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The Influence of Heat Treatment and Mechanical Work on the Lifetimes of Positrons in Fe, Pd and Pd–H

The influence of annealing temperature and stretching with external forces on lifetimes of positrons in Fe, Pd and Pd-H0.05 was investigated. It was found that in all of the examined cases the best fitting of the obtained spectrum of lifetimes of positrons to the theoretical model can be achieved with the assumption that the spectra consist of two components of lifetimes τ1 and τ2 and intensities I1 and I2, respectively. In rolled Fe and Pd, at a high degree of cold work, all the positrons annihilate from the trapping state in two types of defects of clearly different lifetimes. It was observed that dislocations in Fe become active in temperatures exceeding 923 K and in Pd—above 623 K. Deformation through one-axis stretching of Fe, Pd and PdH0.05 within the range of proportional elastic stresses, causes a decrease in lifetimes of positrons in defects of larger sizes. A hysteresis of component τ2 was observed at returning from the stressed state to the free one. Within the range of plastic deformations, changes in the long life component of the spectrum of positron lifetimes correlate with the changes in the length resulting from stretching with external forces.