强磁场下Ni-Cu系原子的扩散行为(英文)

Atomic interdiffusion in Ni-Cu system under high magnetic field

采用Cu/Ni/Cu扩散偶研究强磁场对Ni-Cu系原子扩散行为的影响。发现该扩散偶在有、无强磁场条件下退火处理时,Ni-Cu系原子互扩散过程中的互扩散系数随着互扩散区内Ni原子摩尔分数的增加而增加,并且在强磁场条件下退火处理后,所有的互扩散系数均小于相应条件下无磁场处理时的互扩散系数。表明强磁场的施加延迟了Ni-Cu系原子的互扩散行为。分析指出,上述强磁场对原子扩散的延迟行为是通过降低互扩散过程中的频率因子而不是互扩散激活能来实现的。

The effect of high magnetic field on the atomic interdiffusion in Ni-Cu system was studied using the Cu/Ni/Cu diffusion couples. During the atomic interdiffusion in Ni-Cu system, it was found that the interdiffusion coefficients increased with the increase of molar fraction of Ni atoms in the interdiffusion zones when the couples were annealed with or without the magnetic field. It was noted that all corresponding interdiffusion coefficients under the magnetic field are smaller than those without the magnetic field. The results demonstrate that the magnetic field retards the atomic interdiffusion in Ni-Cu system. This retardation is achieved through reducing the frequency factors but not changing the interdiffusion activation energies.