Spark Plasma Sintering of High Entropy Alloys
High Entropy Alloys (HEAs) are a fairly new class of alloys and, although there is still discussion concerning a definitive classification of what an HEA is, they are typically characterised as having five or more principal alloying elements each at a concentration of 5% or higher. HEAs are currently the focus of much research as they have the potential to deliver improved properties over more conventional alloys. Such properties usually include improved mechanical performance and enhanced high-temperature properties. However, achievement of better properties is very dependent on the processing routes used to produce HEA material. This contribution focusses on processing routes that exploit high –pressure, especially the Spark Plasma Sintering (SPS) method, and also a promising new subset of HEA materials, namely HEA composite alloys (HEACs). While this field is still at an early stage of development some trends are beginning to emerge.
KeywordsHigh-Entropy Alloys Spark Plasma Sintering High Entropy Alloy Composites
This work was partially supported by the Welsh Government and Higher Education Funding Council for Wales through the Sêr Cymru National Research Network in Advanced Engineering and Materials and by the Materials Advanced Characterization Centre (MACH1) at Swansea University. The authors also gratefully acknowledge the helpful comments and suggestions of the reviewers, which have improved the presentation.
- Yusenko KV, Riva S, Crichton WA, Spektor K, Bykova E, Pakhomova A, Tudball A, Kupenko I, Rohrbach A, Klemme S, Mazzali F, Margadonna S, Lavery NP, Brown SGR (2018) High-pressure high-temperature tailoring of High Entropy Alloys for extreme environments. J Alloys Compd 738:491–500CrossRefGoogle Scholar
- Zhang KB, Fu ZY, Zhang JY, Wang WM, Lee SW, Niihara K (2010) Characterization of nanocrystalline CoCrFeNiTiAl high-entropy solid solution processed by mechanical alloying. J Alloys Compd 495(1):3–38Google Scholar