| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
High Entropy Materials: Concentrated Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond V
|
| Presentation Title |
Processing of Cantor Derived (Co-Fe-Ni-Mn) Multi-Principal Element Alloys by Solid State
Reduction of Oxides |
| Author(s) |
Wookyung Jin, Prince Sharma, Helen M Chan, Animesh Kundu, Ganesh Balasubramanian |
| On-Site Speaker (Planned) |
Wookyung Jin |
| Abstract Scope |
Research at Lehigh has demonstrated that multi-principal element alloys (MPEAs) based on Co- Fe-Ni-Mn can be obtained from the solid state reduction of the constituent oxides under dilute hydrogen atmospheres (3 % H2 – Ar) at 1100 °C. It follows that MnO, which is known to be highly stable, can be reduced under these conditions. In addition to entropy contribution (ΔS), it is proposed that reduction is enhanced due to the negative enthalpy of solid solution (ΔH) of Mn metal in the MPEA composition. To further understand the process, oxide mixtures based on binary equimolar (CoMn, FeMn and NiMn) and quaternary CoFeMnNi compositions were subjected to extended reduction times at 1100 °C, and resultant microstructures and composition characterized. Complete reduction of bulk samples was achieved in several cases. These results will be discussed with predictions based on values of ΔH and ΔS calculated from the first principles and experimental data. |