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- W2077149934 abstract "Deformation of a crystal involves the motion of dislocations. Since dislocations interact, a short range and at long range, it is basic to understanding plasticity to establish if dislocations move singly or collectively. If deformation involves the collective motion of dislocations how does it manifest itself or equivalently how can it be measured? While a variety of techniques measure the positions of single dislocations before and after a stress is applied to a crystal, giving an average dislocation velocity, these techniques do not related directly to what happens during deformation, that is the collective behavior of dislocations. The mobile dislocation density is measured as follows: Lead-10% indium crystals are deformed at 4.2K, while in a magnetic field in the range H{sub c1} < H < H{sub c2} where H{sub c1} is the lower critical field, H the applied field and H{sub c2} the upper critical field. During deformation changes n the flux are observed; the changes in flux are proportional to the mobile dislocation density. These changes in flux show the following characteristics: When the deformation process changes from elastic to plastic deformation there is a pronounced increase in flux noise, well above the background noise level. In addition superposedmore » on this noise are pronounced bursts of magnetic flux, corresponding to dislocation bursts or avalanches of dislocations. A number of checks establish that these pulses are solely related to dislocations. These include the fact that they are not reproducible in terms of time from test to test, ruling out systematic instabilities in the circuit. Also, they occur when the crystal is unloaded and then reloaded at times, after plasticity is reinitiated, which are inconsistent with any time constant of the circuit. Finally, the measuring circuit shows no instabilities or ringing in this frequency range.« less" @default.
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- W2077149934 date "1995-07-01" @default.
- W2077149934 modified "2023-09-27" @default.
- W2077149934 title "Collective behavior of dislocations" @default.
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- W2077149934 doi "https://doi.org/10.1016/0956-716x(95)00142-i" @default.
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