Accession Number : AD1041112


Title :   High Entropy Alloys: A Current Evaluation of Founding Ideas and Core Effects and Exploring Nonlinear Alloys (Postprint)


Descriptive Note : Journal Article - Open Access


Corporate Author : AFRL Materials and Manufacturing Directorate Wright Patterson Air Force Base United States


Personal Author(s) : Miracle,Daniel B


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1041112.pdf


Report Date : 29 Aug 2017


Pagination or Media Count : 21


Abstract : The burgeoning field of high-entropy alloys (HEAs) is underpinned by two foundational concepts, and early research has been motivated by several hypotheses known as core effects. The field is now entering its teenage years, and sufficient data have been collected to evaluate these hypotheses and to take a fresh look at the foundational concepts. Although recent assessments have concluded that two of the four HEA hypotheses are not supported by available data, new studies are already coming online to extend these analyses, and new interpretations are inspiring new directions for research within the field. This article gives an up-to-date evaluation of the HEA core effects and proposes nonlinear alloys as a new strategy to embrace the founding concept of compositional and microstructural vastness.


Descriptors :   crystal structure , solid solutions , transition metals , diffusion coefficient , thermodynamic properties , binary alloys , high temperature , refractory metals , crystal lattices , phase transformations


Distribution Statement : APPROVED FOR PUBLIC RELEASE