloys. The compositional diagrams suggest that EHEAs are derived from binary and ternary eutectic alloys.Moreover, the proposed diagrams can be considered as convenient methods for evaluating the composition of EHEAs in Al-Co-Cr-Fe-Ni system.

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Thermodynamic and diffusion kinetic studies of the Co-Al–Fe system

Wang

Zheng

2022

J Mater Sci

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Experimental investigation of the Al–Co–Fe phase diagram over the whole composition range

Cited by 16 publications

References 46 publications

Crystallization, mechanical and electrochemical behavior of Al-Ce-TM (TM = Fe, Co, Ni and Cu) amorphous alloys

Crystallization, mechanical and electrochemical behavior of Al-Ce-TM (TM = Fe, Co, Ni and Cu) amorphous alloys

Design of Eutectic High Entropy Alloys in Al–Co–Cr–Fe–Ni System

Thermodynamic and diffusion kinetic studies of the Co-Al–Fe system

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