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扩展．对氢促进位错发射、增殖和运动的原因进行了探讨
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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| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] | |
| [10] | |
| [11] | |
| [12] | |
| [13] | |
| [14] | |
| [15] | |
| [16] | |
| [17] |
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