High-Entropy Alloys – A New Era of Exploitation

By Jien‐Wei Yeh, Yu Chen, Su-Jien Lin, Swe-Kai Chen. 2007

578 citations recorded by the source corpus.

A high-entropy alloy (HEA) has been defined by us to have at least five principal elements, each of which has an atomic concentration between 5% and 35%. In the exploration on this new alloy field, we find that HEAs are quite simple to analyze and control, and they might be processed as traditional alloys. There exist many opportunities to create novel alloys, better than traditional ones in a wide range of applications. In this paper, we review the basic microstructural features of HEAs and discuss the mechanisms of formation. Instead of multiple intermetallic phases, the HEAs tend to form simple solid solution phases mainly of cubic crystal structure, especially at elevated temperatures. This tendency is explained by the high entropy effect based on the simple relation: (Gmix = (Hmix – T(Smix, and the second law of thermodynamics. Moreover, nanostructures and amorphous phases are easily formed in HEAs. This tendency is explained by kinetics theory as due to slow atomic diffusion.

Subfields: Aerospace Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/e28af13efeafc6b47674bc228ed67d1e843abe62

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Citations in the corpus

From high-entropy ceramics to compositionally-complex ceramics: A case study of fluorite oxides (2019, unknown): “61R) alloys [29].”
Review of Recent Research on AlCoCrFeNi High-Entropy Alloy (2021, background): “The concentration of each component of the alloy should vary between 5 and 35 at% [20,21].”
Experimental and theoretical study of Ti20Zr20Hf20Nb20X20 (X = V or Cr) refractory high-entropy alloys (2014, unknown): “HEAs are composed of equiatomic or nearly equiatomicmetallic elements, wherein themixing entropy is maximized, leading to the extended solid solubility and formation of a single or a double-phase structure [1,6,7].”