Advanced Functional and Structural Thin Films and Coatings & Honorary Palkowski Session: Advanced Functional and Structural Thin Films and Coatings
Sponsored by: TMS Functional Materials Division, TMS: Thin Films and Interfaces Committee
Program Organizers: Gerald Ferblantier, University of Strasbourg - IUT LP / ICube Laboratory - CNRS; Adele Carrado, University of Strasbourg; Ramana Chintalapalle, University of Texas at El Paso; Karine Mougin, Cnrs, Is2m; Ravindra Nuggehalli, New Jersey Institute of Technology; Heinz Palkowski, Clausthal University of Technology
Thursday 8:30 AM
March 23, 2023
Room: Aqua F
Location: Hilton
Session Chair: Ravindra Nuggehalli, New Jersey Institute of Technology; Karine Mougin, CNRS, IS2M; Gerald Ferblantier, University of Strasbourg, ICube Laboratory, CNRS
8:30 AM Introductory Comments
8:35 AM
Recent Advances in Solid-State Neutron Detectors: Walter Rose1; Nuggehalli Ravindra1; 1New Jersey Institute of Technology
In recent years, there have been considerable advances in the fabrication of solid state neutron detectors. Historically, solid state detectors have suffered from low efficiency in comparison to scintillation and proportional counter based detectors. Exotic geometries have been proposed with the goal of increasing the efficiency of the indirect conversion scheme. In addition to non-conventional indirect detector geometries, there has been considerable work in recent years in the fabrication of direct conversion materials with intrinsically high efficiencies. This review paper will highlight some of the recent advances in both direct and indirect conversion mechanisms for neutron detection.
8:55 AM Invited
Oxidation-induced Cracking in Dissimilar Metal Weld Joins for Steam Boiler Applications: Marissa Brennan1; Voramon Dheeradhada1; Shenyan Huang1; Patrick Brennan1; Enes Sales1; Marija Drobjnak1; 1GE Research
Dissimilar metal welds such as those used in boiler or heat recovery steam generators (HRSG) have exhibited oxidation-induced cracking after long-term exposure at elevated temperatures. Oxidation-induced cracking, also termed oxide notching, occurs at or near the weld interface due to differences in oxidation behaviors at the joint which is exacerbated by local stress. Immature cracking can degrade the power plant operation requiring expensive repair. Thermally sprayed iron-based coatings acted as an oxidation resistance coating providing a barrier to slow the internal attack of oxidizing species. Coating microstructure, chemical analyses, and tensile adhesion data informed the feasibility of this as a preventative solution to oxide notching in the field. Furthermore, the evolution of phase stability over the service lifecycle was evaluated in order to identify anticipated diffusing species across the ferritic/austenitic weld boundaries.Acknowledgement: This material is based upon work supported by the Department of Energy under Award Number(s) DE-FE0031907.
9:25 AM
Study of Crystallization of Amorphous Metals through Molecular Dynamics Simulations: Prashant Dwivedi1; Alberto Fraile2; Tomáš Polcar1; 1Czech Technical University in Prague; 2Bangor University
Amorphous materials, such as amorphous alloys and metallic glasses are of current interest due to their unusual properties including high strength, good corrosion resistance, and much higher hardness than crystalline alloys of comparable elastic modulus. Amorphous materials also offer promising routes for the design of multilayered coatings with improved mechanical properties. Today the available computation power allows accurate and large size Molecular Dynamics (MD) simulations of almost any kind of system, this way guiding experiments and design of new materials.The crystallization of refractory metals (W, Nb, Ta, V, Mo) plus Fe, Cr has been examined using MD simulations. All these metals are more stable in their usual bcc structure, so under indentation, a growth of bcc crystals is observed. A simple model correlating crystal-forming ability with few thermodynamic properties will be presented. The model has been tested for fcc metals and binary alloys as well.
