ICMCTF2016 Session HP: Symposium H Poster Session

Thursday, April 28, 2016 5:00 PM in Room Grand Hall

Thursday Afternoon

Time Period ThP Sessions | Topic H Sessions | Time Periods | Topics | ICMCTF2016 Schedule

HP-1 X-ray Synchrotron In-Situ Mechanical Study of Nanolayered Gold Thin Films under Continuous Controlled Biaxial Deformation
Philippe Goudeau, Raphaëlle Guillou, Pierre-Olivier Renault, Eric Le Bourhis, Pierre Godard (Université de Poitiers, Institut Pprime, France); Damien Faurie (LSPM-CNRS, France); Guillaume Geandier (Institut Jean Lamour-UMR 7198 CNRS-Université de Lorraine, France); Cristian Mocuta, Dominique Thiaudière (synchrotron SOLEIL, France)

Thin film technology is pervasive in microelectronics, and in optical, magnetic or micro-mechanical devices. However, the mechanical stability of such nanoscale structure is crucial for applications since it is related to device lifetime. Furthermore, the mechanical behavior of nanostructured materials is still not well known. In order to study size effect, nanostructured thin films have been elaborated by sequenced ion beam sputtering. The grain size is controlled by stopping the grain growth during the thin film growth [1]. Using a biaxial tensile setup developed on the DiffAbs beamline at synchrotron SOLEIL [2], we performed x-ray diffraction (XRD) measurements during controlled biaxial deformation tests on gold thin films deposited on Kapton substrate. Strain analysis of different types of gold thin films with different grain size and architecture has been performed during different proportional loadings using the sin²ψ method. The resulting gold Bragg peak shifts are monitored thanks to a 2D detector. XRD allows measuring the intra-granular strains using the so-called sin²ψ method while the macroscopic in-plane strains are measured simultaneously thanks to Digital Image Correlation. The average method [3] has been applied to extract the evolution of the elastic strains from the sin²ψ curves which are then plotted versus macroscopic strains in order to extract the elastic limit. By analyzing the mechanical response of the different films [4], we conclude that gold thin films follow a plastic deformation mode whatever the grain size or thin film architecture.

[1] Girault. B, Eydi. D, Goudeau. P, Sauvage. T, Guerin. P, Le Bourhis. E, Renault. P.O., Journal of Applied Physics (2013) 113, 174310

[2] Geandier. G, Thiaudière. D, Randriamazaoro .R. N., Chiron. R, Djaziri. S, Lamongie. B, Diot. Y, Le Bourhis .E, Renault .P. O., Goudeau .P, Bouaffad .A, Castelnau .O, Faurie .D, Hild .F, Review of Scientific Instruments (2010) 81, 103903

[3] Faurie. D, Renault. P.O, Le Bourhis. E, Chauveau. T, Castelnau. O, Goudeau. P, Journal of Applied Crystallography (2009) 44, 409-413

[4] Djaziri. S, Faurie. D, Renault. P.O, Le Bourhis. E, Goudeau. P, Geandier. G, Thiaudière. D, Acta Materialia (2013) 61, 5067-5077

HP-4 Electrical and Chemical Domains Maps Promoted by TiO2 Incorporated in a DLC Multilayer using Kelvin Probe Force Microscopy (KPFM) and Confocal Raman Analyses
Lucia Vieira (University of Paraiba Valley, UNIVAP/ IP&D, Brazil); Thaisa B. Santos (University of Paraíba Valley, Brazil); Carlos Costa, Evandro Lanzoni, Christoph Deneke (National Nanotechnology Laboratory, CNPEM/ LNNano, Brazil); Rodrigo Pessoa, Luciana Otavianao (University of Paraiba Valley, UNIVAP/ IP&D, Brazil); Polyana Alves Radi (Technological Institute of Aeronautics, ITA/LPP, Brazil)

In this paper we used capacitance gradient map (∂C/∂z) arising of Kelvin probe force microscopy (KPFM) and confocal-Raman spectroscopy map to identify TiO2 nanoparticles, distributed in anatase phase, between two layers of Diamond-like carbon (DLC) film. The sample was used to compare the ∂C/∂z and regular KPFM images used to identify electrical properties of TiO2 buried a few nanometers from the top. In a single-pass of KPFM scanning: topography, surface potential, and ∂C/∂z maps were acquired simultaneously. From confocal-Raman spectroscopy analyses, the signature of anatase phase where also identified. For sample preparation, a thin layer of DLC was first deposited on a silicon substrate by plasma enhanced chemical vapor deposition (PECVD). After DLC deposition, the surface was treated with nebulizer vapor in air environment containing alcohol and nanoparticles of TiO2 in anatase phase. The vapor was produced in ultra sound under laminar flow. The nanoparticles of TiO2 were then anchored in the DLC matrix by means of an additional thin DLC layer produced by PECVD deposited over the TiO2 nanoparticle. The finished sample comprised silicon substrate with DLC -TiO2-DLC. These procedures allow us to infer the uniformity of chemical domains distributed in an amorphous film enabling a correlation with the correspondent surface potential obtained by ∂C/∂z and confocal maps.

HP-5 High Throughput Combinatorial Thin-film Synthesis of Co-based Superalloys
Janak Thapa, Cameron Gross, Yip-Wah Chung, Michael Bedzyk (Northwestern University, USA)
Cobalt-based superalloys have excellent high temperature properties and are applicable for many high temperature and high stress applications, such as jet engine turbine blades and nuclear power plants. The design and development of these alloys is impeded by a lack of thermodynamic databases for ternary systems. This project strives to fill this database gap by implementing high-throughput combinatorial thin film synthesis coupled with high flux X-ray techniques to efficiently create experimentally verified phase diagrams of ternary alloy systems. We use a combination of the naturally scalable techniques of photolithography and magnetron sputtering to create a fine grid of compositions across the surface of our substrate. The composition and phases present for each individual grid point can be determined fromX-ray analysis. Additionally, we are capable of conducting in-situ high temperature XRD experiments up to 1100°C to generate isothermal slices of the phase diagram. Using this method, we can quickly construct experimentally verified, ternary phase diagrams over a range of temperatures. These phase diagrams will provide a foundation of understanding to accelerate the creation and implementation of novel Co-based superalloys.
Time Period ThP Sessions | Topic H Sessions | Time Periods | Topics | ICMCTF2016 Schedule