首页|A new approach to determine/design the eutectic composition of binary, ternary, and high-entropy alloys using electromagnetic directional crystallization
A new approach to determine/design the eutectic composition of binary, ternary, and high-entropy alloys using electromagnetic directional crystallization
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NSTL
Elsevier
Eutectic materials have been widely employed in many high-tech fields, and recently, eutectic high-entropy alloys (EHEAs) have become a research focus of eutectic materials; however, it is challenging to determine/ design the eutectic composition of alloys accurately, especially multi-component alloys and EHEAs. In this study, a new electromagnetic directional crystallization approach was proposed to determine/design eutectic alloy compositions. First, standard eutectic Al-Si, Al-Si-Fe, Al-Si-Ti, and Al-Si-Fe-Mn alloys were obtained by directly separating their respective melts using electromagnetic directional crystallization. Then their eutectic compositions were accurately determined by inductively coupled plasma-optical emission spectroscopy. Conflicting reports about the eutectic reactions and phase transformations occurring in the Al-Si-Ti system were also resolved. Thereafter, the application of electromagnetic directional crystallization was extended to EHEAs. The widely investigated AlCoCrFeNi2.1 EHEA was confirmed to have a eutectic composition, and a new EHEA Al16.8Co12.6Cr13.8Fe11.8Ni45.1 with a combination of high strength and high ductility was obtained in this study by separating the AlCoCrFeNi3 melt via electromagnetic directional crystallization. Therefore, in the absence of thermodynamic data, electromagnetic directional crystallization provides a promising approach for determining and designing the eutectic composition of alloys, especially EHEAs. This new approach is more direct, efficient, and simpler than the conventional thermodynamiccalculation approach because the application of the latter is significantly limited when thermodynamic data are not available.
NSTL
Elsevier
