Defect study on deformed Fe-Si alloys by positron annihilation techniques

Positron annihilation lifetime and coincidence Doppler broadening measurements have been performed on ultra low carbon steel and Fe-Si alloys with different Si contents (from 3.32 up to 11.1 wt%) in the annealed state and after a deformation of 5% thickness reduction. It was seen that above 5.6 wt% Si the nature of the defects trapping the positron changes. This coincides with the concentration for the onset of long range D03 ordering in the Fe-Si alloys changing the nature of the dislocation structure. (copyright 2005 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim) (orig.)