Abstract
An experiment has been carried out to demonstrate that the orientation relationship between subgrains can be deduced from dark-field microscopy. When a specimen is tilted in dark field with a g vector perpendicular to the tilting axis, contrast reversal occurs between neighboring subgrains if they are joined by a simple twist boundary parallel to g, or by a simple tilt boundary perpendicular to g. It is also shown that the tilt and twist components of a mixed boundary can be determined quantitatively by repeating the tilting experiment with different g vectors. The precision of this method and its advantages and disadvantages for quantitative studies of low-angle boundaries are evaluated from various considerations.
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