Twinning dislocations in aluminum.
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Authors
Hornbeck, Parker Britten
Subjects
Advisors
Clark, John R.
Date of Issue
1966-05
Date
Publisher
Monterey, California. U.S. Naval Postgraduate School
Language
en_US
Abstract
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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Thesis
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Distribution Statement
Approved for public release; distribution is unlimited.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.