METHOD FOR EDGE-ON TEM-OBSERVATION OF COLD-ROLLED AL FOILS

A preparation technique is described which allows thin cold rolled foi ls of Aluminium to be observed edge-on by transmission electron micros copy. It consists of glueing a number of foils into a pack of sufficie nt height and stability to be sectioned and thinned by ion milling. A foil rolled to 6.5 mu m thickness contains only about 15 (sub)grains a cross its thickness. The spacing of large angle grain boundaries indic ates that the generation of grain boundary area by deformation is coun teracted during severe rolling by grain boundary recombination.