Strain Amplitude Dependent Internal Damping Effects In Aluminum And Magnesium Single Crystals [Thesis]
Thesis/Dissertation
·
OSTI ID:4311955
- Carnegie Inst. of Technology, Pittsburgh, PA (United States)
Internal damping and relative Young’s modulus measurements were made of single crystals of four nines pure aluminum and magnesium and single crystals of zone refined aluminum in the kilocycle range. Particular attention was placed on strain amplitude dependent effects; measurements were made from room temperature to 400°C at strain amplitudes from 10-7 to 10-5 and as a function of thermal and mechanical history. Time dependent effects were studied in some detail, and a correlation was made with these effects and certain anomalies in the amplitude dependent behavior. The amplitude dependent effects were described in terms of the pinned dislocation model of Granato and Lücke. It was concluded that this model can explain the above findings if it is assumed that the active dislocation density is of the order of 1/10 to 1/100 of the total dislocation density. It is believed that the time dependent effects can be attributed to the redistribution of the point-type imperfection atmosphere surrounding the dislocations.
- Research Organization:
- Carnegie Inst. of Technology, Pittsburgh, PA (United States)
- Sponsoring Organization:
- US Atomic Energy Commission (AEC); National Carbon Company
- NSA Number:
- NSA-12-000284
- OSTI ID:
- 4311955
- Report Number(s):
- NYO--7828
- Country of Publication:
- United States
- Language:
- English
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