A study for superconducting wires of composite materials having lightweight and good formability properties

采用三维熔透与半固态铸造相结合的方法，将金属粉末复合超导材料MgB2与铝、镁、锌合金复合制备超导导线，该超导材料具有轻质、可成形性好等特点。测量的电阻率表明，从复合材料中切割出的所有样品在25 ~ 39k之间都有明显的超导转变信号。磁滞回线表明，在镁基体（MgB2/Mg-Al-Zn）中同时掺杂Al和Zn可以提高临界电流密度。成功地从MgB2/Al复合坯料中挤出了直径为1.0 mm的超导导线。

The three-dimensional penetration method combined with semi-solid casting was used to fabricate superconducting wires from metal-powder composite superconducting materials of MgB2 with aluminum, magnesium, and zinc alloys, having lightweight and good formability properties.Measured electrical resistivity showed a clear signal of superconducting transition between 25 and 39 Kfor all the samples cut out from the composites. A magnetic hysteresis loop indicated that simultaneously doped Al and Zn to magnesium host-matrix （MgB2/Mg-Al-Zn) enhanced the critical current density. A superconducting wire of a diameter of 1.0 mm was successfully extruded from the composited billet of MgB2/Al.