| 氢在α-Fe中的扩散及其氢陷阱效应的研究 | |
| 杨柯 | |
| Subtype | 博士 |
| Thesis Advisor | 师昌绪 |
| 1989 | |
| Degree Grantor | 中国科学院金属研究所 |
| Place of Conferral | 中国科学院金属研究所 |
| Abstract | 本文首先针对当前氢在金属中的扩散系数数据的分散性，提出一个处理氢在金属中的扩散及其陷阱效应的简化模型。该模型在利用原有在理想条件下给出的氢扩散方程解的基础上，排除了金属样品中存在的各种氢陷阱的影响，可以准确地得到氢在金属样品晶格中的扩散系数。利用这一简化模型本文求出了氢在α-Fe晶体中的扩散系数在室温附近的表达式，并对α-Fe中存在的氢陷阱效应进行了研究。在此之后本文针对氢在金属样品中的表观扩散系数随氢渗透时间的增加而增大的实验事实，从微观角度出发首次提出了氢在金属中的扩散系数依赖于金属中的氢浓度的氢扩散模型。通过对所提出的氢扩散模型的数值求解，分别得到了两种假设条件下的理论氢渗透曲线。最后又将氢扩散模型应用到几个氢渗透实验结果中，获得了比较满意的结果。 |
| Other Abstract | In the first part of the paper, in view of the data scatters of hydrogen diffusion coefficient in metals, a simplified model was developed which can be used to deal with the diffusion of hydrogen in metals and the corresponding phenomenon of hydrogen trapping. Based on the solution of hydrogen diffusion equation deduced from the ideal condition, the simplified model, in which the effect of hydrogen trapping in metals is completely eliminated, can be used to get the lattice diffusion coefficient of hydrogen in metals more accurately. By use of this simplified model the expression of the lattice diffusion coefficient of hydrogen in α-iron in the vicinity of room temperature was obtained, and the trapping of hydrogen in α-iron was also studied. In the second part of the paper, in view of the experiment fact that the apparent diffusion coefficient of hydrogen in metals increases with the increase of the hydrogen permeation time, a model in which hydrogen diffusion coefficient is dependent on the hydrogen concentration was first developed to describe the diffusion of hydrogen in metals. From the numerical solution of the hydrogen diffusion model newly developed the theoretical hydrogen permeation curves under the two supposed conditions, i.e., the normal hydrogen trapping dynamics and the local equilibrium assumption of hydrogen trapping, were obtained, respectively. Finaly, by the application of the hydrogen diffusion model to the hydrogen permeation experiment results, a well satisfied result was achieved and the corresponding hydrogen trapping parameters were also obtained. |
| Pages | 122 |
| Language | 中文 |
| Document Type | 学位论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/17429 |
| Collection | 中国科学院金属研究所 |
| Recommended Citation GB/T 7714 | 杨柯. 氢在α-Fe中的扩散及其氢陷阱效应的研究[D]. 中国科学院金属研究所. 中国科学院金属研究所,1989. |
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