CrFeVWX (X = Ta or Ti) High-Entropy Alloy: A Theoretical and Experimental Comparative Investigation on Phase Stability
Ricardo Martins, Vasco Valadares, André Pereira, António P. Gonçalves, Filipe Neves, Ana Sá, Paulo Luz, Bernardo Monteiro, Andrei Galatanu, Judith Monnier, Benjamin Villeroy, Marta Dias
TL;DR
This study explores CrFeVWX high-entropy alloys for use in extreme environments like nuclear fusion reactors, comparing their stability and properties through simulations and experiments.
Contribution
The paper presents a comparative theoretical and experimental investigation of CrFeTaVW and CrFeTiVW high-entropy alloys for phase stability and performance.
Findings
Monte Carlo simulations predict lower potential energy and more stable structures for both alloys compared to Molecular Dynamics.
CrFeTaVW shows lower chemical segregation in Monte Carlo simulations, while CrFeTiVW shows the opposite trend.
Experimental results confirm bcc structures in both alloys, with CrFeTaVW also showing an Fe2Ta Laves phase.
Abstract
Materials capable of withstanding extreme environments open promising opportunities for nuclear fusion reactors. In this study, equiatomic CrFeTaVW and CrFeTiVW high-entropy alloys are investigated as interlayer materials between W and CuCrZr. Monte Carlo and Molecular Dynamics simulations predicted a bcc-type structure for both systems. Additionally, the Monte Carlo simulation predicts lower potential energy and a more stable structure for both systems than Molecular Dynamics. For CrFeTaVW, the chemical segregation values are lower in MC than in the MD simulation, whereas for CrFeTiVW, the opposite trend is observed, with MC indicating stronger segregation values. After simulation, the high-entropy alloys were prepared by planetary ball milling, consolidated by spark plasma sintering, and analyzed using X-ray diffraction, scanning electron microscopy, and thermal diffusivity. The…
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Taxonomy
TopicsHigh Entropy Alloys Studies · Additive Manufacturing Materials and Processes · Fusion materials and technologies