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Complex intermetallic materials known as MAX phases exhibit exceptionalproperties from both metals and ceramics, largely thanks to their nanolayeredstructure. With high-resolution scanning transmission electron microscopysupported by atomistic modelling, we reveal atomic features of a nano-twistphase in the nanolayered \MAX. The rotated hexagonal single-crystal isencompassed within basal symmetric twist interfaces similar to grainboundaries. In particular, we show that air-oxidation at \SI{1000}{\celsius}can form a twisted phase that leads to the formation of interfacial dislocationnetworks with screw characters or to severe interfacial reconstructions.Additionally, we explore the contribution of disclinations to therepresentation by continuum models of the stress field generated by suchnano-twist defect in the \MAX{} bulk phase. The occurrence of this unexpecteddefect is expected to impact the physical response of this nanolayered-basedmaterial as such supports property-by-design approaches.

Features of a nano-twist phase in the nanolayered Ti3AlC2 MAX phase