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用电阻和 X 射线法研究了 Fe_3Al 成分附近4种合金的有序化过程和电阻率温度系数(TCR)随成分的变化规律。结果表明:1)随 Al 含量增加,电阻温度系数(dR/R_(20)~dT)由正值变为负值,说明合金中结合键的价键性增强;2)为实践中得到足够高的有序度的磁致伸缩材料提供了中肯的冷却速度(60℃/h),这样,既能满足性能要求,生产效率又高;3)用电阻法获得的 DO_38型(即 BiLi_3型)有序转变点为 K(?)ster 的结果提供了证明;4)对淬火不能完全抑制FeAl 型有序化给出了解释。
The ordering and the temperature coefficient of resistivity (TCR) of the four alloys in the vicinity of the Fe 3 Al composition were studied by means of electrical resistance and X-ray diffraction. The results show that: 1) As the Al content increases, the temperature coefficient of resistance (dR / R_ (20) ~ dT) changes from positive value to negative value, indicating that the valence bond of the bond in the alloy is enhanced; 2) Of the order of the magnetostrictive material provides a fair cooling rate (60 ℃ / h), so that not only meet the performance requirements, high productivity; 3) obtained by the resistance of the DO_38 type (ie BiLi_3 type) there Order transition point for the K (?) Ster results provide proof; 4) on the quenching can not completely inhibit FeAl-type ordering gives an explanation.