|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||High-throughput Aging Investigation of High-entropy Alloys for Advanced Nuclear Applications
||Michael J. Moorehead, Mohamed Elbakhshwan, Calvin Parkin, Kumar Sridharan, Chuan Zhang, Alan Savan, Alfred Ludwig, Dan Thoma, Adrien Couet
|On-Site Speaker (Planned)
||Michael J. Moorehead
While high-entropy alloys (HEAs) have gained interest for advanced nuclear applications, many single-phase HEAs undergo phase separation or form precipitates at intermediate temperatures which can lead to undesirable property changes. Long-term aging experiments for select compositions in the Cr-Fe-Mn-Ni and Nb-Ta-Ti-V systems at 700 °C have confirmed this. However, performing such experiments for entire HEA composition spaces, conventionally, is intractable. To overcome this, high-throughput synthesis techniques of these two HEA systems, including in situ alloying via additive manufacturing and combinatorial thin-film co-deposition have been employed. Using these techniques, compositional arrays have been produced on build plates and wafers which have been subjected to thermal aging at temperatures relevant to advanced nuclear reactors. X-ray diffraction has been used to examine the compositional arrays for second phases while X-ray spectroscopy and electron microscopy have been used to estimate compositions and phase fractions. These results are used to inform CALPHAD modeling for HEAs.