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Experimental evidence of zonal dislocations in the Ti2AlC MAX phase.

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Title: Experimental evidence of zonal dislocations in the Ti2AlC MAX phase.
Authors: Mussi, Alexandre1 (AUTHOR) alexandre.mussi@univ-lille.fr, Henzelmeier, Adrien2 (AUTHOR), Weidner, Timmo1 (AUTHOR), Novelli, Marc2,3 (AUTHOR), Wenbo, Yu4 (AUTHOR), Cuvilly, Fabien5 (AUTHOR), Grosdidier, Thierry2,3 (AUTHOR), Guitton, Antoine1,2,3 (AUTHOR) antoine.guitton@univ-lorraine.fr
Source: Materials Characterization. Jun2023, Vol. 200, pN.PAG-N.PAG. 1p.
Subjects: Deformation of surfaces, Transmission electron microscopy, Material plasticity, Ternary alloys, Deformations (Mechanics)
Abstract: The dislocation configurations of a Ti 2 AlC-MAX phase deformed under severe plastic deformation by surface mechanical attrition treatment have been analyzed by transmission electron microscopy. Results show that the microstructure of the deformed Ti 2 AlC sample is composed of numerous 〈 a 〉-dislocations, which interact with each other notably with dipolar configurations. In addition, we report here 〈 a 〉-dislocation dissociations in the basal plane with a dissociation distance of approximately 20 nm, following the reaction 1 3 2 1 ¯ 1 ¯ 0 ⇔ 1 3 1 1 ¯ 00 + 1 3 10 1 ¯ 0. Finally, evidence of zonal dislocations is reported. These original results are discussed in the context of the fundamental deformation mechanisms of nanolayered ternary alloys. [Display omitted] • TEM analyses of a severe plastically deformed Ti 2 AlC MAX phase are reported. • Dipoles and dissociations of dislocations are characterized. • Zonal dislocations are characterized for the first time in MAX phases. • Such zonal dislocations were predicted by simulation in MAX phases. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:The dislocation configurations of a Ti 2 AlC-MAX phase deformed under severe plastic deformation by surface mechanical attrition treatment have been analyzed by transmission electron microscopy. Results show that the microstructure of the deformed Ti 2 AlC sample is composed of numerous 〈 a 〉-dislocations, which interact with each other notably with dipolar configurations. In addition, we report here 〈 a 〉-dislocation dissociations in the basal plane with a dissociation distance of approximately 20 nm, following the reaction 1 3 2 1 ¯ 1 ¯ 0 ⇔ 1 3 1 1 ¯ 00 + 1 3 10 1 ¯ 0. Finally, evidence of zonal dislocations is reported. These original results are discussed in the context of the fundamental deformation mechanisms of nanolayered ternary alloys. [Display omitted] • TEM analyses of a severe plastically deformed Ti 2 AlC MAX phase are reported. • Dipoles and dissociations of dislocations are characterized. • Zonal dislocations are characterized for the first time in MAX phases. • Such zonal dislocations were predicted by simulation in MAX phases. [ABSTRACT FROM AUTHOR]
ISSN:10445803
DOI:10.1016/j.matchar.2023.112882