クラッド・チップ押出し法と急熱・急冷変態法によるＮｂ３Ａｌ線材の作製とその超伝導特性

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  • Fabrication of Nb3Al Wires by the Clad-Chip Extrusion Method and the Rapid-Heating, Quenching and Transformation Treatment and Their Superconducting Properties

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This paper describes a fabrication process of Nb3Al intermetallic compound wires and measurements of their superconducting properties. Nb3Al superconducting wires are successfully fabricated by the combined process of the clad-chip extrusion (CCE) method and the rapid-heating, quenching and transformation (RHQT) treatment. The CCE method is a processing of Nb/Al composite wire with fine-layered structure, which is characterized by the extrusion of thin chips of clad-rolled Nb/Al sheet. Its chemical composition is controlled by the thickness ratio of the Nb-layer to the Al-layer at clad-rolling. The RHQT treatment is a heat-treatment to convert the Nb/Al composite into Nb3Al, which can produce fine grain structure of Nb3Al intermetallic compound with nearly stoichiometric composition. It is favorable for upgrading the superconducting properties.<BR>The critical transition temperature and the critical current density are enhanced by optimizing the microstructure of the CCE-processed precursor wire and the transformation condition in the RHQT process. Plastic working of the bcc supersaturated solid solution wire after rapid-heating and quenching is found to be effective for enhancing the critical current density in high magnetic field.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 68 (9), 629-635, 2004

    公益社団法人 日本金属学会

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