Abstract
Using in situ transmission electron microscopy, we have observed nucleation, propagation and deflection of cracks in a molybdenum thin film. According to characterization by high-resolution transmission electron microscopy, the crack surfaces have a zigzag morphology and are parallel to the {1 1 2} twinning planes that correspond to different twin variants. {1 1 2} de-twinning in association with cracking is also suggested. These observations demonstrate a twin-crack relation whereby (a) twins nucleate cracks and define a preferred cracking path and (b) a propagating crack facilitates twinning.
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