Abstract
[100] Zone electron diffraction patterns from β′ 1-M18R CuZnAl martensite have been examined. Reflections forbidden by the structure factor are found to appear in this pattern. It is argued that an earlier structural model proposed by Delaey and Warlimont to account for similar reflections is inadequate. Instead, it is proposed that the reflections could appear by double diffraction via Higher Order Laue Zone reflections without requiring any changes in the M18R structure for the martensite.
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