Effect of the annealing atmosphere on the layer interdiffusion in Pd/Ti/Pd multilayer stacks deposited on pure Ti and Ti-alloy substrates
| Autor: | Avesh Sook, Franscious Cummings, Christopher J. Arendse, Steven Magogodi, S. Halindintwali, Nametso Mongwaketsi, Karen J. Cloete, Zakhelumuzi Khumalo, C. Mtshali, Earl Mc Donald, Moshawe J. Madito, Caswell Pieters |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Nuclear and High Energy Physics
Materials science Hydrogen Scanning electron microscope Annealing (metallurgy) Alloy Analytical chemistry Titanium alloy chemistry.chemical_element 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Rutherford backscattering spectrometry 01 natural sciences Electron beam physical vapor deposition 0104 chemical sciences chemistry X-ray crystallography engineering 0210 nano-technology Instrumentation |
| Zdroj: | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 461:37-43 |
| ISSN: | 0168-583X |
| DOI: | 10.1016/j.nimb.2019.09.018 |
| Popis: | Pd(50 nm)/Ti(25 nm)/Pd(50 nm) multilayer stack has been deposited on Ti and Ti6Al4V substrates; we have studied the intermixing of layers upon annealing at the hydrogenation temperature of 550 °C, under vacuum, H/Ar gas mixture and pure hydrogen atmospheres. Scanning electron microscopy (SEM) micrographs indicated surface roughening in samples annealed under vacuum and H/Ar gas mixture while those annealed under pure H2 remained relatively smoother. Rutherford backscattering spectrometry (RBS) revealed intermixing of layers as evidenced by the diffusion of Pd toward the bulk, while XRD indicated the formation of PdTi2 phase in the samples annealed under vacuum and H/Ar gas mixture atmosphere. In-situ, real-time RBS showed that the annealing under pure H2 preserves the integrity of the Pd catalyst. No indication of the PdTi2 formation in the pure H2 annealed samples was observed; instead only the TiH2 phase appeared, indicating the absorption of H into the system. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect