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为了使 NbTi 50 超导复合线获得高的临界电流密度,我们详细地研究了 NbTi 50合金的熔炼方法,以及冷加工和热处理对临界电流密度的影响。研究结果表明:电弧——壳式熔炼方法所得铸锭可用来制取高临界电流密度的复合线,该工艺简便,原材料消耗少,合金组份均匀;冷加工和热处理是影响 NbTi 50复合线之临界电流密度的重要因素,要使NbTi 50复合线获得高的临界电流密度,冷加工和热处理必须交替进行。我们选择了合适的热处理,冷加工和最终冷变形量,结果使 NbTi 50多芯复合线的最高临界电流密度达3.9～4.1×10~5 A/cm~2(5T,4.2K)。
In order to obtain high critical current density of NbTi 50 superconducting composite wire, we have studied in detail the melting method of NbTi 50 alloy and the influence of cold working and heat treatment on the critical current density. The results show that the ingot obtained by the arc-shell melting method can be used to prepare the composite wire with high critical current density. The process is simple, the consumption of raw materials is low and the alloy composition is even. The cold working and heat treatment are the critical factors that affect the NbTi 50 composite wire Current density of the important factors, to make NbTi 50 composite line to obtain high critical current density, cold work and heat treatment must be alternated. We chose the appropriate heat treatment, cold working and final cold deformation, resulting in NbTi 50 multi-core composite wire maximum critical current density of 3.9 ~ 4.1 × 10 ~ 5 A / cm ~ 2 (5T, 4.2K).