Abstract
The present Viewpoint set aims at providing a summary of the recent advancements in the fundamental understanding of high entropy alloys (HEAs) as well as igniting new ideas and activities in this rapidly evolving field of use-inspired basic research. The universality of the core effects in HEAs, ranging from configurational entropy contributions to cocktailing effects are still under a passionate debate and in particular the peer-reviewed articles are meant to provide original perspectives. The various contributions are strongly opinion-based in a variety of areas including diffusion, phase transformations, deformation behavior, corrosion, metastability, structural as well as functional properties. In addition, the impact of the original metallic HEAs onto the field of oxides and ceramics has been illustrated and the role of entropy in high-entropy oxides is critically discussed.
Highlights
The present Viewpoint set aims at providing a summary of the recent advancements in the fundamental understanding of high entropy alloys (HEAs) as well as igniting new ideas and activities in this rapidly evolving field of use-inspired basic research
It should be realized that the theoretical feasibility of such a counterintuitive alloy design of HEAs stems from the concept of entropic stabilization, wherein large number of elements would raise the configurational entropy contribution of the solution state in lowering the Gibbs free energy
Further studies with improved and experimentally validated isothermal TTT diagrams should be carried out to manifest the effect of temperature and time on phase transformations at various time and length scales. Another key issue is related to the fact that the classical definition of defects and their impact on structure-property relationships does not seem to be applicable for high entropy alloys
Summary
The present Viewpoint set aims at providing a summary of the recent advancements in the fundamental understanding of high entropy alloys (HEAs) as well as igniting new ideas and activities in this rapidly evolving field of use-inspired basic research. The universality of the core effects in HEAs, ranging from configurational entropy contributions to cocktailing effects are still under a passionate debate and in particular the peer-reviewed articles are meant to provide original perspectives.
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