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説明:

MAX phases serve as an ideal model system for studying the crossover between metallic and ceramic behavior, and improved ceramic ductility. This ductility is primarily linked to the anomalously easy glide of basal plane dislocations; yet a full theoretical understanding of the characteristics governing their mobility remains a subject of continuing research. Following recent efforts using atomistic simulations of MAX phase basal plane dislocation cores, the present study focused on an experimental evaluation of friction and Peierls stresses in three representative MAX phase compounds, Ti3AlC2, Ti3SiC2, and Cr2AlC, using micropillar compression at cryogenic temperatures. The study examines specifically the effects of temperature, size, and pristine dislocation morphology under aid of crystal plasticity finite element simulations to derive the lattice resistance for each compound and compare it with previously simulated results. The results confirm a significant role of core structures and bonding characteristics on MAX phase dislocation plasticity, and further indicate a non-negligible influence of dislocation interactions or forest hardening on bulk MAX phase ductility. The cryogenic tests presented here mark the first such experiments in MAX phases and open new pathways for understanding their deformation behavior at low temperatures.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: MAX phases, Micropillar compression, Peierls stresses, Activation parameters, Cryogenic deformation

刊行年月日: 2026-06-09

出版者:

掲載誌:

• Acta Materialia (ISSN: 13596454) vol. 316 122432

研究助成金:

• EU Framework Programme for Research and Innovation Marie Skłodowska-Curie Actions 754364
• Office of Naval Research N00014-26-1-2021
• Engineering and Physical Sciences Research Council Doctoral Training Programme

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1016/j.actamat.2026.122432

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更新時刻: 2026-07-08 11:46:21 +0900

MDRでの公開時刻: 2026-07-08 14:26:11 +0900