Microstructures, mechanical behavior and strengthening mechanism of TiSiCN nanocomposite films.
Microstructures, mechanical behavior and strengthening mechanism of TiSiCN nanocomposite films.
复制标题
TiSiCN纳米复合薄膜的微观结构、力学行为及强化机制
DOI：
10.1038/s41598-017-02186-1
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发表时间：
2017-05-18
影响因子：
4.6
通讯作者：
Liaw PK
中科院分区：
文献类型：
--
作者：
Li W;Liu P;Xue Z;Ma F;Zhang K;Chen X;Feng R;Liaw PK
Currently, the arguments have existed in the strengthening mechanism and microstructural model of the nanocomposite film due to lack of the convincible experimental evidences. In this investigation, the quarternary TiSiCN nanocomposite films with the different C and Si contents are synthesized by the reactive-magnetron-sputtering technique. The TiSiCN film is characterized as the nanocomposite structure with the TiN nanocrystallites surrounded by the (Si3N4+ C + CNx) interface phase. When the C/Si content ratio is 2:2, the TiSiCN nanocomposite film is remarkably strengthened with the maximal hardness and elastic modulus of 46.1 GPa and 425 GPa, respectively. Meanwhile, the (Si3N4+ C + CNx) interfaces exhibit as a crystallized form, which can coordinate the growth misorientations and maintain the coherently epitaxial growth between the TiN nanocrystallites and interfaces. Through the high-resolution transmission electron microscopy (HRTEM) observations, this investigation firstly provides the direct experimental evidence for the crystallized feature of the interfaces when the TiSiCN nanocomposite film is strengthened, suggesting that the strengthening effect of the TiSiCN nanocomposite film can be attributed to the coherent-interface strengthening mechanism, which is expressed as the “nc-TiN/c-Si3N4/c-C/c-CNx” model.
