Exploration and Development of High Entropy Alloys for Structural Applications

By Daniel B. Miracle, Jonathan D. Miller, Oleg N. Senkov, Christopher Woodward, Michael D. Uchic, Jaimie Tiley. Entropy, 2014

892 citations recorded by the source corpus.

We develop a strategy to design and evaluate high-entropy alloys (HEAs) for structural use in the transportation and energy industries. We give HEA goal properties for low (≤150 °C), medium (≤450 °C) and high (≥1,100 °C) use temperatures. A systematic design approach uses palettes of elements chosen to meet target properties of each HEA family and gives methods to build HEAs from these palettes. We show that intermetallic phases are consistent with HEA definitions, and the strategy developed here includes both single-phase, solid solution HEAs and HEAs with intentional addition of a 2nd phase for particulate hardening. A thermodynamic estimate of the effectiveness of configurational entropy to suppress or delay compound formation is given. A 3-stage approach is given to systematically screen and evaluate a vast number of HEAs by integrating high-throughput computations and experiments. CALPHAD methods are used to predict phase equilibria, and high-throughput experiments on materials libraries with controlled composition and microstructure gradients are suggested. Much of this evaluation can be done now, but key components (materials libraries with microstructure gradients and high-throughput tensile testing) are currently missing. Suggestions for future HEA efforts are given.

Subfields: Aerospace Engineering, Biomedical Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/d907d9d31d3a2decf87c861171f11d8b8ca92cb4

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Citations in the corpus

Five decades of research on the development of eutectic as engineering materials (2021, background): “26 lead to high creep resistance, microstructural and thermal stability at high temperature and can be used as potential candidates for structural applications [219].”
High-entropy alloys fabricated via powder metallurgy. A critical review (2019, background): “The highest strength conventional metals and alloys used at high temperatures almost always rely on the controlled distribution of a second phase [16].”
Hume-Rothery for HEA classification and self-organizing map for phases and properties prediction (2017, methodology): “The CALPHAD approach has been widely used to achieve an understanding of phase stability and phase relationships [3,7,8,17-20].”
The effect of carbon on the microstructures, mechanical properties, and deformation mechanisms of thermo-mechanically treated Fe 40.4 Ni 11.3 Mn 34.8 Al 7.5 Cr 6 high entropy alloys (2017, neutral): “The precipitation of intermetallic particles is also a promising way to strengthen HEAs [7].”