- Title
- Theoretical and experimental investigation of the W-Al-B and Mo-Al-B systems to approach bulk WAlB synthesis
- Creator
- Richardson, Peter J.; Keast, Vicki J.; Cuskelly, Dylan T.; Kisi, Erich H.
- Relation
- Journal of the European Ceramic Society Vol. 41, Issue 3, p. 1859-1868
- Publisher Link
- http://dx.doi.org/10.1016/j.jeurceramsoc.2020.10.066
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2021
- Description
- MAB phases are a family of ternary transition metal borides with a layered crystal structure, that provides them with properties likely to be suitable for applications within extreme environments. Here, we report a computational and experimental examination of the W-Al-B system compared to the isostructural Mo-Al-B system. Utilising DFT calculations, WAlB and MoAlB were found to be thermodynamically favourable compared to their most stable competing phases, with respective total energy differences of -0.15 eV and -0.28 eV at 0 K. Partial substitution of W on the Mo-site of MoAlB was observed for certain solid solution compositions. The experimental results indicate that synthesis of (Mo,W)AlB compounds is driven by in-situ formation of metal boride solid solutions, (Mo,W)B, which further react with Al, Mo-Al, W-Al or (Mo,W)-Al compounds to obtain the MAB phase structure. Finally, reactive hot-pressing was shown to be a promising avenue for the production of dense engineering (Mo,W)AlB-containing components.
- Subject
- MoAlB; WAlB; mab phase; solid solution; thermodynamic stability
- Identifier
- http://hdl.handle.net/1959.13/1449179
- Identifier
- uon:43594
- Identifier
- ISSN:0955-2219
- Language
- eng
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