**4.1 Low-temperature dislocation structures**

In **Figure 6**, a bright field TEM image of a commercially pure aluminum single crystal strained up to 22.3% at room temperature at 104�s �<sup>1</sup> strain rate is shown. This figure corresponds to a perpendicular section of the sample with respect to the tensile axis. Dislocations are arranged in a messy way. The subgrain size developed by deformation of this pure metal at room temperature is around 1 micron.
