Mechanical properties and microstructural stability of CuTa/Cu composite coatings
Mechanical properties and microstructural stability of CuTa/Cu composite coatings
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DOI：
10.1016/j.surfcoat.2019.02.072
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发表时间：
2019-04-25
影响因子：
5.4
通讯作者：
Rodil, Sandra E.
中科院分区：
文献类型：
--
作者：
Bahrami, Amin;Carrasco, Cesar F. Onofre;Rodil, Sandra E.
本文研究了镀态和823.15 K退火态CuTa涂层的组织和力学性能，目的是评价涂层的微观结构和机械热稳定性随Ta含量的变化。采用磁控共溅射方法制备了Ta含量为0~100%的CuTA涂层。用掠角X射线衍射仪、扫描和透射电子显微镜、纳米压痕等手段对其结构和力学性能进行了表征。X射线衍射结果表明，当Ta含量为15~67at.%时，涂层中形成了富Ta的CuTa玻璃金属和纳米晶铜，在823.15 K真空退火后仍保持这种结构。涂层中的铜纳米晶在非晶态基体中呈三维分布，这可能会降低玻璃基质的脆性。当Ta含量为98at.%时，硬度从纯铜的0.9 Gpa显著提高到11.9 Gpa。结果表明，复合涂层经真空退火后，组织结构保持不变，力学性能稳定。
In this study, the structure and mechanical properties of as-deposited and 823.15 K annealed CuTa coatings were studied with the purpose to evaluate the microstructural and mechanical thermal stability as a function of the Ta content. CuTa coatings with a Ta content from 0 to 100% were prepared by magnetron co-sputtering. Their structure and mechanical properties were characterized by grazing angle X-ray diffraction (XRD), scanning and transmission electron microscopy (TEM), and nanoindentation. The XRD results show that a Ta-rich CuTa glass metal is formed in the coatings with 15-67 at.% Ta along with nanocrystalline Cu and such microstructure was retained after vacuum annealing at 823.15 K. TEM analyses of selected samples showed the formation of crystalline Cu islands in an amorphous CuTa matrix in both as-deposited and annealed coatings. The coatings presented a 3D distribution of Cu nanocrystals within an amorphous CuTa matrix which might reduce the brittleness of the glassy CuTa matrix. A significant increase in hardness values from 0.9 GPa for pure Cu to 11.9 GPa for the sample with 98 at.% Ta is observed. It has been shown that the composite coatings preserved the microstructure and were mechanically stable after vacuum annealing.