Positron lifetime analysis of dislocations arising from tensile strain

Aluminium samples in the form of single crystals were treated by uniaxial tensile strain, so that dislocations were practically the sole type of defect produced. A positron lifetime study of these samples, carried out at different dislocation densities, and in a wide temperature range, gives information about the mechanism of positron trapping, including trapping rates, binding energy and the development of defect density with deformation and applied stress.