Diffusion Rate of Carbon in Iron-Cobalt Alloys
Diffusion Rate of Carbon in Iron-Cobalt Alloys
复制标题
铁钴合金中碳的扩散速率
DOI：
10.1103/physrev.62.539
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发表时间：
1942
期刊：
影响因子：
--
通讯作者：
R. Smoluchowski
中科院分区：
文献类型：
--
作者：
R. Smoluchowski
对铁合金中各种转变和反应速率的研究似乎表明，某些元素对碳在铁中的扩散速率有一定的影响。特别值得一提的是，钴表现出明显的加速影响。通过直接测量碳在铁钴合金中的扩散速度，证实了这一结论，并确定了扩散系数的增加。添加4%的钴可使活化能从32,500卡下降。降到3万卡。对应于碳原子浓度为1%时扩散速率几乎增加两倍。在碳含量较高时，钴的加速作用较小。钴的这种性质是不寻常的，特别是考虑到已知的锰和镍对碳的扩散几乎没有影响的事实。
Studies of rates of various transformations and reactions in iron alloys seem to indicate that certain elements have a definite influence on the rate of diffusion of carbon in $\ensuremath{\gamma}$-iron. In particular, cobalt shows a pronounced accelerating influence. By direct measurement of the rate of diffusion of carbon in iron-cobalt alloys this conclusion is confirmed and an increase in the diffusion coefficient established. An addition of 4 percent cobalt decteases the activation energy from 32,500 cal. down to 30,000 cal. corresponding to an almost twofold increase of the diffusion rate at 1 atomic percent carbon concentration. At higher carbon contents the accelerating influence of cobalt is smaller. This property of cobalt is unusual especially in view of the fact that both manganese and nickel are known to have practically no influence on the diffusion of carbon.