POSITRON LIFETIME ANALYSIS OF DISLOCATIONS ARISING FROM TENSILE STRAIN

Aluminium samples in the form of single crystals were treated by uniax ial tensile strain, so that dislocations were practically the sole typ e of defect produced. A positron lifetime study of these samples, carr ied out at different dislocation densities, and in a wide temperature range, gives information about the mechanism of positron trapping, inc luding trapping rates, binding energy and the development of defect de nsity with deformation and applied stress.