Frank partial dislocation in Ti2AlC-MAX phase induced by matrix-Cu diffusion

SCRIPTA MATERIALIA

卷:191

Article

Yu, Wenbo¹  Guenole, Julien^2,3  Ghanbaja, Jaafar⁴  Vallet, Maxime⁵  Guitton, Antoine^2,3 

[1] Beijing Jiaotong Univ, Ctr Mat Sci & Engn, Sch Mech & Elect Control Engn, Beijing, Peoples R China

[2] Univ Lorraine, LEM3, Arts & Metiers ParisTech, CNRS, 7 Rue Felix Savart, F-57070 Metz, France

[3] Univ Lorraine, Lab Excellence Design Alloy Met Low mAss Struct D, Metz, France

[4] Univ Lorraine, IJL, CNRS, Nancy, France

[5] Univ Paris Saclay, Serv Rech Met Phys, CEA, DEN, Gif Sur Yvette, France

关键词: Ti2AlC;    Cu;    Composite;    Diffusion;    High-resolution TEM;    EELS;    Atomistic simulations;    MAX phase;   

DOI  :  10.1016/j.scriptamat.2020.09.007

来源: Elsevier

【 摘 要 】

The control of complex nanostructures is one of the most promising strategy for designing tailored property materials. Ti2AlC, as nanolayered ternary materials combining both ceramics and metals properties, could efficiently reinforce metal matrix composite by its decomposition into nano-Ti2C particles. However, the comprehensive description of the diffusion mechanisms of Cu element into Ti2AlC during its decomposition has not yet been revealed. Herein, we report detailed characterizations of Cu and Ti2AlC interlayers by means of high-resolution electron microscopy and atomic-scale simulations. In particular, we report the formation of Ti2AlxCuyC solid solutions. Furthermore, we demonstrate the formation of Ti2C platelets and evidenced Frank partial dislocations that are not expected to be found in such material. Impacts of such defects are discussed in the framework of mechanical behavior. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free