About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
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| Symposium
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Honorary Symposium in Celebration of Prof. Michel Barsoum’s 70th Birthday
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| Presentation Title |
Stability and Properties of MAX Phases with Compositionally Complex M-layers |
| Author(s) |
Milos Dujovic, Zeyi Tan, Ankit Srivastava, Miladin Radovic |
| On-Site Speaker (Planned) |
Milos Dujovic |
| Abstract Scope |
This work focuses on MAX phase ternary carbides with chemical formula M2AlC where M is either Cr, Ti, Ta, V, Nb or a combination of them. Specifically, we focus on synthesizing M2AlC phases with two-five elements on M-site in equiatomic ratios starting from single M-element M2AlC. This approach for synthesizing MAX phases with compositionally complex M-layers is selected to avoid the formation of intermediate phases in the final microstructure due to possible incomplete reaction of elemental powders. While equiatomic M-element ratios are considered to (theoretically) maximize configurational entropy and, hence their stability. Our results show that out of 26 compositionally complex M2AlC examined in this study, only a few are found to be phase pure, while only one of them with four elements in the M-layers is entropy stabilized. Furthermore, the mechanical testing of these compositionally complex M2AlC suggests that the solid solution strengthening effect is not always dominant. |