In attempts to increase density and improve connectivity, powder-in-tube MgB2 monofilamentary strands were prepared and then subjected to various pressure schedules. The strands were subjected to cold deformation processes such as cold uniaxial pressing and cold rolling, as well as hot uniaxial pressing at various pressures. It was seen that porosity was reduced in the hot pressed samples, although cracking due to the deformation procedure could be seen. Increases in transport properties were noted, with the 5 T, 4.2 K transport Jc of a sample deformed under 458 MPa (HP3) achieving a value of 1.81×105 A/cm2, compared to a value 0.86×105 A/cm2 for the undeformed strand. SiC doped strands were also tested and analyzed. The transport critical current, Jc, values of all the samples were intercompared to analyze the effect of various pressing conditions. Microstructural changes occurring due to different pressure and temperature schedules were also investigated using scanning electron microscopy.
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机译：在尝试增加密度和改善连通性时，制备粉末管MGB2单丝股线，然后进行各种压力调度。对氏链进行冷变形方法，如冷单轴压制和冷轧，以及各种压力的热单轴压制。可以看出，在热压样品中孔隙率降低，尽管可以看到由于变形程序引起的破裂。注意到运输性质的增加，5吨，4.2k输送Jc在458MPa（HP3）下变形的样品，其值为1.81×105a / cm2，而未变形的值为0.86×105a / cm 2相比Strand。还测试并分析了SiC掺杂的股线。传输临界电流，JC，所有样品的值都是对分析各种压制条件的影响。还使用扫描电子显微镜研究了由于不同的压力和温度调度而发生的微观结构变化。
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