A5015299234- Superconductivity in MgB2 and Alloys
- Physics of Superconductivity and Magnetism
- Iron-based superconductors research
- Aluminum Alloy Microstructure Properties
- Electromagnetic Effects on Materials
- Metallurgical Processes and Thermodynamics
- Aluminum Alloys Composites Properties
- Magnesium Alloys: Properties and Applications
- Magnetic Properties of Alloys
- Advanced Photocatalysis Techniques
- Copper-based nanomaterials and applications
- Advanced materials and composites
- Intermetallics and Advanced Alloy Properties
- Solidification and crystal growth phenomena
- Acoustic Wave Resonator Technologies
- TiO2 Photocatalysis and Solar Cells
- Boron and Carbon Nanomaterials Research
- Metallurgy and Material Forming
The Open University
2022-2024
Brunel University of London
2014-2018
Engineering and Physical Sciences Research Council
2014-2015
MgB2 in bulk form shows great promise as trapped field magnets (TFMs) an alternative to (RE)BCO materials replace permanent applications such rotating machines, magnetic bearings and separation, the relative ease of fabrication has enabled a number different processing techniques be developed. In this paper, comparison is made between samples fabricated by hot isostatic pressing (HIP), with without Ti-doping, infiltration growth (IG) methods highest IG-processed sample, Bz = 2.12 at 5 K 1.66...
The grain boundaries in superconducting MgB2 are known to form effective magnetic flux pinning sites and, consequently, bulk containing a fine-grain microstructure fabricated from nanoscale Mg and B precursor powders exhibits good field-trapping performance below 20 K. We report here that the trapped field of superconductors by an infiltration growth process yield dense, pore-free microstructure, can be enhanced significantly carbon-doping, which increases intra-band scattering within...
The wetting of boron with liquid magnesium is a critical factor in the synthesis MgB2 bulk superconductors by infiltration and growth (IG) process. Poor characteristics can therefore result potentially non-uniform infiltration, formation defects final sample structure poor structural homogeneity throughout material. Here we report fabrication near-net-shaped modified precursor (MPIG) technique. A homogeneous microstructure has subsequently been achieved via uniform Mg enriching pre-reacted...
We report the processing of dense, superconducting MgB2 (ρ ≈ 2.4 g cm−3) by an infiltration and growth technique. The process, which involves liquid magnesium at 750 °C into a pre-defined boron precursor pellet, is relatively simple, results in formation hard, dense structure has potential to fabricate large bulk samples complex geometries. X-ray diffraction been used confirm presence primary phase with only residual content fully processed samples. exhibit sharp transitions 38.4 K have...
The effect of electropulsing on the microstructure formation in solidification mould flux has been investigated. Experimental characterization and image analysis reveals that treatment reduces 46% porosity increases interfacial perimeter to area ratio by 100%. latter provides strong evidence electric current influences energy. Dendrite arm spacing is reduced considerable. Electropulsing promotes anisotropic crystal growth retards interconnected network. favourable flow, liquid refilling...
Abstract The study reports phase and microstructural evolution in MgB 2 bulk superconductors fabricated by an infiltration growth ( IG ) process. Three distinct stages, (1) intermediate boride formation, (2) liquid Mg infiltration, (3) layer were identified process after detailed examination of series samples prepared with varied heating conditions. B 25 , isomorphous to β‐boron, was detected prior formation stage (1). Due volume expansion involved 1, cracks formed the β‐boron particles...
The microstructure of slag film solidified on the inner wall mold in continuous casting low carbon steel has been examined experimentally and analyzed theoretically. A puzzle for crystallization sequence solved by this work, which is useful to guide modification efficient advanced steels. experiments observed three crystalline bands, each containing an initial block-shaped crystal sub-band late-developed dendrite sub-band. grain size morphology change monotonically across layers form a...
Superconducting MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> has been synthesized successfully by a modified infiltration and growth (IG) technique. The ambient pressure technique is relatively simple scalable to complex shaped bulks. extent of phase formation found be influenced strongly the IG process time and/or temperature, this reflect in X-ray diffraction patterns, magnetization measurements, microhardness. Scanning electron...
Application of pulsed electric current to solidifying conductive materials leads a rapid and significant reduction surface roughness. This is validated experimentally in the present work for multi-component oxides. The geometry casts without with pulsating treatment was measured using Leica DCM-3D Profiler. reduces roughness solidified by more than 50%. unmeasurable points, which account nearly 2% total area, were interpolated an artificial multi-layer neural network. Both network profile...
Systematic characterization for the relationship between electropulse processing conditions and microstructure has been carried out in present work. It is found that can refine porosity alter grain morphology considerably. A with optimum electropulsing parameters reduce over 75% volume fraction of more than 70% average pore diameter comparison reference sample without electric treatment. Electric current treatment promotes growth dendrites smaller thickness primary arms dendrite prevents...