Quantitative measurements in in situ straining experiments in transmissionelectron microscopy

Several examples of recent studies by in situ straining experiments in a tr ansmission electron microscope performed in the Toulouse group (France) are presented. In particular, quantitative measurements of the features of the dislocation motion are described. These examples deal with individual or c ollective propagation of dislocations, which are submitted to various types of obstacle. Different metallic materials are investigated: magnesium, int ermetallics, aluminium alloys and gamma phase of a superalloy.