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镍中磁畴在应力作用下的转动可以引起一个内耗峰(当内耗表示为温度的函数时),是众所周知的现象。最近在我们的实验室中发现镍中含碳可以引起内耗峰。本文叙述进一步的实验,确切证明这个新内耗峰与镍的磁性无关,而与镍中固溶体所含的溶解碳量有关。关于激活能的较精确测量指出:与这个内耗峰相联系的激活能确与碳在镍中扩散的激活能很相近。这些实验说明这个新内耗峰是由于碳在镍中的应力感生微扩散而起的。简单地讨论了这个内耗峰的机构,认为可能与镍的晶体点阵中的空穴有关。It is well-known that the stress-induced rotation of the magnetic domains in nickel gives rise to an internal friction peak (when internal friction is plotted as a function of temperature of measurement). An internal friction peak associated with the presence of carbon in nickel was recently observed in our laboratory. In this paper are described further experiments which demonstrate conclusively that this new internal friction peak is not connected with ferromagnetism of nickel but depends upon the amount of carbon in solid solution in nickel. More accurate determinations of the activation energy associated with this internal friction peak show that this activation energy is indeed very close to the activation energy for the diffusion of carbon in nickel. These experiments thus show that the new internal friction peak is associated with the stress-induced micro-diffusion of carbon in nickel.A brief discussion on the mechanism of this internal friction peak in terms of the existence of holes in the crystal lattice of nickel is given.
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