Journal
PHILOSOPHICAL MAGAZINE
Volume 89, Issue 13, Pages 1095-1110Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786430902889674
Keywords
age-hardenable alloys; precipitation; transmission electron microscopy; positron annihilation spectroscopy
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Funding
- Agencia Nacional de Promocion Cientifica y Tecnologica [PICT 2006-1650, PID 2003-0435]
- Comision de Investigaciones Cientificas de la Provincia de Buenos Aires and Secretaria de Arte
- Ciencia y Tecnologia (UNCentro), Argentina
- Agencia Nacional de Promocion Cientifica y Tecnologica, Argentina [PICT 2003-RED 301]
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Transmission electron microscopy and positron annihilation spectroscopy techniques were used to characterise the microstructure of the 2024 Al-Cu-Mg commercial alloy artificially aged with and without pre-deformation. In non-deformed samples, a very dense dispersion of small, needle-shaped particles, with mean size in the order of the nanometres, was observed homogeneously distributed in the matrix, together with a coarse distribution of S-phase precipitates. In pre-deformed samples, the needle-shape particles were not seen, only a high density of S-phase precipitates nucleated on dislocations. The needle-shaped particles were identified as solute-rich Guinier-Preston-Bagaryatski (GPB) zones by combining coincidence Doppler broadening positron annihilation measurements with TEM imaging. The relationship between the microstructure and measurements of hardness and positron lifetime evolution during artificial ageing is also discussed.
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