Nanoscale morphology of Ni50Ti45Cu5 nanoglass
Nanoscale morphology of Ni50Ti45Cu5 nanoglass
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DOI：
10.1016/j.matchar.2015.12.025
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发表时间：
2016-03
影响因子：
4.7
通讯作者：
Z. Śniadecki;Di Wang;Y. Ivanisenko;V. Chakravadhanula;C. Kübel;H. Hahn;H. Gleiter
中科院分区：
文献类型：
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作者：
Z. Śniadecki;Di Wang;Y. Ivanisenko;V. Chakravadhanula;C. Kübel;H. Hahn;H. Gleiter
Nanoglasses are noncrystalline solids with a granular nano-/microstructure. In contrast to their nanocrystalline analogs, typically constituted of grains and grain boundaries, nanoglasses consist of glassy regions with a structure corresponding to melt-quenched glasses and amorphous interfaces characterized by a reduced density. Their unique properties can be controlled by modifying size and chemical composition of the granular and interfacial regions. Ni50Ti45Cu5amorphous films were obtained by magnetron sputtering and analyzed to determine their nanoscale morphology and the formation mechanisms. The nanoglasses were noted to have a hierarchical nano-columnar structure with the smallest Ni-rich (Ni:Ti ratio of ca. 5:3) amorphous columns with diameters of about 8 nm and Ti-rich glassy interfacial regions with a substantially lower density. The results were obtained utilizing X-ray diffraction and different microscopic methods, e.g., atomic force microscopy and transmission electron microscopy. A detailed analysis indicates the complexity of the formation mechanisms of topologically and chemically distinguishable structural units with curvature driven surface diffusion, surface mobility, self-shadowing and internal stresses as the most important parameters. Common and simple synthesis method and the possibility for easy modification of the morphology and, consequently, the physical properties offer an opportunity for intensive studies of this new class of materials, opening the way towards possible applications.
