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Study of clustering of vacancies in cold-worked nickel by positron annihilation spectroscopy

✍ Scribed by C. S. Sundar; A. Bharathi; K. P. Gopinathan

Publisher
John Wiley and Sons
Year
1987
Tongue
English
Weight
188 KB
Volume
22
Category
Article
ISSN
0232-1300

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✦ Synopsis

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 vacancies leading to the formation of vacancy clusters.

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## Abstract In the advanced stage of non‐isothermal 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