Thermodynamics‐Guided High‐Throughput Discovery of Eutectic High‐Entropy Alloys for Rapid Solidification
Journal
Advanced Science
ISSN
2198-3844
2198-3844
Date Issued
2024-06-18
Author(s)
Liuliu Han
Zhongji Sun
Wenzhen Xia
Xukai Zhang
Jing Rao
Pei Wang
Andrew Chun Yong Ngo
Zhiming Li
Yong Liu
Dierk Raabe
DOI
10.1002/advs.202401559
Abstract
Excellent castability, significantly refined microstructure, and good mechanical properties make eutectic high-entropy alloys (EHEAs) a natural fit for rapid solidification processes, e.g., additive manufacturing. Previous investigations have focused on developing EHEAs through trial and error and mixing known binary eutectic materials. However, eutectic compositions obtained from near-equilibrium conditions do not guarantee a fully eutectic microstructure under rapid solidifications. In this work, a thermodynamically guided high-throughput framework is proposed to design EHEAs for rapid solidification. Empirical formulas derived from past experimental observations and thermodynamic computations are applied and considered phase growth kinetics under rapid solidification (skewed phase diagram). The designed alloy candidate, Co25.6Fe17.9Ni22.4Cr19.1Ta8.9Al6.1 (wt.%), contains nanostructured eutectic lamellar and shows a high Vickers hardness of 675 Hv. In addition to this specific composition, the alloy design toolbox enables the development of new EHEAs for rapid solidification without the limitation of previous knowledge.
Subjects
additive manufacturing
alloy design
eutectic high-entropy alloy
rapid solidification
SDGs
Publisher
Wiley
Type
journal article