Combinatorial Exploration and Mapping of Phase Transformation in a Ni–Ti–Co Thin Film Library
| Autor: | Edward Walton, Apurva Mehta, Peer Decker, Jonathan D. P. Counsell, Alfred Ludwig, Huilong Hou, Sigurd Thienhaus, Ichiro Takeuchi, Naila Al Hasan, Suchismita Sarker, Tieren Gao |
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| Rok vydání: | 2020 |
| Předmět: |
Titanium
Diffraction Chemistry Molecular Conformation Analytical chemistry Cobalt General Chemistry General Medicine Microstructure Phase Transition Machine Learning Small Molecule Libraries Structure-Activity Relationship Wavelength-dispersive X-ray spectroscopy X-ray photoelectron spectroscopy Nickel Phase (matter) Diffusionless transformation Materials Testing Cavity magnetron Alloys Combinatorial Chemistry Techniques Transition Temperature Thin film Crystallization |
| Zdroj: | ACS Combinatorial Science. 22:641-648 |
| ISSN: | 2156-8944 2156-8952 |
| Popis: | Combinatorial synthesis and high-throughput characterization of a Ni-Ti-Co thin film materials library are reported for exploration of reversible martensitic transformation. The library was prepared by magnetron co-sputtering, annealed in vacuum at 500 °C without atmospheric exposure, and evaluated for shape memory behavior as an indicator of transformation. Composition, structure, and transformation behavior of the 177 pads in the library were characterized using high-throughput wavelength dispersive spectroscopy (WDS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and four-point probe temperature-dependent resistance (R(T)) measurements. A new, expanded composition space having phase transformation with low thermal hysteresis and Co > 10 at. % is found. Unsupervised machine learning methods of hierarchical clustering were employed to streamline data processing of the large XRD and XPS data sets. Through cluster analysis of XRD data, we identified and mapped the constituent structural phases. Composition-structure-property maps for the ternary system are made to correlate the functional properties to the local microstructure and composition of the Ni-Ti-Co thin film library. |
| Databáze: | OpenAIRE |
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