The structure of MgB_2 filaments and interface areas of in-situ made composite MgB_2/Ti/Cu/Monel wires sintered at temperatures 650-850°C were studied by polarized light optical microscopy and Vickers microhardness. The microhardness can be used for the filament density evolution and also for the sensitive detection of sheath contamination. The temperature dependent MgB_2/Ti and Ti/Cu interface reactions were studied. The presented results give useful information above how the applied composition and annealing can affect the core density, J_c and interface diffusion/reaction.
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机译：通过偏光光学显微镜和维氏显微硬度研究了MgB_2细丝的结构和原位制备的复合MgB_2 / Ti / Cu / Monel线在650-850℃烧结的界面区域。显微硬度可用于细丝密度的演变，也可用于敏感地检测护套污染。研究了温度依赖性的MgB_2 / Ti和Ti / Cu界面反应。所提供的结果在上面提供了有用的信息，如所施加的成分和退火如何影响纤芯密度，J_c和界面扩散/反应。
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