Fundamental Understanding and Applications of High-Entropy Alloys

Date: October 25, 2018

Time: 12:00PM - 01:30PM

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High entropy alloys (HEAs) and the more broadly defined multi-principal-elements alloys (MPEAs) represent a major paradigm shift in alloy design. HEAs focus on the compositions near the center of a multicomponent phase diagram. By contrast, traditional alloys focus compositions on the boundaries (vertices, edges, or faces) of a phase diagram and typically consist of one principal element. Therefore, HEAs represent a tremendously vast compositional space that is largely unexplored by science. As an emerging field, research on HEAs has attracted rising worldwide attention and interest from both academia and industry since 2004. The number of published papers has increased rapidly each year, and there have been many dedicated conferences, symposia and workshops on HEAs. Traditional physical metallurgy principles as well as novel processing methods have all been applied to HEAs, and new materials with extraordinary properties have been reported. New results also show that traditional materials science concepts are inadequate to explain some of the newly observed behaviors, fueling intense development of new models for complex, concentrated alloys. The high-entropy concept has now been extended to ceramics, semiconductors, polymers, and a broad range of functional materials. As a result, the whole field has advanced dynamically and rapidly in almost every aspect of materials science and engineering.

The objective of the October 2018 Journal of Materials Research (JMR) Focus Issue on High-Entropy Alloys was to give a timely review of the present fundamental understanding of HEAs and their potential applications. This webinar expanded on the Focus Issue with talks and live Q&A with issue authors.

Host: Michael Gao, National Energy Technology Laboratory/AECOM 

High entropy alloys (HEAs) and the more broadly defined multi-principal-elements alloys (MPEAs) represent a major paradigm shift in alloy design. HEAs focus on the compositions near the center of a multicomponent phase diagram. By contrast, traditional alloys focus compositions on the boundaries (vertices, edges, or faces) of a phase diagram and typically consist of one principal element. Therefore, HEAs represent a tremendously vast compositional space that is largely unexplored by science. As an emerging field, research on HEAs has attracted rising worldwide attention and interest from both academia and industry since 2004. The number of published papers has increased rapidly each year, and there have been many dedicated conferences, symposia and workshops on HEAs. Traditional physical metallurgy principles as well as novel processing methods have all been applied to HEAs, and new materials with extraordinary properties have been reported. New results also show that traditional materials science concepts are inadequate to explain some of the newly observed behaviors, fueling intense development of new models for complex, concentrated alloys. The high-entropy concept has now been extended to ceramics, semiconductors, polymers, and a broad range of functional materials. As a result, the whole field has advanced dynamically and rapidly in almost every aspect of materials science and engineering.

The objective of the October 2018 Journal of Materials Research (JMR) Focus Issue on High-Entropy Alloys is to give a timely review of the present fundamental understanding of HEAs and their potential applications. This webinar will expand on the Focus Issue with talks and live Q&A with issue authors.

Topics:

  • Development and Exploration of Refractory High Entropy Alloys
    Daniel Miracle, Air Force Research Laboratory, USA

  • Strengthening mechanisms in high entropy alloys
    • Strengthening mechanisms in high entropy alloys: perspectives for alloy design
      Pedro Rivera-Diaz-Del-Castillo, Lancaster University
    • L12-strengthened high-entropy alloys for advanced structural applications
      Speaker TBA

  • Modeling the structure and thermodynamics of high entropy alloys
    • Modeling the structure and thermodynamics of high entropy alloys
      Michael Widom, Carnegie Mellon University
    • Current and emerging practices of CALPHAD toward the development of high entropy alloys and complex concentrated alloys
      St├ęphane Gorsse, Institute for Solid State Chemistry Bordeaux (ICMBC)

  • Electronic transport and phonon properties of maximally disordered alloys: from binaries to high entropy alloys
    George M. Stocks, Oak Ridge National Laboratory