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Characterization of HTS Powders and Components
Published in A. G. Mamalis, D. E. Manolakos, A. Szalay, G. Pantazopoulos, Processing of High-Temperature Superconductors at High Strain Rates, 2019
A. G. Mamalis, D. E. Manolakos, A. Szalay, G. Pantazopoulos
Field ion microscopy is extensively used for investigating the structure of conducting solids, because [2]: The FIM makes possible the study not only of the atomic scale structure of solids but also the surface diffusion of single atoms and their complexes on a smooth surface, as well as the early stages of chemical reactions in metal surfaces.Atom probe FIM is the main tool for 3D analysis of the microstructure and chemical composition of a wide spectrum of commercially available materials.
Surfaces
Published in Gerald L. Schneberger, Adhesives in Manufacturing, 2018
In recent years the atom probe has been developed for the determination of single-atom chemistry. When used in conjunction with the field ion microscope, the atom probe can not only characterize the structural arrangement of individual atoms in a solid surface, but also determine the chemistry of an individual atom present in the surface.
Nickel partitioning in ZnNi coatings (Ni less than 4 wt.%) and its effect on the coating corrosion behaviour
Published in Philosophical Magazine, 2023
K. Sai Jyotheender, Manu Mathai, Surendra Kumar Makineni, Chandan Srivastava
ESEM QUANTA 200 scanning electron microscope (SEM) with an operating voltage of 25 kV was used for imaging the surface morphology. Elemental composition was determined using the energy-dispersive X-ray spectroscope (EDS) coupled with the SEM. Bruker D8 Advance diffractometer with Cu Kα as X-ray source was used to collect X-ray diffraction (XRD) profiles. Atom probe tomography (APT) was conducted using LEAP 5000XR. The instrument was operated in laser pulsing mode at a repetition rate of 125 kHz, with 40 pJ of pulse energy for field evaporation. The base temperature was maintained at 70 K with a detection rate of 0.4%. The APT specimen was prepared using Thermofisher SCIOS2 by following the standard protocol [18,19]. The data reconstruction and analysis were performed using the IVASTM3.8.4 software.
Redistribution of substitutional alloying elements between α-Fe matrix and cementite after long-term tempering in a low alloying steel
Published in Philosophical Magazine, 2022
Zhiquan Zhang, Bangxin Zhou, Jun-an Wang, Wenqing Liu
Needle-like specimens for atom probe analysis were prepared by the standard two-step electropolishing method [31] and were analysed using laser mode on a LEAP 4000 HR. The data collected by APT was reconstructed and analysed by IVASTM 3.6.8, where the mass spectra corresponding to C+, C2+, C+2, C+3, C2+3, Fe+, Fe2+, Cu+, Cu2+, Mn+, Mn2+, Ni+, Ni2+, Si+, Si2+, Mo2+, Mo3+, MoC2+ and MoC3+ were deconvolved. For the mass spectra peaks of 58Ni+ and 58Fe+, 29Ni2+ and 29Fe2+ overlapped, which made it complicated to calculate the respective content for Fe and Ni, both kind of peaks were designated as Fe by considering that the nominal content of Fe was much higher than Ni. Obviously, this calculation simplification makes the Ni content slightly underestimated.
Micro-mechanical investigation about degradation of grain boundary cohesive strength of neutron-irradiated stainless steels
Published in Journal of Nuclear Science and Technology, 2022
Terumitsu Miura, Katsuhiko Fujii, Koji Fukuya, Hitoshi Seto
Neutron-irradiated cold-worked 316 stainless steels, which were harvested from FTTs and a BFB (and all used in PWRs), were examined. The final cold work and average grain size were 15% and 10 µm for the FTTs [28] and 20% and 74 µm for the BFB [3]. The chemical compositions and irradiation conditions are shown in Tables 1 and 2, respectively; the materials are designated for example as FTT-12 and BFB-19, indicating the component abbreviation and dose in the present study. The results of microstructure observations, GB compositional analyses, hardness measurements and IASCC tests for the neutron-irradiated FTTs and BFB have been reported elsewhere [3,11]. Frank loops, black dots, cavities and gamma prime (γ’) precipitates were confirmed by TEM observations. Enrichment of Ni and Si and depletion of Fe, Cr and Mo at GBs were detected. Segregation of solute atoms as solute clusters was also detected by atom probe tomography [29].