## Abstract In the advanced stage of nonβisothermal sintering, vacancy clusters are present as prevailing type of defects. Their concentration considerably decreases at further temperature increase, and it can be concluded that thermally activated conversion of multiple vacancies into climbable dis
Studies of voids in heavily neutron damaged nickel by positron annihilation
β Scribed by S. Nanao; K. Kuribayashi; S. Tanigawa; M. Doyama
- Publisher
- Elsevier Science
- Year
- 1975
- Weight
- 198 KB
- Volume
- 18
- Category
- Article
- ISSN
- 0025-5416
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The clustering of vacancies occurring during the isochronal and isothermal annealing treatments of a 40% cold-worked nickel has been investigated through positron lifetime measurements. The observed variation in lifetime has been quantitatively understood by modelling the defect reactions amongst va
Relaxation processes in polyethylene (PE) and polystyrene (PS) were studied by positron annihilation technique. For PE, above the glass transition temperature, T,, the size of free volumes and its concentration were increased by the micro-Brownian motion of molecules. For PS, local motions of molec