Calculation of positron annihilation characteristics in fatigue damaged type 304 stainless steel
We have calculated the Doppler broadening profile of positron annihilation in fatigue damaged type 304 stainless steel using the primary methods. The Doppler broadening profile for the non-damaged and the damaged sample was modeled on the profile for the perfect lattice and the point defect (vacancy),respectively. We used the Wigner-Seitz approximation for the perfect lattice, and the jellium model with the Thomas-Fermi approximation and the mixed density approximation for the point defect. The Doppler broadening profile was calculated for the damaged and the non-damaged samples, and the difference was evaluated. The result agrees with the experiment.
KeywordsFatigue Radioactive Isotope
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