JOM

, Volume 64, Issue 7, pp 830–838 | Cite as

Alloy Design and Properties Optimization of High-Entropy Alloys

Article

Abstract

This article reviews the recent work on the high-entropy alloys (HEAs) in our group and others. HEAs usually contain five or more elements, and thus, the phase diagram of HEAs is often not available to be used to design the alloys. We have proposed that the parameters of δ and Ω can be used to predict the phase formation of HEAs, namely Ω ≥ 1.1 and δ ≤ 6.6%, which are required to form solid-solution phases. To test this criterion, alloys of TiZrNbMoVx and CoCrFeNiAlNbx were prepared. Their microstructures mainly consist of simple body-centered cubic solid solutions at low Nb contents. TiZrNbMoVx alloys possess excellent mechanical properties. Bridgman solidification was also used to control the microstructure of the CoCrFeNiAl alloy, and its plasticity was improved to be about 30%. To our surprise, the CoCrFeNiAl HEAs exhibit no apparent ductile-to-brittle transition even when the temperatures are lowered from 298 K to 77 K.

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Copyright information

© TMS 2012

Authors and Affiliations

  1. 1.High-Entropy Theory Center, State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijingChina
  2. 2.Department of Materials Science and EngineeringUniversity of TennesseeKnoxvilleUSA

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