|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||Exploration of the Solid–Solution Space in the Co–Cr–Fe–Ni System via Rapid Alloy Selection and Synthesis Methods
||Karl Shamlaye, Manisha Senadeera, Santu Rana, Sunil Gupta, Svetha Venkatesh, Daniel Fabijanic, Matthew Barnett
|On-Site Speaker (Planned)
The FCC-structured equimolar CoCrFeNi alloy has been extensively studied, yet only a small single-phase solid solution region about this composition has been found thus far. A greater solid solution range can vastly enhance alloy design, tailoring complex alloy properties by changes in the base elements.
We employ machine learning algorithms to efficiently search a CALPHAD high entropy alloy thermodynamic database, screening for FCC compositions, to identify the extent of the single-phase solid solution region.
Rapid synthesis of selected alloys is then done via additive manufacturing, and resulting specimens can be batch-analysed by x-ray diffraction and scanning electron microscopy.
Using this high-throughput method, we show that a very wide FCC-phase region actually exists in the Co–Cr–Fe–Ni system. Thus, confidence can be built up to use similar rapid alloy selection and development methods to obtain single-phase compositions in more complex alloy systems.