MAB phase-alumina composite formation via aluminothermic exchange reactions

•MAB phase-alumina composites synthesised via aluminothermic exchange reactions.•Successful synthesis in the Fe, Cr, Mn, Mo systems using respective metal oxides.•The effect of 20% excess Al and alternate starting Fe-oxide were also investigated.•20% excess Al increased conversion in all systems exc...

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Bibliographic Details
Published in:Materials letters 2024-04, Vol.360, p.135869, Article 135869
Main Authors: Merz, Jessica, Cuskelly, Dylan, Richardson, Peter
Format: Article
Language:English
Subjects:
Aluminothermic reduction
Exchange reactions
MAB phase
MAB phase-alumina composites
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Summary:•MAB phase-alumina composites synthesised via aluminothermic exchange reactions.•Successful synthesis in the Fe, Cr, Mn, Mo systems using respective metal oxides.•The effect of 20% excess Al and alternate starting Fe-oxide were also investigated.•20% excess Al increased conversion in all systems except Fe. The formation of MAB phase-alumina composites through aluminothermic exchange reactions using M-element (Fe, Mn, Cr, Mo, W) oxides has been investigated for the MAB phases Fe2AlB2, Mn2AlB2, Cr2AlB2, MoAlB, and WAlB for the first time. With the exception of WAlB, all systems formed MAB phase and alumina as major phases, with binary M-element borides, aluminides and/or oxides as minor phases. An alternative Al ratio (120%) was investigated, which increased conversion to all MAB phases except Fe2AlB2. Exchange reactions using oxides present a potential alternative to synthesis methods using often more expensive pure elements.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2024.135869