Abstract
Electron microscope has a very large depth of focus and this character is very suitable for the study of microstructure of fractured surfaces of metals. Neverthless, very few electronmicroscopical studies of fracture of metals have been reported until now. This is due to the difficulty of obtaining faultless replica of fractured surfaces. We removed this difficulty by adopting an improved methylmethacrylate-Al replica. In this method, the first step replica of polymethylmethacrylate-Al is obtained by dissolving away the metal substance by dilute acid, and next Al on this first step replica rotated during the procedure is evaporated. By this method satisfactory replicas of fracture surfaces of metals were obtained.
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