KILOCYCLE DAMPING IN PURIFIED IRON BETWEEN 77 K AND 300 K

Abstract

Studies of damping in electron beam zone purified iron indicate that there is no low temperature dislocation relaxation peak such as is found in most other materials. It was found that a modulus defect could be induced by high amplitude oscillations. This is shown to be due to dislocations which have been displaced from equilibrium positions. The activation energy for dislocation motion is estimated to be no higher than .07 e.v. and possible as low as .01 e.v. The amplitude dependent damping was studied as a function of temperature, applied magnetic field, and mechanical state. The Granato-Lucke theory of dislocation damping was found not to apply under the conditions met in this study.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1963
Accession Number
AD0407721

Entities

People

  • Herbert D. Guberman

Organizations

  • Columbia University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Amplifiers
  • Amplitude
  • Crystal Lattices
  • Crystal Structure
  • Crystals
  • Domain Walls
  • Heat Treatment
  • Internal Friction
  • Low Temperature
  • Magnetic Fields
  • Magnetic Phenomena
  • Magnetic Properties
  • Materials
  • Measurement
  • Mechanical Working
  • Oscillation
  • Resonant Frequency

Readers

  • Materials Science and Engineering.
  • Plasma Physics / Magnetohydrodynamics

Technology Areas

  • Directed Energy
  • Microelectronics
  • Microelectronics - Microelectromechanical Systems