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Dislocation Tunneling in Plastically Deformed Aluminum

Published online by Cambridge University Press:  10 February 2011

Eunjoo Thompson  and
R. O. Pohl
Eunjoo Thompson
Affiliation:
Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, NY 14853-2501, pohl@msc.cornell.edu
R. O. Pohl
Affiliation:
Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, NY 14853-2501, pohl@msc.cornell.edu
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Abstract

We have measured the amplitude dependent internal friction (ADIF) and sound velocity down to 0.065 K of a 99.9999% (6N) aluminum that was plastically deformed by 1%. The strain amplitude was varied from ε = 1 × 10−8 to ε = 6 × 10−7, a factor of 60. It is observed that with increasing strain amplitude, both the internal friction and the sound velocity become temperature independent over an increasingly wider temperature range. ADIF measurements show a flattening of the temperature dependence of the strain amplitude at low temperatures which is taken to be strong evidence for dislocation tunneling.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 562: Symposium L – Polycrystalline Metal & Magnetic Thin Films , 1999 , 183
Copyright
Copyright © Materials Research Society 1999

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References

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