The following purposes were in view at the beginning of the present work: 1. The estimation of the possibility of using the field emission electron microscope for the investigation of phase transformations of pure metals. 2. The elucidation of the significance of the shape and the size of small crystals for the mutual crystallographic orientation of the daughter and the mother phases. 3. The obtaining of regular electron emission patterns of Zr single crystals, because it was known that such patterns had not been obtained until now (1).
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