Journal
SCRIPTA MATERIALIA
Volume 60, Issue 3, Pages 137-140Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2008.09.011
Keywords
Aluminium alloys; Positron annihilation; Phase transformation kinetics; Hardness; Vacancy-solute complexes
Categories
Funding
- ANPCyT [PID N0435/2003, PICT Ndegrees12-14376/2004]
- CICPBA, SECAT - UNCentro (Argentina)
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Small additions of Ag and Mg stimulate nucleation of the Omega phase in artificially aged Al-Cu alloys, after which these elements segregate to the Omega/matrix interfaces. In this work, positron spectroscopy results show that vacancies accompany the Ag (and Mg) atoms at the interface during precipitate formation, after which they are released back into the matrix and facilitate secondary ageing at ambient temperature. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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