Twinning dislocations in aluminum.

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Author
Hornbeck, Parker Britten
Date
1966-05Advisor
Clark, John R.
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Show full item recordAbstract
Precession patterns taken with carefully monobromated radiation
show that stacking faults are present in aluminum crystals grown by
the strain anneal method. The evidence for the stacking faults are
the streaks through some diffraction peaks, the variation in structure
factors, Fhkl, as determined from the relative intensities, and the
doubling of some peaks. Arguments are advanced, on geometrical
grounds, that if stacking faults exist in the crystal they will
combine to produce regions in twin orientation. However, the
absence of systematic "extra- twin diffraction peaks suggests that
the twinned regions are very small. It is suggested that a low
stacking fault energy and the occurrence of stacking faults on all
stacking planes, together with the creation of substructures with
other than twin orientations, explains the absence of large visible
twins.
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