Application of the critical voltage effect to the study of ordering in alloys

Abstract
Calculated values have been obtained for the critical voltage (V c) of several ordered alloys as a function of degree of long-range order (S). Most systems have a reflection showing a critical voltage within the range of the microscope used (220–650 kV) but the variation with S is generally predicted to be very small. Experiments on Cu2Au and Ni4Mo further indicate that the critical voltage effect is not useful for obtaining new information about the early stages of ordering transformations.