Field Emission Microscopy of an Allotropic Transformation:α−βTitanium

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Abstract
The field emission microscope has been applied to a study of the allotropic transformation in single microcrystals of titanium. Patterns with symmetry characteristic of the high and low temperature phases are presented. Techniques for analyzing the patterns are outlined. Data derived from the pattern analyses give an orientation relation between patterns of the two phases that is consistent with the Burgers relation. The field emission microscope thus constitutes a new method for direct observation of phase changes. At the same time, it offers to the study of allotropic transformations the advantages of high resolution and great magnification that are not available with conventional methods.