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Improving embrittlement in the Ti-Al-C MAX phase system: A composite approach for surface severe plastic deformation by Adrien Heinzelmeier; Antoine Guitton; Marc Novelli; Wenbo Yu; Thierry Grosdidier is a Materials Science article available to read on EtoBox.

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Ti 2 AlC and Ti 3 AlC 2 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/TiAl 2 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 TiAl 2 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 TiAl 2 phases.

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Author

Adrien Heinzelmeier; Antoine Guitton; Marc Novelli; Wenbo Yu; Thierry Grosdidier

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Materials Science (Physical Sciences)