| The mechanism of nucleation of hydrogen blister in metals |
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| 作者姓名： | REN XueChong ZHOU QingJun CHU WuYang LI JinXu SU YanJing QIAO LiJie |
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| 作者单位： | Department of Materials Physics, University of Science and Technology Beijing, Beijing 100083, China |
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| 基金项目： | Supported by the National Natural Science Foundation of China （Grant No. 50471096） |
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| 摘 要： | The nucleating, growing and cracking of hydrogen blister have been investigated experimentally and theoretically. The results show that atomic hydrogen induces superabundant vacancies in metals. The superabundant vacancies and hydrogen aggregate into a hydrogen-vacancy cluster (microcavity). The hydrogen atoms in the microcavity become hydrogen molecules which can stabilize the cluster. And the hydrogen blister nucleates. With the entry of vacancies and hydrogen atoms, the blister nucleus grows and the pressure in the cavity increases. When the stress induced by hydrogen pressure on the blister is up to the cohesive strength, cracks will initiate from the wall of the blister.
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| 关 键 词： | 氢气水泡 成核现象 晶核形成 破裂 裂化 |
| 收稿时间： | 17 January 2007 |
| 修稿时间： | 2007-01-172007-02-12 |
The mechanism of nucleation of hydrogen blister in metals |
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| REN XueChong ZHOU QingJun CHU WuYang LI JinXu SU YanJing QIAO LiJie.The mechanism of nucleation of hydrogen blister in metals[J].Chinese Science Bulletin,2007,52(14):2000-2005. |
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| Authors: | Ren XueChong Zhou QingJun Chu WuYang Li JinXu Su YanJing Qiao LiJie |
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| Institution: | (1) Department of Materials Physics, University of Science and Technology Beijing, Beijing, 100083, China |
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| Abstract: | The nucleating, growing and cracking of hydrogen blister have been investigated experimentally and theoretically. The results show that atomic hydrogen induces superabundant vacancies in metals. The superabundant vacancies and hydrogen aggregate into a hydrogen-vacancy cluster (microcavity). The hydrogen atoms in the microcavity become hydrogen molecules which can stabilize the cluster. And the hydrogen blister nucleates. With the entry of vacancies and hydrogen atoms, the blister nucleus grows and the pressure in the cavity increases. When the stress induced by hydrogen pressure on the blister is up to the cohesive strength, cracks will initiate from the wall of the blister. |
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| Keywords: | hydrogen blister vacancy cluster nucleation cracking |
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