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Nanoscale morphology of Ni50Ti45Cu5 nanoglass

Śniadecki, Z. and Wang, D. and Ivanisenko, Yu. and Chakravadhanula, V.S.K. and Kübel, C. and Hahn, H. and Gleiter, H. (2016):
Nanoscale morphology of Ni50Ti45Cu5 nanoglass.
In: Materials Characterization, ELSEVIER SCIENCE INC, USA, pp. 26-33, 113, ISSN 10445803,
[Online-Edition: https://doi.org/10.1016/j.matchar.2015.12.025],
[Article]

Abstract

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. Ni50Ti45Cu5 amorphous 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. (C) 2015 Elsevier Inc. All rights reserved.

Item Type: Article
Erschienen: 2016
Creators: Śniadecki, Z. and Wang, D. and Ivanisenko, Yu. and Chakravadhanula, V.S.K. and Kübel, C. and Hahn, H. and Gleiter, H.
Title: Nanoscale morphology of Ni50Ti45Cu5 nanoglass
Language: English
Abstract:

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. Ni50Ti45Cu5 amorphous 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. (C) 2015 Elsevier Inc. All rights reserved.

Journal or Publication Title: Materials Characterization
Volume: 113
Publisher: ELSEVIER SCIENCE INC, USA
Uncontrolled Keywords: Nanoglass, Magnetron sputtering, Morphology, Nanocolumn, Chemical Segregation, Transmission electron microscopy
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 26 Jul 2017 07:55
Official URL: https://doi.org/10.1016/j.matchar.2015.12.025
Identification Number: doi:10.1016/j.matchar.2015.12.025
Funders: The financial support by Deutsche Forschungsgemeinschaft within the project HA1344/30-1 is gratefully acknowledged.
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