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Removal of carbon contamination prior to SEM & EDS measurement

Nano-devitrification and structural evolution of amorphous state in surface Ti-Ta-based alloy fabricated on TiNi substrate through additive thin-film electron-beam synthesis

Henniker’s HPT-100 was used in this work to remove carbon contamination on the sample’s surface before it was characterised by SEM and EDS measurements.

Recently published research from scientists at the Institute of Strength Physics and Materials Science of Siberian Branch Russian Academy of Sciences advances the understanding of Thin Film Metal Glasses (TFMGs) functional properties. TFMGs have the potential to be of great use in the microelectromechanical systems (MEMS) industry due to their small size and other useful properties. In the paper, the thermal stability and crystallisation behaviours of TFMGs with Ti-Ta film and TiNi substrate was examined. Henniker’s HPT-100 was used in this work to remove carbon contamination on the sample’s surface before it was characterised by SEM and EDS measurements.

henniker plasma sample carbon removal plasma treatment knowledge article

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Read the full abstract below

Nano-devitrification and structural evolution of amorphous state in surface Ti-Ta-based alloy fabricated on TiNi substrate through additive thin-film electron-beam synthesis

V.O.Semina E.Yu.Gudimovaab A.A.Neimana F.A.D'yachenkoa R.R.Mukhamedovaab S.Yu.Timoshevskayaab E.V.Nefedtsevc L.L.Meisnerab

a Institute of Strength Physics and Materials Science of Siberian Branch Russian Academy of Sciences, Tomsk, Russia b National Research Tomsk State University, Tomsk, Russia c Institute of High Current Electronics of Siberian Branch Russian Academy of Sciences, Tomsk, Russia

Received 15 May 2020, Accepted 29 June 2020, Available online 2 July 2020 | All images and information courtesy of www.sciencedirect.com | https://doi.org/10.1016/j.mtla.2020.100814

Abstract

henniker plasma sample carbon removal plasma treatment knowledge article

All images and information courtesy of www.sciencedirect.com

Thin film metallic glasses (TFMGs) have a high application potential in MEMS industry. An important issue in ensuring the reliability of the functional properties of TFMGs (fatigue endurance, hysteresis-free response) is their thermal stability during operation. The problem of handling of the crystallization processes in the amorphous alloys is crucial for the understanding of structure-property relationships in the TFMGs. In this work, by liquid-phase mixing of the system [Ti-Ta film/TiNi substrate] using a low-energy high-current electron beam the surface Ti-Ni-Ta alloy (denoted as [Ti-Ni-Ta]SA) was fabricated. The thermal stability and crystallization behavior in the [Ti-Ni-Ta]SA upon devitrification were studied. According to the results of microstructural XRD/SEM/TEM analysis, in the as-received [Ti-Ni-Ta]SA a thin ~ 400 nm amorphous sublayer beneath the crystalline surface layer was observed. Devitrification of the [Ti-Ni-Ta]SA on heating at T = 773 K led to the formation of a nanocomposite structure, in which the phase composition was represented by a mixture of α"(Ti,Ta) martensitic phase, β(Ti,Ta) phase, precipitates of the η'-(Ti,Ta)2Ni intermetallic phase and a small amount of residual amorphous phase. The mechanisms of crystal nucleation and growth in an amorphous matrix were determined, and a scheme of phase transformations from an amorphous to a crystalline state was proposed. The crystallization of the amorphous phase occurred in two stages, including (i) the precipitation of primary β+α" grains and (ii) the growth of the β grains and the precipitation of η'-(Ti,Ta)2Ni intermetallic phases in the inter-dendritic areas, as well as in the interfaces by the eutectic crystallization mechanism.

Keywords: - TiNi, surface allo, Nanocomposite structure, Devitrification, Metallic glass, TEM analysis

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