Cyclic Softening of the High-strength Steel HT780 Studied by Positron Annihilation Spectroscopy

Positron Annihilation Spectroscopy

Positron annihilation spectroscopy is nowadays well recognised as a powerful tool of microstructure investigations of condensed matter. An overview of the method aimed for users from other fields is given and supplemented with several examples of applications.

Structure of dislocations in Al and Fe as studied by positron-annihilation spectroscopy.

Effect of carbon on copper precipitation in deformed Fe-based alloys studied by positron annihilation spectroscopy

The role of deformation-induced defects and carbon addition on the copper precipitation during aging at 550 o C is investigated in high-purity Fe-Cu-B-N-C alloy samples by Coincidence Doppler Broadening. In samples with 0% and 8% cold pre-strain, the influence of tensile pre-deformation on the precipitation kinetics of copper is studied. The deformationinduced defects are found to enhance the C...

Vacancy-impurity pairs in relaxed Si1−xGex layers studied by positron annihilation spectroscopy

Positron annihilation spectroscopy was applied to study relaxed P-doped n-type and undoped Si1−xGex layers with x up to 0.30. The as-grown SiGe layers were found to be defect free and annihilation parameters in a random SiGe alloy could be represented as superpositions of annihilations in bulk Si and Ge. A 2 MeV proton irradiation with a 1.6 1015 cm−2 fluence was used to produce saturated posit...

Titanium-Rich Precipitate Evolution in Vanadium-based Alloys Studied by TEM and Positron Annihilation Spectroscopy