AlN/Y纳米复合材料和纳米多层膜的显微结构表征及强化机制,Journal of Alloys and Compounds

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AlN/Y纳米复合材料和纳米多层膜的显微结构表征及强化机制
Journal of Alloys and Compounds ( IF 5.8 ) Pub Date : 2018-01-01 , DOI: 10.1016/j.jallcom.2017.10.244
Wei Li , Ke Zhang , Ping Liu , Wei Zheng , Fengcang Ma , Xiaohong Chen , Rui Feng , Peter K. Liaw

摘要采用磁控溅射技术制备了不同Y含量的AlN/Y纳米复合材料和纳米多层薄膜。分别表征和测量了 AlN/Y 纳米复合材料和纳米多层膜的微观结构和机械性能。AlN/Y 纳米复合膜由 Y 界面封装的等轴 AlN 纳米微晶组成。当 Y:Al 比为 2:23 时，Y 界面可以以结晶状态存在，并保持与相邻的 AlN 纳米微晶的外延生长。因此，结晶度和机械性能得到改善。AlN/Y 纳米多层膜由明显的多层结构组成，具有不同的界面。当Y层厚度不超过0.7nm时，Y层倾向于与相邻的AlN层外延生长，从而提高结晶度和机械性能。随着 Y 含量的增加，AlN/Y 纳米复合材料和纳米多层膜之间的界面演变和机械性能变化具有共同特征。实验和理论验证了AlN/Y纳米复合材料和纳米多层薄膜具有相同的相干界面强化机制。

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

Abstract 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.

更新日期：2018-01-01

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