9:45 AM
Effect of (2-D) Machining-based Severe Plastic Deformation on Microstructure and Mechanical Properties of Titanium Alloys: Pushpinder Kumar1; Ravinder Joshi1; Rohit Singla1; 1Thapar Institute of Engineering and Technology Patiala India
Production of Titanium laminates is more difficult and expensive than other metals due to the challenges of multipass processing with intermediate annealing. The machining-based constrained laminates are formed by plane-strain (2-D) machining and its impact has been analysed. In the present research work, ultrafine titanium laminates are fabricated through a novel technique, large strain extrusion machining in a single pass. Laminates were produced from Ti–6Al–4V, Ti–6Al–7Nb, and pure titanium (CP-Ti). Hardness is tested by a Nano hardness tester. It is evident from the analysis that the hardness of laminates is increased in produced laminates as compared to the base materials. Changes in the crystallite structure of the material with severe plastic deformation may have led to an increase in the hardness of laminates. Metallurgical characterization through SEM/XRD/EBSD analysis is performed to check the effects of different parameters on laminate properties.
10:05 AM Break
10:25 AM
Efficient Silicon Room-Temperature Bandgap Emission Related To Correlated Electron-Hole Recombination: Sufian Abedrabbo1; Elmostafa Benchafia1; Ali Abdullah1; Anthony Fiory2; Nuggehalli Ravindra3; 1Khalifa University; 2Integron Solutions LLC.; 3New Jersey Institute of Technology
Ordinary Czochralski silicon (CZ-Si) is known to be inferior in radiative recombination at the bandgap. Interfacing CZ-Si with sol-gel based silica coatings improves the bandgap emission significantly by introducing random strain fields; such results have been reported in several publications and presentations in the literature. The reported work clearly modeled the emission band by a combination of uncorrelated electron-hole and phonon three particle process. In this work, we report an enhancement in carrier recombination from p-Si photoluminescence that is unorthodoxly dominated by correlated carrier recombination resulting in photons of energy hυ with intensity of spectral form ε1/2 associated with correlated carrier recombination, where ε = hυ − EB + Eexc + ETO, EB is the band gap, Eexc is the exciton binding energy, and ETO is the transverse optical phonon energy. This work presents photoluminescence, XRD and imaging results and present the computational proof of electron-hole correlated carriers' recombination.
10:45 AM Cancelled
Trigger Shape Recovery in a Polyurethane with Methanol, Ethanol and 1-propanol: Molecular Mobility, Solubility and Switching Temperatures: Yucen Shen1; Hakan Dumlu1; Klaus Neuking1; Gunther Eggeler1; 1Ruhr University Bochum
In the present work we studied the chemical actuation of a polyurethane type of shape memory polymer triggered by the three solvents methanol, ethanol and 1-propanol. Using weight gain experiments to study how solvent concentration increases with time. Diffusion coefficients are numerically calculated from the weight gain data. The results show that molecular mobilities and saturation concentrations decrease as the size and the weight of molecules increase. The switching temperature only depends on the concentration of solvent not on its chemical nature. This suggests that a critical level of hydroxyl groups, which is the common feature of the three polymers, is solely responsible for chemical actuation. Further, the FT-IR was used to investigate the changes of hydrogen-bond interaction within the chemical actuation process.
11:05 AM
Nanosized Cadmium Selenide Thin Coatings for Possible Utilization in Optoelectronics: Ikhazuagbe Ifijen1; Bala Anegbe2; 1Rubber Research Institute of Nigeria; 2Federal University, Oye-Ekiti, Nigeria
The performance of energy conversion and storage technologies such as solar cells, supercapacitors, and batteries is the subject of a lot of research. Cadmium selenide (CdSe) thin films are appropriate for the next generation of chalcogenide-based photovoltaic and electrochemical energy storage systems because of their narrow bandgap and high absorption coefficient in the visible range, as well as their low electrical resistivity. This paper provided a concise background on the chemical synthesis of CdSe nanoparticles as well as information on the film properties generated at temperatures that are reproducible, effective, and affordable for optoelectronics applications. Due to the band gaps, which were established by many evaluated studies, being adequately located in the visible solar energy region, these CdSe thin films are suitable for electrochemical energy storage systems, such as in solar energy harvesting.
11:25 AM Concluding Comments