Microstructure and Superconductive Property of MgB2/Al Composite Materials

Manabu Mizutani; Daisuke Tokai; Kenji Matsuda; Katsuhiko Nishimura; Tokimasa Kawabata; Yoshimitsu Hishinuma; Shigeki Aoyama

doi:10.4028/www.scientific.net/MSF.706-709.667

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HomeMaterials Science ForumMaterials Science Forum Vols. 706-709Microstructure and Superconductive Property of...

Microstructure and Superconductive Property of MgB₂/Al Composite Materials

Abstract:

MgB₂ has the higher critical temperature of superconducting transition (T_C : 39K) among the intermetallic compound superconductive materials, however, MgB₂ is hard for practical use because of its unworkable and lower critical current density (J_C) in a high magnetic field than Nb-based superconductive materials. We have developed the original method of three-dimensional penetration casting (3DPC) to fabricate the MgB₂/Al composite materials. In the composite material we made, MgB₂ particles dispersed to the matrix uniformly. Thus, these composite materials can be processed by machining, extrusion and rolling. The T_C was determined by electrical resistivity and magnetization to be about 37～39K. In this work, we made composite material with ground MgB₂ particle with the purpose of extruding thinner wires of composite material, successfully produced φ1mm wire and changed the matrix from pure Al to Al-In alloy. J_C of composite materials with the matrix of Al-In alloy was calculated from the width of the magnetic hysteresis based on the extended Bean model. The result was better than that of MgB₂/Al composite material without Indium. Microstructures of these samples had been confirmed by SEM observation.

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Materials Science Forum (Volumes 706-709)

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667-670

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.706-709.667

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Online since:

January 2012

Authors:

Manabu Mizutani, Daisuke Tokai, Kenji Matsuda, Katsuhiko Nishimura, Tokimasa Kawabata, Yoshimitsu Hishinuma, Shigeki Aoyama

Keywords:

Aluminum (Al), Composite Material, Critical Current Density, MgB₂, Superconductive Wire, Superconductor

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