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 rapidly heating and rapidly quenching method for the manufacturing of multifilamentary Nb3Al wire was introduced, which can obtained Nb3Al with the near stoichiometric composition. After annealing at 800 ℃ for 2, 12 and 96 h, critical temperature Tc of the samples measured by four probe method is 17 K. Critical curreds Ic was measured in the function of temperature and applied field in a split pair magnet. The relationship of normalized pinning force vs applied field follows simple Kramer equation. Grain boundaries were most probable pinning source for the magnetic line of force. The obtained upper critical field Bc2 existed a linear relation with the temperature. A critical surface of Ic - T - B was also plotted from the measurement of critical current.
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