Influence of particle shape anisotropy and ductility under uniaxial force during fabrication on the structure of polycrystalline MgB2 superconductors

초록

Polycrystalline materials for use in research and industry are often fabricated using powder filling and forming techniques. Since the resulting structures formed through powder-based fabrication depend on particle properties (e.g., size, shape, and ductility), a deeper understanding of the effects of these properties is essential for advancing material development. We focus on the shape anisotropy of particles and its influence on MgB2 materials in this study. Anisotropic particles are obtained by microscopic deformation of ductile Mg that occurs during mechanical mixing. The use of deformed particles with anisotropic shapes positively impacts the mass density of MgB2 materials. The anisotropic particles also tend to align roughly in a preferred direction during material processing under a uniaxial force. This alignment tendency can be utilized to control the void orientation induced by anisotropic particles in polycrystalline materials. These results provide insights into how particle shape anisotropy and ductility affect the material structure formed through powder-based fabrication. The structural findings presented here will be useful in developing various powder-based materials, including polycrystalline MgB2 superconductors.

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