Chemisorption-facilitated dislocation emission and motion, and induced nucleation of brittle nanocrack
Using a special TEM constant deflection device, the change in dislocation configuration ahead of a loaded crack tip before and after adsorption of Hg atoms and the initiation of liquid metal-induced nanocracks (LMIC) have been observed. The results show that chemisorption of Hg atoms can facilitate...
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| Published in | Science China. Technological sciences Vol. 40; no. 6; pp. 661 - 669 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
Heidelberg
Springer Nature B.V
01.12.1997
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1674-7321 1006-9321 1869-1900 1862-281X |
| DOI | 10.1007/BF02916852 |
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| Abstract | Using a special TEM constant deflection device, the change in dislocation configuration ahead of a loaded crack tip before and after adsorption of Hg atoms and the initiation of liquid metal-induced nanocracks (LMIC) have been observed. The results show that chemisorption of Hg atoms can facilitate dislocation emission, multiplication and motion. Nanocracks will be initiated in the dislocation-free zone (DFZ) or at the crack tip when chemisorption-facilitated dislocation emission, multiplication and motion reach a critical condition. On the basis of the available experimental evidence concerning liquid metal embnttlement (LME), a new mechanism for this phenomenon is considered. This involves the fact that the decrease in surface energy induced by chemisorption of Hg atoms results in a reduction in the critical stress intensity factors for dislocation emission and the resistance for dislocation motion. On the other hand, the plastic work and KIC will decrease with the decrease in the surface energy. |
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| AbstractList | Using a special TEM constant deflection device, the change in dislocation configuration ahead of a loaded crack tip before and after adsorption of Hg atoms and the initiation of liquid metal-induced nanocracks (LMIC) have been observed. The results show that chemisorption of Hg atoms can facilitate dislocation emission, multiplication and motion. Nanocracks will be initiated in the dislocation-free zone (DFZ) or at the crack tip when chemisorption-facilitated dislocation emission, multiplication and motion reach a critical condition. On the basis of the available experimental evidence concerning liquid metal embnttlement (LME), a new mechanism for this phenomenon is considered. This involves the fact that the decrease in surface energy induced by chemisorption of Hg atoms results in a reduction in the critical stress intensity factors for dislocation emission and the resistance for dislocation motion. On the other hand, the plastic work and KIC will decrease with the decrease in the surface energy. Using a special TEM constant deflection device, the change in dislocation configuration ahead of a loaded crack tip before and after adsorption of Hg atoms and the initiation of liquid metal-induced nanocracks (LMIC) have been observed. The results show that chemisorption of Hg atoms can facilitate dislocation emission, multiplication and motion. Nanocracks will be initiated in the dislocation-free zone (DFZ) or at the crack tip when chemisorption-facilitated dislocation emission, multiplication and motion reach a critical condition. On the basis of the available experimental evidence concerning liquid metal embrittlement (LME), a new mechanism for this phenomenon is considered. This involves the fact that the decrease in surface energy induced by chemisorption of Hg atoms results in a reduction in the critical stress intensity factors for dislocation emission and the resistance for dislocation motion. On the other hand, the plastic work andKIC will decrease with the decrease in the surface energy. |
| Author | 宿彦京 王燕斌 褚武扬 |
| AuthorAffiliation | Department of Materials Physics University of Science and Technology Beijing Beijing 100083 China China |
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| References | J. P. Hirth (BF02916852_CR10) 1982 A. W. Sleeswyk (BF02916852_CR13) 1983 M. J. Kelley (BF02916852_CR2) 1975; 6A J. F. Knott (BF02916852_CR14) 1973 J. A. Kargol (BF02916852_CR4) 1977; 8A B. Gu (BF02916852_CR6) 1995; 32 S. M. Ohr (BF02916852_CR9) 1985; 72 A. R. C. Westwood (BF02916852_CR8) 1971 G. P. Cherepanov (BF02916852_CR11) 1974 D. K. Dewald (BF02916852_CR12) 1989; 3 Y. Zhang (BF02916852_CR7) 1994; 31 G. M. Bond (BF02916852_CR5) 1988; 36 S. P. Lynch (BF02916852_CR3) 1988; 36 M. G. Nicholas (BF02916852_CR1) 1979; 14 |
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| SubjectTerms | aluminum Chemisorption Crack initiation Crack tips dislocation Liquid metal embrittlement LME Nucleation Stress intensity factors Surface chemistry Surface energy TEM |
| Title | Chemisorption-facilitated dislocation emission and motion, and induced nucleation of brittle nanocrack |
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