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Characterization of Porosity in a Laser Sintered MMCp Using X-Ray Synchrotron Phase Contrast Microtomography

Materials Sciences and Applications 2011年第9期2卷 1322-1330页

作者： Emmanuelle Girardin Chiara Renghini jack dyson Vittorio Calbucci Francesca Moroncini Gianni Albertini 不详

Direct Laser Sintering (DSL), a technology enabling the production of dense metal components directly from 3D CAD data, was used for the first time to produce a Metal Matrix Composite (MMCp) based on Al-Si-Cu alloy in view of its application in different fields, in particular for aeronautics. The porosity of the material obtained so was investigated by using optical and electron microscopy and, in particular, X-ray computed microtomography techniques. DSL is a unique technique to produce complex components in an economical way while computed microtomography is a unique technique to evaluate the porosity and pore and cracks distribution in a not destructive way. A near homogeneous distribution of the porosity and pore sizes was observed both comparing different regions of the same specimen and also by comparing different samples obtained by using the same DLS production method. A quantitative analysis of the damage in the composite is also reported.

关键词： Metal Matrix Composite Direct Laser Sintering X-Ray Synchrotron Computed Microtomography Porosity

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Flux Pinning in Y- and Ag-Doped MgB<sub>2</sub>

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Advances in Materials Physics and Chemistry 2015年第10期5卷 426-438页

作者： jack dyson Daniele Rinaldi Gianni Barucca Gianni Albertini Simone Sprio Anna Tampieri SIMAU Università Politecnica delle Marche Ancona Italy Institute of Science and Technology for Ceramics National Research Council Faenza Italy

High temperature superconductor research is presently concentrated upon the flux pinning properties of the Abrikosov lattice of the mixed-mode superconducting phase. The temperature thermal fluctuations, current and magnetic field unpin the flux vortices and so cause electromagnetic resistivity in high temperature superconductors. Materials with higher vortex pinning exhibit less resistivity and are more attractive for industrial uses. In the present article, we measured and correlated the pinning flux energy barrier, determined by AC magnetic measurements, and transmission electron microscopy measurements to the critical current Jc in Yttrium- and Silver-doped MgB2 superconductors. The energy of the flux vortex was evaluated as a function of the magnetic field. The energy barrier curves suggest an optimal doping level to occur in doped materials. This result only depends on the optimal size and distribution of precipitates, and not on their chemical composition. The energy barriers have been compared with that of undoped MgB2 in literature.

关键词： Flux Pinning AC Magnetic Measurements Critical Current Yttrium-Doping Silver-Doping MgB2 Superconductors Transmission Electron Microscopy X-Ray Diffraction

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