一、前言 铌钛超导合金具有较好的H-J_c(外磁场强度-临界电流密度)特性,便于加工,机械强度好,并可以获得较高的超导稳定性,所以应用很普遍。 在超导合金的T_c(临界温度),H_c(临界磁场强度)和J_c(或H-J_c)三个临界特性中,T_c和H_c是组织不敏感或次敏感特性。H-J_c特性是组织敏感特性,它受冷加工及脱溶的影响。因此,对一定组分的合金,H-J_c特性是它的主要超导性能指标。 当电流超过J_c时,磁通发生跳跃,合金从超导态转变为正常态。冷加工及脱溶处理 First, the preface Niobium titanium superconducting alloy has good properties of H-J_c (external magnetic field strength - critical current density), easy to process, good mechanical strength, and can obtain high superconductivity stability, so the application is very common. Among the three critical properties of Tc (critical temperature), Hc (critical magnetic field) and Jc (or H-Jc) of superconducting alloys, Tc and Hc are tissue-insensitive or sub-sensitive characteristics. The H-J_c property is a tissue-sensitive property that is affected by cold working and desolvation. Therefore, for certain components of the alloy, H-J_c characteristic is its main superconducting performance index. When the current exceeds J_c, the magnetic flux jumps and the alloy changes from the superconducting state to the normal one. Cold processing and solution treatment