Microstructural characterization and strengthening mechanism of AlN/Y nanocomposite and nanomultilayered films

JOURNAL OF ALLOYS AND COMPOUNDS

卷:732

Article

Li, Wei¹  Zhang, Ke¹  Liu, Ping¹  Zheng, Wei¹  Ma, Fengcang¹  Chen, Xiaohong¹  Feng, Rui²  Liaw, Peter K.² 

[1] Univ Shanghai Sci & Technol, Sch Mat Sci & Engn, Shanghai 200093, Peoples R China

[2] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

关键词: Coating materials;    Nanostructured materials;    Vapor deposition;    Microstructure;    Surfaces and interfaces;    Mechanical properties;   

DOI  :  10.1016/j.jallcom.2017.10.244

来源: Elsevier

【 摘 要 】

The AlN/Y nanocomposite and nanomultilayered films with different Y contents were fabricated by the magnetron sputtering technique. The microstructures and mechanical properties of the AlN/Y nanocomposite and nanomultilayered films were characterized and measured, respectively. The AlN/ Y nanocomposite film is composed of equiaxed AlN nanocrystallites encapsulated by the Y interfaces. When the Y:Al ratio is 2:23, Y interfaces can exist as the crystallized state and keep the epitaxial growth with the adjacent AlN nanocrystallites. Accordingly, the crystallization degree and mechanical properties are improved. The AlN/ Y nanomultilayered film consists of the evident multilayered structure with distinct interfaces. When the Y-layer thickness is no more than 0.7 nm, Y layers are inclined to grow epitaxially with the adjacent AlN layers, leading to the improvement of crystallization degrees and mechanical properties. The interfacial evolutions and mechanical properties variations between AlN/ Y nanocomposite and nanomultilayered films have the common feature as the Y content grows. It has been experimentally and theoretically verified that the AlN/ Y nanocomposite and nanomultilayered films have the same coherent-interface strengthening mechanism. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

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