ANOMALOUS AMPLITUDE DEPENDENT DISLOCATION DAMPING ASSOCIATED WITH ANHARMONIC OSCILLATIONS OF A COULOMBIC KINK CHAIN IN THE NONLINEAR DISSIPATIVE ATMOSPHERE OF IMPURITY ATOMS

Date

1991-11-16

Author

OGURTANI, TO

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The effects of the anharmonic interaction of the Coulombic kink chain on the strength and the position of the cold-work internal friction peaks associated with the nonlinearly power dissipating impurity atoms are investigated by a novel numerical simulation of the related discrete mathematical macro-model. The present macroscopic model of dislocation damping which relies heavily on the microscopic theory of kink-interstitial interactions shows very strong anomalous strain amplitude as well as the bias stress dependence of internal friction peaks in accord with the experimental observations. Also it is deduced that the strength of pinning of the kinks at the ends of the chain can have profound influence on the strength and the position of the dislocation damping peaks.

Subject Keywords

Electronic, Optical and Magnetic Materials, Condensed Matter Physics

URI

https://hdl.handle.net/11511/63682

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Department of Metallurgical and Materials Engineering, Article