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Nanocrystallisation by planetary ball-milling of high purity elemental titanium (Ti) revealed a polymorphic transformation from its normal hexagonal close packed (hcp) structure to a face-centered cubic (fcc) phase. Positron lifetime measurements were carried out on samples collected after different hours of milling to characterize the defect structures at grain surfaces. With increasing hours of...
Positron lifetime and Doppler broadening measurements on highly overpressurised (P~10P eq ) helium bubbles in Al indicated abnormal variations at low temperatures, which is being assigned to the transformation of dense helium bubbles into the solid phase, as expected from the Simon-Glatzel equation. The bubble pressure calculated using separate models for the fluid and solid phases shows...
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