| Fe3Al氢致开裂和应力腐蚀的TEM原位观察 |
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| 引用本文： | 谷飚,聂一凡,高克玮,褚武扬.Fe3Al氢致开裂和应力腐蚀的TEM原位观察[J].金属学报,1997,33(7):709-717. |
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| 作者姓名： | 谷飚 聂一凡 高克玮 褚武扬 |
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| 作者单位： | 北京科技大学!北京，100083，北京科技大学!北京，100083，北京科技大学!北京，100083，北京科技大学!北京，100083 |
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| 基金项目： | 国家自然科学基金!19392300－6!!59591913 |
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| 摘 要： | 利用恒位移加载台，在ＴＥＭ中原位观察了Ｆｅ３Ａｌ薄膜试样充氢和应力腐蚀前后裂尖位错组态的变化，以及位错对裂纹形核的影响。结果表明，氢能促进裂尖发射位错，促进位错的增殖和运动，并使无位错区增大，当位错发射，运动发展到临界状态时，就会导致氢致裂纹的形核与的扩展。对氢促进位错发射，增殖和运动的原因进行了探讨。
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| 关 键 词： | Fe3Al 氢致开裂 应力腐蚀 TEM |
| 收稿时间： | 1997-07-18 |
| 修稿时间： | 1997-07-18 |
IN SITU TEM OBSERVATION OF HYDROGEN-INDUCED CRACKING AND STRESS CORROSION CRACKING FOR Fe_3Al |
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| GU Biao,NIE Yifan,GAO Kewei,CHU guyana.IN SITU TEM OBSERVATION OF HYDROGEN-INDUCED CRACKING AND STRESS CORROSION CRACKING FOR Fe_3Al[J].Acta Metallurgica Sinica,1997,33(7):709-717. |
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| Authors: | GU Biao NIE Yifan GAO Kewei CHU guyana |
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| Affiliation: | GU Biao,NIE Yifan,GAO Kewei,CHU guyana (University of Science and Technology Beijing,Beijing ) |
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| Abstract: | The change of dislocation configuration ahead of a loaded crack tip before and after charging with hydrogen, and stress corrosion cracking, and relationship between dislocation and initiation of hydrogen-induced cracking (HIC) for Fe3Al are investigated in TEM using a special constant deflection loading device. The results show that hydrogen can enhance dislocation emission, multiplication and motion, and increase the size of dislocation free zone (DFZ). A nanocrack of HIC will initiate and Dropagae in the DFZ when hydrogen enhanced dislocation emission and motion reach a critical condition. The reasons that hydrogen enhanced dislocation emission and motion, and the mechanism of initiation of HIC have been discussed. |
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| Keywords: | Fe3Al hydrogen-enhanced dislocation emission hydrogen-induced crackIng |
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