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Article Dans Une Revue Journal of Alloys and Compounds Année : 2023

Improving embrittlement in the Ti-Al-C MAX phase system: a composite approach for surface severe plastic deformation

Résumé

Ti2AlC and Ti3AlC2 belong to an interesting family of layered compounds called MAX phases. A composite approach is tested here to improve the intrinsic brittle behaviour of such compounds. To this end, a bulk MAX compound and a MAX/TiAl2 composite have been deformed under surface severe plastic deformation (SSPD) by surface mechanical attrition treatment (SMAT). Grain delamination and grain decohesion occurred to a depth of 100 µm below the surface for the bulk compound. Resulting cracks and grain pullouts were witnessed by a decrease in the surface and sub-surface hardness. Comparatively, the presence of intergranular TiAl2 effectively prevented such failure for the composite. Thus, the SSPD of this cohesive composite created a surface hardening (+60%) gradient extending down to a depth of 250 µm. Witness marks of plasticity were revealed in both the MAX and TiAl2 phases.
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Dates et versions

hal-03714488 , version 1 (16-06-2023)

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Adrien Heinzelmeier, Antoine Guitton, Marc Novelli, Wenbo Yu, Thierry Grosdidier. Improving embrittlement in the Ti-Al-C MAX phase system: a composite approach for surface severe plastic deformation. Journal of Alloys and Compounds, 2023, pp.169946. ⟨10.1016/j.jallcom.2023.169946⟩. ⟨hal-03714488⟩
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