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Study of sintering processes in copper and nickel by positron annihilation
Author(s) -
Krause R.,
Schatt W.,
Vetter B.,
Polity A.
Publication year - 1990
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170250715
Subject(s) - sintering , isothermal process , vacancy defect , positron annihilation , annihilation , nickel , materials science , copper , coincidence , alloy , metallurgy , thermodynamics , condensed matter physics , positron , physics , nuclear physics , medicine , alternative medicine , pathology , electron
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 dislocations takes place. Hence, in conformity with recent experiments, coincidence of intensive material transport ( \documentclass{article}\pagestyle{empty}\begin{document}$ \dot \varepsilon $\end{document} e‐maximum) and decrease of defect concentration (recovery) can be understood.