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介绍了一种快速加热快速冷却制备接近化学计量比的Nb3A1极细多芯线材的方法用四探针法测定试样的临界温度为17K，用Splitpair型磁体测试了试样随温度和磁场变化的临界电流．归一化后的单位体积钉扎力与所加磁场符合Kramer方程，晶界为可能的磁力线钉扎源由临界电流得到的上临界磁场与温度呈线性关系，外推得到临界温度的计算值与实测值基本一致．通过临界电流与温度和磁场的关系得到了Ic-T-B三维临界界面
A rapid heating and rapid cooling method for preparation of Nb3A1 very fine multi-core wire with approximate stoichiometry The critical temperature of the sample is determined by the four-probe method to be 17K. The sample is tested with a splitpair-type magnet for changes in temperature and magnetic field Critical current. The normalized unit volume pinning force and the applied magnetic field are in accordance with the Kramer equation, and the grain boundary is a possible magnetic field. The upper critical magnetic field obtained by the critical current has a linear relationship with the temperature, and the calculated critical temperature and The measured values are basically the same. By the relationship between the critical current and temperature and magnetic field Ic-T-B three-dimensional critical interface