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The slip line pattern and the active slip systems at the top face of [941] and [110] molybdenum single crystals deformed in tension at room temperature are investigated by optical microscopy, surface replica and surface transmission electron microscopy. The latter technique allows to observe simultaneously slip traces and subsurface dislocation structure. Optical microscopy is shown to be insufficient for the characterization of the slip line pattern. The applicability of surface slip traces to obtain information on the activity and slip geometry of dislocations in the bulk crystals is critically discussed.
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Luft et al. (1973) studied this question.
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