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Twinning dislocations in aluminum.

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Author
Hornbeck, Parker Britten
Date
1966-05
Advisor
Clark, John R.
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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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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.
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http://hdl.handle.net/10945/9662
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    X-ray diffraction patterns from faulted face-centered cubic and diamond cubic crystals 

    Davis, Hugh Miller, Jr. (Monterey, California. U.S. Naval Postgraduate School, 1966-05);
    Calculations have been made in an attempt to predict the effects of microscopically fine twinning and of stacking faults on the x-ray diffraction patterns which can be expected from single crystals of materials having the ...
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    Temper brittleness related to faulting 

    Wood, Frederick (Monterey, California: U.S. Naval Postgraduate School, 1962);
    Temper brittleness was induced in a 3140 steel specimen by means of an isothermal heat treatment in a salt bath, Changes in internal structure of ductile and embrittled specimens were studied using a highprecision X-ray ...
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    Cyclomatic complexity as a utility for predicting software faults 

    Shuman, Edwin Arthur, IV (Monterey, California. Naval Postgraduate School, 1983-06);
    The cyclomatic complexity metric provides a means of quantifying intra-modular software complexity, and its utility has been suggested in the software development and testing process. In this thesis, an empirical analysis ...
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