| Autor: |
Al’shits, V. I., Darinskaya, E. V., Mikhina, E. Yu., Petrzhik, E. A. |
| Předmět: |
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| Zdroj: |
JETP Letters; 5/25/98, Vol. 67 Issue 10, p832, 7p |
| Abstrakt: |
A large increase in dislocation mobility in Al single crystals in a static magnetic field in the absence of mechanical loading of the samples is observed when a dc electric current of low density ( 10[sup 5] - 10[sup 6] A/m²) is additionally passed through the samples. Apparently, the role of the current reduces to depinning of dislocations from strong pinning centers on the surface of the crystal as a result of surface electromigration of defects. This interpretation is supported by the fact that in samples whose surface is insulated by a layer of lacquer the passage of a current through the volume of the crystal does not change the ordinary dislocation mobility level in a magnetic field. It is hypothesized that surface electromigration of defects, which frees dislocations and unblocks dislocation sources, also plays a key role in the physical mechanism of the long-ago discovered macroplastification of metals upon the passage of an electric current through them. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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