High-Entropy Alloys – A New Era of Exploitation

Jien Wei Yeh; Yu Liang Chen; Su Jien Lin; Swe Kai Chen

doi:10.4028/www.scientific.net/MSF.560.1

Paper Titles

High-Entropy Alloys – A New Era of Exploitation
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Effect of Fast Annealing on Microstructure and Mechanical Properties of Non-Oriented Al-Si Low C Electrical Steels
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Self-Affine Quasi-Static Fracture of Soda-Lime Glass
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Thermal Analysis and Microstructure Comparison Between A356 Aluminum Alloy and A356/15%vol. SiC_P Cast Composite Modified with Strontium
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HomeMaterials Science ForumMaterials Science Forum Vol. 560High-Entropy Alloys – A New Era of Exploitation

High-Entropy Alloys – A New Era of Exploitation

Abstract:

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.

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Periodical:

Materials Science Forum (Volume 560)

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1-9

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.560.1

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Online since:

November 2007

Authors:

Jien Wei Yeh, Yu Liang Chen, Su Jien Lin, Swe Kai Chen

Keywords:

Amorphous Phase, High Entropy Alloy, High-Entropy Effect, Nanostructure

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