Incorrect predictions of simple solid solution high entropy alloys: Cause and possible solution

One of the key issues in high-entropy alloys (HEAs) is the development of alloys that contains only simple solid solution (SSS) phases. Researchers have proposed various parametric models to predict SSS formation. However, incorrect predictions are not uncommon. Here, we investigate the main cause of these mispredictions. It is found that the premises of most existing models do riot apply to some intermetallic phases. Hence, the models cannot distinguish alloys containing these intermetallics from alloys containing only SSSs. A possible solution to this issue is proposed. With this strategy, the accuracy of existing models can be evidently improved. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.